1 | Fluoro-richterite | 5.0 - 6.0 | Brown to brownish-red, rose-red, yellow, grey-brown, also pale to dark green. | | Monoclinic | 0.046 | |
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2 | Ferro-hornblende | 5.0 - 6.0 | Dark green to black, greenish-brown, more rarely lighter green | | Monoclinic | 0.037 | |
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3 | Corundum | 9.0 | Colourless, blue, red, pink, yellow, grey, golden-brown | Transparent, Translucent, Opaque | Trigonal | 0.032 | |
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4 | Magnesio-hastingsite | 5.0 - 6.0 | Green to brownish-green | | Monoclinic | 0.03 | |
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5 | Britholite-(Ce) | 5.5 | Brown, greenish brown, yellow, resin brown, black. | | Hexagonal | 0.027 | |
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6 | Brannerite | 4.5 - 5.5 | Black, brownish olive-green, yellow-brown to yellow with alteration, yellowish green in transmitted light | Opaque | Monoclinic | 0.024 | |
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7 | Marcasite | 6.0 - 6.5 | Pale brass-yellow, tin-white on fresh exposures. | Opaque | Orthorhombic | 0.024 | |
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8 | Tetrahedrite | 3.5 - 4.0 | Steel- to iron-gray | Opaque | Isometric | 0.021 | |
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9 | Magnetite | 5.5 - 6.5 | Greyish black or iron black | Opaque | Isometric | 0.019 | |
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10 | Tellurium | 2.0 - 2.5 | Tin-white | Opaque | Trigonal | 0.014 | |
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11 | Sylvanite | 1.5 - 2.0 | Grey, white, pale yellow silver-white | Opaque | Monoclinic | 0.013 | |
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12 | Graphite | 1.0 - 2.0 | Iron black to steel-grey | Opaque | Hexagonal | 0.011 | |
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13 | Stannite | 4.0 | Grey, black with an olive-green tint, tarnishes pale blue | Opaque | Tetragonal | 0.01 | |
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14 | Schorl | 7.0 | Bluish-black to black, sometimes brownish-black, rarely greenish-black. | Translucent, Opaque | Trigonal | 0.009 | |
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15 | 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 | 0.008 | |
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16 | Augite | 5.5 - 6.0 | Brown-green, black, green-black, brown, purplish brown | Translucent, Opaque | Monoclinic | 0.008 | |
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17 | Euxenite-(Y) | 5.5 - 6.5 | Black, greenish or brownish tint at times | | Orthorhombic | 0.006 | |
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18 | Ilmenite | 5.0 - 6.0 | Iron black or black | Opaque | Trigonal | 0.006 | |
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19 | Elpidite | 5.0 | Colorless, white, gray, yellowish, orange, brown, beige | Transparent, Translucent, Opaque | Orthorhombic | 0.006 | |
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20 | Epidote | 6.0 | Yellowish-green, green, brownish-green, black | Transparent, Translucent, Opaque | Monoclinic | 0.006 | |
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21 | Stibnite | 2.0 | Lead-gray with pale blue tint | Opaque | Orthorhombic | 0.005 | |
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22 | Diopside | 5.5 - 6.5 | light to dark green, blue, brown, colourless, snow white, grey, pale violet | Transparent, Opaque | Monoclinic | 0.005 | |
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23 | Tantalite-(Mn) | 6.0 | Pink to nearly colourless, reddish brown to black | Opaque | Orthorhombic | 0.004 | |
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24 | Gadolinite-(Y) | 6.5 - 7.0 | Black, greenish-black, brown | Opaque | Monoclinic | 0.004 | |
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25 | Lenoblite | 3.0 | | | Orthorhombic | 0.004 | |
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26 | Cassiterite | 6.0 - 7.0 | Black, yellow, brown, red or white. | Transparent, Translucent, Opaque | Tetragonal | 0.004 | |
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27 | Allanite-(Ce) | 5.5 - 6.0 | Brown to black | Translucent, Opaque | Monoclinic | 0.004 | |
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28 | Gmelinite-Na | 4.5 | Colorles, white, reddish white, salmon-red, yellowish, greenish white | Transparent, Translucent, Opaque | Hexagonal | 0.004 | |
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29 | Boulangerite | 2.5 - 3.0 | Lead grey | Opaque | Monoclinic | 0.004 | |
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30 | Nepheline | 5.5 - 6.0 | White, grey, yellowish | Transparent, Opaque | Hexagonal | 0.003 | |
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31 | Gahnite | 7.5 - 8.0 | Dark blue-green, yellow, brown, black | | Isometric | 0.003 | |
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32 | Meionite | 5.0 - 6.0 | Colorless, white, grey, pink, violet, blue, yellow, orange-brown, brown | Transparent, Opaque | Tetragonal | 0.003 | |
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33 | Pyrite | 6.0 - 6.5 | Pale brass-yellow | Opaque | Isometric | 0.003 | |
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34 | Hematite | 5.0 - 6.0 | Steel-grey to black in crystals and massively crystalline ores, dull to bright "rust-red" in earthy, compact, fine-grained material. | Opaque | Trigonal | 0.003 | |
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35 | Miargyrite | 2.5 | Black with dark red internal reflections | | Monoclinic | 0.003 | |
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36 | Chromite | 5.5 | Black | Translucent, Opaque | Isometric | 0.003 | |
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37 | Platinum | 4.0 - 4.5 | Steel grey to dark grey | Opaque | Isometric | 0.002 | |
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38 | Cobaltite | 5.5 | Reddish silver white, violet steel gray, or black. | Opaque | Orthorhombic | 0.002 | |
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39 | Uraninite | 5.0 - 6.0 | Black, brownish-black, greyish, greenish, green-gray (thin fragments) | Opaque | Isometric | 0.002 | |
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40 | Emplectite | 2.0 | Greyish to tin-white | Opaque | Orthorhombic | 0.002 | |
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41 | Nenadkevichite | 5.0 | Rose-pink, very light pink, light yellow, brown, dark brown due to inclusions | Transparent, Translucent, Opaque | Orthorhombic | 0.002 | |
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42 | Selenium | 2.0 | Gray to grayish black, reddish gray, red | Opaque | Trigonal | 0.002 | |
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43 | Meneghinite | 2.5 | Blackish lead-gray | Opaque | Orthorhombic | 0.002 | |
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44 | Cubanite | 3.5 | Brass- to bronze-yellow | Opaque | Orthorhombic | 0.002 | |
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45 | Beryl | 7.5 - 8.0 | Colorless, green, blue, yellow, white, pink, etc. | | Hexagonal | 0.002 | |
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46 | Davidite-(La) | 6.0 | Black | | Trigonal | 0.002 | |
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47 | Loparite-(Ce) | 5.5 | | | | 0.002 | |
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48 | Babingtonite | 5.5 - 6.0 | Dark greenish-black | Opaque | Triclinic | 0.002 | |
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49 | Bournonite | 2.5 - 3.0 | Steel-gray | Opaque | Orthorhombic | 0.002 | |
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50 | Berthierite | 2.0 - 3.0 | Dark steel-grey, often with iridescent tarnish. | Opaque | Orthorhombic | 0.002 | |
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51 | Bornite | 3.0 | Copper-red to pinchbeck-brown, quickly tarnishing to an iridescent purplish surface. | Opaque | Orthorhombic | 0.001 | |
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52 | Melanophlogite | 6.5 - 7.0 | Colorless, white, water-clear (pale yellow to deep red brown with impurities) | | Tetragonal | 0.001 | |
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53 | Gonnardite | 4.0 - 5.0 | | | Orthorhombic | 0.001 | |
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