1 | Kintoreite | 4.0 | Cream to yellowish green and brownish yellow. | Transparent | Trigonal | 0.023 | |
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2 | Plumbojarosite | 1.5 - 2.0 | Golden-brown to dark-brown, dark brown-red, blackish | Translucent, Opaque | Trigonal | 0.023 | |
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3 | Tetrawickmanite | 3.5 - 4.5 | Honey-yellow, brown-orange | Transparent, Translucent | Tetragonal | 0.019 | |
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4 | Lepidocrocite | 5.0 | Deep red, red-brown | Transparent | Orthorhombic | 0.015 | |
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5 | Cyrilovite | 4.0 | Bright yellow, honey-yellow, orange to brownish yellow, brown | Translucent | Tetragonal | 0.012 | |
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6 | Beudantite | 3.5 - 4.5 | Black, dark green, brown, dark yellow, red, greenish yellow, brown | Transparent, Translucent | Trigonal | 0.011 | |
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7 | Murdochite | 4.0 | Black | Opaque | Isometric | 0.011 | |
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8 | Descloizite | 3.0 - 3.5 | Brownish red, red-orange, reddish brown to blackish brown, nearly black | Transparent, Translucent | Orthorhombic | 0.011 | |
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9 | Jarosite | 2.5 - 3.5 | Amber-yellow, yellow-brown, to brown or light yellow. | Translucent | Trigonal | 0.011 | |
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10 | Pyrope | 7.5 | Blood red, orange red, purple red, pink, black red, colorless. | | Isometric | 0.01 | |
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11 | Ice | 1.5 | Colourless to white, pale blue to greenish blue in thick layers | Transparent, Translucent | Hexagonal | 0.01 | |
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12 | Hollandite | 4.0 - 6.0 | Silvery-grey to greyish black, black | Opaque | Monoclinic | 0.009 | |
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13 | Iron | 4.5 | Iron-black | Opaque | Isometric | 0.008 | |
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14 | Siderite | 3.5 - 4.5 | Yellowish-brown to greyish-brown, pale yellow to tannish, grey, brown, green, red, black and sometimes nearly colourless, tarnished iridescent at times, colourless to yellow and yellow-brown in transmitted light. | Translucent | Trigonal | 0.008 | |
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15 | Goethite | 5.0 - 5.5 | brownish black, yellow-brown, reddish brown | Opaque | Orthorhombic | 0.008 | |
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16 | Segnitite | 4.0 | Greenish to yellowish-brown | Transparent, Translucent | Trigonal | 0.008 | |
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17 | Quartz | 7.0 | Colorless, purple, rose, red, black, yellow, brown, green, blue, orange, etc. | Transparent, Translucent | Trigonal | 0.007 | |
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18 | Santarosaite | 3.0 | vivid blue | | | 0.007 | |
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19 | Vigezzite | 4.5 - 5.0 | Orange-yellow | | Orthorhombic | 0.007 | |
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20 | Mottramite | 3.0 - 3.5 | Grass-green, olive-green, yellow-green, siskin-green, blackish brown, nearly black | Transparent, Opaque | Orthorhombic | 0.006 | |
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21 | Todorokite | 1.5 | Purplish gray, brown to black, brown in transmitted light | Opaque | Monoclinic | 0.006 | |
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22 | Xanthoconite | 2.0 - 3.0 | Red-orange, yellow-orange, red-brown, brown | Translucent | Monoclinic | 0.006 | |
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23 | Bariopharmacosiderite | 2.5 | Brown, yellow, reddish brown, green, bluish | Transparent, Translucent | Tetragonal | 0.006 | |
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24 | Cacoxenite | 3.0 - 4.0 | Yellow to brownish yellow, reddish orange, golden yellow, deep orange, green, yellow in transmitted light | Translucent | Hexagonal | 0.006 | |
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25 | Crandallite | 5.0 | Yellow, white, gray, colorless in transmitted light. | Translucent, Opaque | Trigonal | 0.006 | |
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26 | Caryopilite | 3.0 - 3.5 | Brown, reddish-brown, tan | | Monoclinic | 0.005 | |
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27 | Uraninite | 5.0 - 6.0 | Black, brownish-black, greyish, greenish, green-gray (thin fragments) | Opaque | Isometric | 0.005 | |
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28 | Thomsonite-Ca | 5.0 - 5.5 | Colourless, white, light yellow, light green, pink, brown | Transparent, Translucent | Orthorhombic | 0.005 | |
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29 | Wurtzite | 3.5 - 4.0 | Dark reddish-brown to black, orange-brown | Translucent | Hexagonal | 0.005 | |
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30 | Pyrolusite | 2.0 - 6.5 | Black or very dark grey. | Opaque | Tetragonal | 0.005 | |
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31 | Meurigite-K | 3.0 | Yellowish brown, cream to white, pale to canary yellow | Translucent | Monoclinic | 0.004 | |
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32 | Greenockite | 3.0 - 3.5 | Yellow to red. | Translucent | Hexagonal | 0.004 | |
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33 | Dufrenite | 3.5 - 4.5 | Dark green, olive-green, olive-brown, black, olive-brown to reddish brown with oxidation, bluish green to reddish brown or yellow in transmitted light. | | | 0.004 | |
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34 | Pucherite | 4.0 | Reddish brown, dark reddish brown, greenish-brown, orange, yellowish brown, yellow-brown in transmitted light | Transparent, Translucent, Opaque | Orthorhombic | 0.004 | |
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35 | Pseudoboleite | 2.5 | Indigo blue, green-blue | Translucent | Tetragonal | 0.004 | |
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36 | Mackayite | 4.5 | Pale bottle-green, olive green, brownish green, greenish black, greenish yellow to yellowish green in transmitted light. | Transparent | Tetragonal | 0.004 | |
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37 | Ferrierite-Mg | 3.0 - 3.5 | White, colorless, pinkish, orange to red | Transparent, Translucent | Orthorhombic | 0.004 | |
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38 | Diamond | 10.0 | Colourless, yellowish to yellow, brown, black, blue, green or red, pink, champagne-tan, cognac-brown, lilac (very rare) | Transparent, Translucent, Opaque | Isometric | 0.004 | |
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39 | Domeykite | 3.0 - 3.5 | Tin white - steel grey | Opaque | Isometric | 0.004 | |
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40 | Rutile | 6.0 - 6.5 | Blood red, brownish yellow, brown-red, yellow, greyish-black, black, brown, bluish or violet | Transparent | Tetragonal | 0.004 | |
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41 | Chalcophanite | 2.5 | Iron-black, bluish black, dark red (in thin plates) | Transparent, Opaque | Trigonal | 0.004 | |
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42 | Montgomeryite | 4.0 | Dark green to light green, colourless, red, yellow | Transparent, Translucent | Monoclinic | 0.003 | |
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43 | Anhydrite | 3.0 - 3.5 | Colourless, bluish, blue-grey, violet, burgundy-red, white, rose-pink, brownish, reddish, grey, dark grey, colourless in transmitted light | Transparent, Translucent | Orthorhombic | 0.003 | |
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44 | Fluorophlogopite | 2.0 - 3.0 | Pale yellow | | | 0.003 | |
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45 | Fiedlerite | 3.5 | Colourless, white, colourless in transmitted light. | Transparent | Monoclinic | 0.003 | |
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46 | Bermanite | 3.5 | Reddish-brown, yellowish brown to brownish red with red internal reflections in transmitted light | Transparent, Translucent | Monoclinic | 0.003 | |
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47 | Delafossite | 5.5 | Black, brown-white in reflected light | Opaque | Trigonal | 0.003 | |
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48 | Spessartine | 6.5 - 7.5 | Red, reddish orange, yellowish brown, reddish brown, or brown | Transparent, Translucent | Isometric | 0.003 | |
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49 | Geikielite | 5.0 - 6.0 | black, red, brownish black | Translucent, Opaque | Trigonal | 0.003 | |
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50 | Nontronite | 1.5 - 2.0 | Green, olive-green, yellow-green, yellow, orange, brown | | Monoclinic | 0.003 | |
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51 | Hemimorphite | 4.5 - 5.0 | Colorless, white, pale blue, pale green, gray, brown | Transparent, Translucent | Orthorhombic | 0.003 | |
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52 | Perovskite | 5.5 | Dark brown, black, red-brown, yellow shades | Transparent, Translucent | Orthorhombic | 0.003 | |
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53 | Almandine | 7.0 - 7.5 | Deep red, brownish red, red-violet, black | Transparent, Translucent | Isometric | 0.003 | |
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54 | Azurite | 3.5 - 4.0 | Azure blue, blue, light blue, or dark blue, light blue in transmitted light | Transparent, Translucent | Monoclinic | 0.003 | |
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55 | Platinum | 4.0 - 4.5 | Steel grey to dark grey | Opaque | Isometric | 0.003 | |
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56 | Tyuyamunite | 1.5 - 2.0 | Canary yellow, lemon-yellow, greenish yellow (upon exposure to sunlight), colourless to pale yellow in transmitted light. | Translucent, Opaque | Orthorhombic | 0.003 | |
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57 | Corkite | 3.5 - 4.5 | Brown to light yellowish brown, pale yellow, yellowish green to dark green | Transparent, Translucent | Trigonal | 0.003 | |
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58 | Wulfenite | 2.5 - 3.0 | Orange-yellow, yellow, honey-yellow, reddish-orange, rarely colourless, grey, brown, olive-green and even black. | Transparent, Translucent, Opaque | Tetragonal | 0.003 | |
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59 | Rockbridgeite | 3.5 - 4.5 | Dark green, olive-green, brown, yellow-brown, greenish black, black | Translucent, Opaque | Orthorhombic | 0.003 | |
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60 | Opal | 5.5 - 6.5 | Colourless, white, yellow, red, orange, green, brown, black, blue | Transparent, Translucent | | 0.003 | |
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61 | Pickeringite | 1.5 - 2.0 | Colourless to white, light yellow, pale pink, gray, colourless in transmitted light | Translucent | Monoclinic | 0.003 | |
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62 | Aeschynite-(Y) | 5.0 - 6.0 | Pale yellow, yellow-orange, pale greenish yellow, black, brownishblack | Transparent, Translucent | Orthorhombic | 0.003 | |
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63 | Calcite | 3.0 | White, Yellow, Red, Orange, Blue, Green, Brown, Gray etc. | Transparent, Translucent | Trigonal | 0.003 | |
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64 | Cordierite | 7.0 - 7.5 | Grey, blue, blue-violet, greenish, yellowish brown, colourless to very light blue in transmitted light. | Transparent, Translucent | Orthorhombic | 0.003 | |
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65 | Philipsbornite | 4.5 | yellow, green or grey | | Trigonal | 0.003 | |
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66 | Variscite | 3.5 - 4.5 | Pale to emerald-green, bluish green, colourless to white, pale shades of brown or yellow, rarely red, Colourless to pale green in transmitted light. | Transparent, Translucent | Orthorhombic | 0.003 | |
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67 | Pseudobrookite | 6.0 | Brownish black, reddish brown, or black | | Orthorhombic | 0.003 | |
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68 | Bastnasite-(Ce) | 4.0 - 4.5 | Yellow, reddish-brown, colourless to light yellow in transmitted light | | | 0.003 | |
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69 | Cobaltlotharmeyerite | 4.5 | light brown to reddish brown | | Monoclinic | 0.003 | |
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70 | Realgar | 1.5 - 2.0 | Dark red to orange-red | Transparent | Monoclinic | 0.003 | |
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71 | Dussertite | 3.5 | Green, yellow-green, bluish green, yellowish green in transmitted light. | Translucent | Trigonal | 0.002 | |
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72 | Zemannite | 2.0 | Brown | | Hexagonal | 0.002 | |
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73 | Orientite | 4.0 - 5.0 | Light reddish brown, chocolate-brown | Transparent, Translucent | Orthorhombic | 0.002 | |
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74 | Baryte | 3.0 | Colourless, white, yellow, brown, grey, blue, etc., colourless in transmitted light (also tinted yellow, brown, green, blue, etc.) | Transparent, Translucent, Opaque | Orthorhombic | 0.002 | |
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75 | Cornetite | 4.5 | Dark blue to green-blue, green-blue in transmitted light. | Transparent, Translucent | Orthorhombic | 0.002 | |
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76 | Chalcosiderite | 4.5 | dark green to apple-green | Transparent | Triclinic | 0.002 | |
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77 | Triplite | 5.0 - 5.5 | Brown, red-brown, dark brown, black (altered), light brownish u=yellow to dark reddish brown in transmitted light. | Opaque | Monoclinic | 0.002 | |
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78 | Hetaerolite | 6.0 | Black, reddish-black | Opaque | Tetragonal | 0.002 | |
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79 | Pyroxmangite | 5.5 - 6.0 | Pink, red, brown | Transparent, Translucent | Triclinic | 0.002 | |
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80 | Cryptomelane | 5.0 - 6.5 | Brown, grayish-white | Opaque | Monoclinic | 0.002 | |
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81 | Hinsdalite | 4.5 | Colourless, greenish, pearly white | Transparent, Translucent | Trigonal | 0.002 | |
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82 | Arseniosiderite | 4.5 | Golden-yellow to yellow-brown, reddish-brown, brown, black, reddish brown to brownish yellow in transmitted light.. | Opaque | Monoclinic | 0.002 | |
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83 | Lithiophilite | 4.0 | Reddish-brown, yellowish brown, golden-yellow, salmon-orange, colourless to light yellow, pink in transmitted light. | Transparent, Translucent | Orthorhombic | 0.002 | |
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84 | Magnesite | 3.5 - 4.5 | Colourless, white, greyish-white, yellowish, brown, faintly pink, lilac-rose, colourless in transmitted light. | Transparent, Translucent | Trigonal | 0.002 | |
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85 | Acanthite | 2.0 - 2.5 | lead grey, black | Opaque | Monoclinic | 0.002 | |
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86 | Aragonite | 3.5 - 4.0 | Colorless to white or grey, often stained various hues by impurities, such as blue, green, red or violet, colourless in transmitted light. | Transparent, Translucent | Orthorhombic | 0.002 | |
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87 | Chondrodite | 6.0 - 6.5 | Yellow, Red or Brown. | Transparent, Translucent | Monoclinic | 0.002 | |
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88 | Mercury | 2.5 | Tin white | Opaque | Trigonal | 0.002 | |
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89 | Hewettite | 4.0 - 4.5 | Deep red, chocolate brown (upon exposure), red to orange in transmitted light | Transparent | Monoclinic | 0.002 | |
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90 | Kaolinite | 2.0 - 2.5 | White to cream and pale-yellow, also often stained various hues, tans and browns being common. | Translucent, Opaque | Triclinic | 0.002 | |
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91 | Tschernichite | 4.5 | Colourless to white | Transparent, Translucent | Tetragonal | 0.002 | |
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92 | Selenium | 2.0 | Gray to grayish black, reddish gray, red | Opaque | Trigonal | 0.002 | |
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93 | Fornacite | 2.0 - 3.0 | Deep olive-green, golden yellow in transmitted light (small grains). | Transparent | Monoclinic | 0.002 | |
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94 | Kentrolite | 5.0 | Black, sometimes with dark red internal reflections | Translucent | Orthorhombic | 0.002 | |
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95 | Dolomite | 3.5 - 4.0 | Colourless, white, gray, reddish-white, brownish-white, or pink, colourless in transmitted light | Transparent, Translucent | Trigonal | 0.002 | |
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96 | Davidite-(La) | 6.0 | Black | | Trigonal | 0.002 | |
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97 | Gudmundite | 5.5 - 6.0 | | Opaque | Monoclinic | 0.002 | |
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98 | Bismoclite | 2.0 - 2.5 | Cream-white, greyish, yellowish brown, colourless in thin section | Transparent, Translucent | Tetragonal | 0.002 | |
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99 | Hopeite | 3.5 | Yellow, white, colourless, grey or brown, colourless in transmitted light. | Transparent, Translucent | Orthorhombic | 0.002 | |
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100 | Petitjeanite | 4.5 | White to pale pink or yellow, also dark brown | | Triclinic | 0.002 | |
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