# Mineral Hardness Color Transparency Crystal System Probability See More
1Kintoreite4.0Cream to yellowish green and brownish yellow.TransparentTrigonal0.023
2Plumbojarosite1.5 - 2.0Golden-brown to dark-brown, dark brown-red, blackishTranslucent, OpaqueTrigonal0.023
3Tetrawickmanite3.5 - 4.5Honey-yellow, brown-orangeTransparent, TranslucentTetragonal0.019
4Lepidocrocite5.0Deep red, red-brownTransparentOrthorhombic0.015
5Cyrilovite4.0Bright yellow, honey-yellow, orange to brownish yellow, brownTranslucentTetragonal0.012
6Beudantite3.5 - 4.5Black, dark green, brown, dark yellow, red, greenish yellow, brownTransparent, TranslucentTrigonal0.011
7Murdochite4.0BlackOpaqueIsometric0.011
8Descloizite3.0 - 3.5Brownish red, red-orange, reddish brown to blackish brown, nearly blackTransparent, TranslucentOrthorhombic0.011
9Jarosite2.5 - 3.5Amber-yellow, yellow-brown, to brown or light yellow.TranslucentTrigonal0.011
10Pyrope7.5Blood red, orange red, purple red, pink, black red, colorless.Isometric0.01
11Ice1.5Colourless to white, pale blue to greenish blue in thick layersTransparent, TranslucentHexagonal0.01
12Hollandite4.0 - 6.0Silvery-grey to greyish black, blackOpaqueMonoclinic0.009
13Iron4.5Iron-blackOpaqueIsometric0.008
14Siderite3.5 - 4.5Yellowish-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.TranslucentTrigonal0.008
15Goethite5.0 - 5.5brownish black, yellow-brown, reddish brownOpaqueOrthorhombic0.008
16Segnitite4.0Greenish to yellowish-brownTransparent, TranslucentTrigonal0.008
17Quartz7.0Colorless, purple, rose, red, black, yellow, brown, green, blue, orange, etc.Transparent, TranslucentTrigonal0.007
18Santarosaite3.0vivid blue0.007
19Vigezzite4.5 - 5.0Orange-yellowOrthorhombic0.007
20Mottramite3.0 - 3.5Grass-green, olive-green, yellow-green, siskin-green, blackish brown, nearly blackTransparent, OpaqueOrthorhombic0.006
21Todorokite1.5Purplish gray, brown to black, brown in transmitted lightOpaqueMonoclinic0.006
22Xanthoconite2.0 - 3.0Red-orange, yellow-orange, red-brown, brownTranslucentMonoclinic0.006
23Bariopharmacosiderite2.5Brown, yellow, reddish brown, green, bluishTransparent, TranslucentTetragonal0.006
24Cacoxenite3.0 - 4.0Yellow to brownish yellow, reddish orange, golden yellow, deep orange, green, yellow in transmitted lightTranslucentHexagonal0.006
25Crandallite5.0Yellow, white, gray, colorless in transmitted light.Translucent, OpaqueTrigonal0.006
26Caryopilite3.0 - 3.5Brown, reddish-brown, tanMonoclinic0.005
27Uraninite5.0 - 6.0Black, brownish-black, greyish, greenish, green-gray (thin fragments)OpaqueIsometric0.005
28Thomsonite-Ca5.0 - 5.5Colourless, white, light yellow, light green, pink, brownTransparent, TranslucentOrthorhombic0.005
29Wurtzite3.5 - 4.0Dark reddish-brown to black, orange-brownTranslucentHexagonal0.005
30Pyrolusite2.0 - 6.5Black or very dark grey.OpaqueTetragonal0.005
31Meurigite-K3.0Yellowish brown, cream to white, pale to canary yellowTranslucentMonoclinic0.004
32Greenockite3.0 - 3.5Yellow to red.TranslucentHexagonal0.004
33Dufrenite3.5 - 4.5Dark 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
34Pucherite4.0Reddish brown, dark reddish brown, greenish-brown, orange, yellowish brown, yellow-brown in transmitted lightTransparent, Translucent, OpaqueOrthorhombic0.004
35Pseudoboleite2.5Indigo blue, green-blueTranslucentTetragonal0.004
36Mackayite4.5Pale bottle-green, olive green, brownish green, greenish black, greenish yellow to yellowish green in transmitted light.TransparentTetragonal0.004
37Ferrierite-Mg3.0 - 3.5White, colorless, pinkish, orange to redTransparent, TranslucentOrthorhombic0.004
38Diamond10.0Colourless, yellowish to yellow, brown, black, blue, green or red, pink, champagne-tan, cognac-brown, lilac (very rare)Transparent, Translucent, OpaqueIsometric0.004
39Domeykite3.0 - 3.5Tin white - steel greyOpaqueIsometric0.004
40Rutile6.0 - 6.5Blood red, brownish yellow, brown-red, yellow, greyish-black, black, brown, bluish or violetTransparentTetragonal0.004
41Chalcophanite2.5Iron-black, bluish black, dark red (in thin plates)Transparent, OpaqueTrigonal0.004
42Montgomeryite4.0Dark green to light green, colourless, red, yellowTransparent, TranslucentMonoclinic0.003
43Anhydrite3.0 - 3.5Colourless, bluish, blue-grey, violet, burgundy-red, white, rose-pink, brownish, reddish, grey, dark grey, colourless in transmitted lightTransparent, TranslucentOrthorhombic0.003
44Fluorophlogopite2.0 - 3.0Pale yellow0.003
45Fiedlerite3.5Colourless, white, colourless in transmitted light.TransparentMonoclinic0.003
46Bermanite3.5Reddish-brown, yellowish brown to brownish red with red internal reflections in transmitted lightTransparent, TranslucentMonoclinic0.003
47Delafossite5.5Black, brown-white in reflected lightOpaqueTrigonal0.003
48Spessartine6.5 - 7.5Red, reddish orange, yellowish brown, reddish brown, or brownTransparent, TranslucentIsometric0.003
49Geikielite5.0 - 6.0black, red, brownish blackTranslucent, OpaqueTrigonal0.003
50Nontronite1.5 - 2.0Green, olive-green, yellow-green, yellow, orange, brownMonoclinic0.003
51Hemimorphite4.5 - 5.0Colorless, white, pale blue, pale green, gray, brownTransparent, TranslucentOrthorhombic0.003
52Perovskite5.5Dark brown, black, red-brown, yellow shadesTransparent, TranslucentOrthorhombic0.003
53Almandine7.0 - 7.5Deep red, brownish red, red-violet, blackTransparent, TranslucentIsometric0.003
54Azurite3.5 - 4.0Azure blue, blue, light blue, or dark blue, light blue in transmitted lightTransparent, TranslucentMonoclinic0.003
55Platinum4.0 - 4.5Steel grey to dark greyOpaqueIsometric0.003
56Tyuyamunite1.5 - 2.0Canary yellow, lemon-yellow, greenish yellow (upon exposure to sunlight), colourless to pale yellow in transmitted light.Translucent, OpaqueOrthorhombic0.003
57Corkite3.5 - 4.5Brown to light yellowish brown, pale yellow, yellowish green to dark greenTransparent, TranslucentTrigonal0.003
58Wulfenite2.5 - 3.0Orange-yellow, yellow, honey-yellow, reddish-orange, rarely colourless, grey, brown, olive-green and even black.Transparent, Translucent, OpaqueTetragonal0.003
59Rockbridgeite3.5 - 4.5Dark green, olive-green, brown, yellow-brown, greenish black, blackTranslucent, OpaqueOrthorhombic0.003
60Opal5.5 - 6.5Colourless, white, yellow, red, orange, green, brown, black, blueTransparent, Translucent0.003
61Pickeringite1.5 - 2.0Colourless to white, light yellow, pale pink, gray, colourless in transmitted lightTranslucentMonoclinic0.003
62Aeschynite-(Y)5.0 - 6.0Pale yellow, yellow-orange, pale greenish yellow, black, brownishblackTransparent, TranslucentOrthorhombic0.003
63Calcite3.0White, Yellow, Red, Orange, Blue, Green, Brown, Gray etc.Transparent, TranslucentTrigonal0.003
64Cordierite7.0 - 7.5Grey, blue, blue-violet, greenish, yellowish brown, colourless to very light blue in transmitted light.Transparent, TranslucentOrthorhombic0.003
65Philipsbornite4.5yellow, green or greyTrigonal0.003
66Variscite3.5 - 4.5Pale to emerald-green, bluish green, colourless to white, pale shades of brown or yellow, rarely red, Colourless to pale green in transmitted light.Transparent, TranslucentOrthorhombic0.003
67Pseudobrookite6.0Brownish black, reddish brown, or blackOrthorhombic0.003
68Bastnasite-(Ce)4.0 - 4.5Yellow, reddish-brown, colourless to light yellow in transmitted light0.003
69Cobaltlotharmeyerite4.5light brown to reddish brownMonoclinic0.003
70Realgar1.5 - 2.0Dark red to orange-redTransparentMonoclinic0.003
71Dussertite3.5Green, yellow-green, bluish green, yellowish green in transmitted light.TranslucentTrigonal0.002
72Zemannite2.0BrownHexagonal0.002
73Orientite4.0 - 5.0Light reddish brown, chocolate-brownTransparent, TranslucentOrthorhombic0.002
74Baryte3.0Colourless, white, yellow, brown, grey, blue, etc., colourless in transmitted light (also tinted yellow, brown, green, blue, etc.)Transparent, Translucent, OpaqueOrthorhombic0.002
75Cornetite4.5Dark blue to green-blue, green-blue in transmitted light.Transparent, TranslucentOrthorhombic0.002
76Chalcosiderite4.5dark green to apple-greenTransparentTriclinic0.002
77Triplite5.0 - 5.5Brown, red-brown, dark brown, black (altered), light brownish u=yellow to dark reddish brown in transmitted light.OpaqueMonoclinic0.002
78Hetaerolite6.0Black, reddish-blackOpaqueTetragonal0.002
79Pyroxmangite5.5 - 6.0Pink, red, brownTransparent, TranslucentTriclinic0.002
80Cryptomelane5.0 - 6.5Brown, grayish-whiteOpaqueMonoclinic0.002
81Hinsdalite4.5Colourless, greenish, pearly whiteTransparent, TranslucentTrigonal0.002
82Arseniosiderite4.5Golden-yellow to yellow-brown, reddish-brown, brown, black, reddish brown to brownish yellow in transmitted light..OpaqueMonoclinic0.002
83Lithiophilite4.0Reddish-brown, yellowish brown, golden-yellow, salmon-orange, colourless to light yellow, pink in transmitted light.Transparent, TranslucentOrthorhombic0.002
84Magnesite3.5 - 4.5Colourless, white, greyish-white, yellowish, brown, faintly pink, lilac-rose, colourless in transmitted light.Transparent, TranslucentTrigonal0.002
85Acanthite2.0 - 2.5lead grey, blackOpaqueMonoclinic0.002
86Aragonite3.5 - 4.0Colorless to white or grey, often stained various hues by impurities, such as blue, green, red or violet, colourless in transmitted light.Transparent, TranslucentOrthorhombic0.002
87Chondrodite6.0 - 6.5Yellow, Red or Brown.Transparent, TranslucentMonoclinic0.002
88Mercury2.5Tin whiteOpaqueTrigonal0.002
89Hewettite4.0 - 4.5Deep red, chocolate brown (upon exposure), red to orange in transmitted lightTransparentMonoclinic0.002
90Kaolinite2.0 - 2.5White to cream and pale-yellow, also often stained various hues, tans and browns being common.Translucent, OpaqueTriclinic0.002
91Tschernichite4.5Colourless to whiteTransparent, TranslucentTetragonal0.002
92Selenium2.0Gray to grayish black, reddish gray, redOpaqueTrigonal0.002
93Fornacite2.0 - 3.0Deep olive-green, golden yellow in transmitted light (small grains).TransparentMonoclinic0.002
94Kentrolite5.0Black, sometimes with dark red internal reflectionsTranslucentOrthorhombic0.002
95Dolomite3.5 - 4.0Colourless, white, gray, reddish-white, brownish-white, or pink, colourless in transmitted lightTransparent, TranslucentTrigonal0.002
96Davidite-(La)6.0BlackTrigonal0.002
97Gudmundite5.5 - 6.0OpaqueMonoclinic0.002
98Bismoclite2.0 - 2.5Cream-white, greyish, yellowish brown, colourless in thin sectionTransparent, TranslucentTetragonal0.002
99Hopeite3.5Yellow, white, colourless, grey or brown, colourless in transmitted light.Transparent, TranslucentOrthorhombic0.002
100Petitjeanite4.5White to pale pink or yellow, also dark brownTriclinic0.002