# Mineral Hardness Color Transparency Crystal System Probability See More
1Fluoro-richterite5.0 - 6.0Brown to brownish-red, rose-red, yellow, grey-brown, also pale to dark green.Monoclinic0.046
2Ferro-hornblende5.0 - 6.0Dark green to black, greenish-brown, more rarely lighter greenMonoclinic0.037
3Corundum9.0Colourless, blue, red, pink, yellow, grey, golden-brownTransparent, Translucent, OpaqueTrigonal0.032
4Magnesio-hastingsite5.0 - 6.0Green to brownish-greenMonoclinic0.03
5Britholite-(Ce)5.5Brown, greenish brown, yellow, resin brown, black.Hexagonal0.027
6Brannerite4.5 - 5.5Black, brownish olive-green, yellow-brown to yellow with alteration, yellowish green in transmitted lightOpaqueMonoclinic0.024
7Marcasite6.0 - 6.5Pale brass-yellow, tin-white on fresh exposures.OpaqueOrthorhombic0.024
8Tetrahedrite3.5 - 4.0Steel- to iron-grayOpaqueIsometric0.021
9Magnetite5.5 - 6.5Greyish black or iron blackOpaqueIsometric0.019
10Tellurium2.0 - 2.5Tin-whiteOpaqueTrigonal0.014
11Sylvanite1.5 - 2.0Grey, white, pale yellow silver-whiteOpaqueMonoclinic0.013
12Graphite1.0 - 2.0Iron black to steel-greyOpaqueHexagonal0.011
13Stannite4.0Grey, black with an olive-green tint, tarnishes pale blueOpaqueTetragonal0.01
14Schorl7.0Bluish-black to black, sometimes brownish-black, rarely greenish-black.Translucent, OpaqueTrigonal0.009
15Diamond10.0Colourless, yellowish to yellow, brown, black, blue, green or red, pink, champagne-tan, cognac-brown, lilac (very rare)Transparent, Translucent, OpaqueIsometric0.008
16Augite5.5 - 6.0Brown-green, black, green-black, brown, purplish brownTranslucent, OpaqueMonoclinic0.008
17Euxenite-(Y)5.5 - 6.5Black, greenish or brownish tint at timesOrthorhombic0.006
18Ilmenite5.0 - 6.0Iron black or blackOpaqueTrigonal0.006
19Elpidite5.0Colorless, white, gray, yellowish, orange, brown, beigeTransparent, Translucent, OpaqueOrthorhombic0.006
20Epidote6.0Yellowish-green, green, brownish-green, blackTransparent, Translucent, OpaqueMonoclinic0.006
21Stibnite2.0Lead-gray with pale blue tintOpaqueOrthorhombic0.005
22Diopside5.5 - 6.5light to dark green, blue, brown, colourless, snow white, grey, pale violetTransparent, OpaqueMonoclinic0.005
23Tantalite-(Mn)6.0Pink to nearly colourless, reddish brown to blackOpaqueOrthorhombic0.004
24Gadolinite-(Y)6.5 - 7.0Black, greenish-black, brownOpaqueMonoclinic0.004
25Lenoblite3.0Orthorhombic0.004
26Cassiterite6.0 - 7.0Black, yellow, brown, red or white.Transparent, Translucent, OpaqueTetragonal0.004
27Allanite-(Ce)5.5 - 6.0Brown to blackTranslucent, OpaqueMonoclinic0.004
28Gmelinite-Na4.5Colorles, white, reddish white, salmon-red, yellowish, greenish whiteTransparent, Translucent, OpaqueHexagonal0.004
29Boulangerite2.5 - 3.0Lead greyOpaqueMonoclinic0.004
30Nepheline5.5 - 6.0White, grey, yellowishTransparent, OpaqueHexagonal0.003
31Gahnite7.5 - 8.0Dark blue-green, yellow, brown, blackIsometric0.003
32Meionite5.0 - 6.0Colorless, white, grey, pink, violet, blue, yellow, orange-brown, brownTransparent, OpaqueTetragonal0.003
33Pyrite6.0 - 6.5Pale brass-yellowOpaqueIsometric0.003
34Hematite5.0 - 6.0Steel-grey to black in crystals and massively crystalline ores, dull to bright "rust-red" in earthy, compact, fine-grained material.OpaqueTrigonal0.003
35Miargyrite2.5Black with dark red internal reflectionsMonoclinic0.003
36Chromite5.5BlackTranslucent, OpaqueIsometric0.003
37Platinum4.0 - 4.5Steel grey to dark greyOpaqueIsometric0.002
38Cobaltite5.5Reddish silver white, violet steel gray, or black.OpaqueOrthorhombic0.002
39Uraninite5.0 - 6.0Black, brownish-black, greyish, greenish, green-gray (thin fragments)OpaqueIsometric0.002
40Emplectite2.0Greyish to tin-whiteOpaqueOrthorhombic0.002
41Nenadkevichite5.0Rose-pink, very light pink, light yellow, brown, dark brown due to inclusionsTransparent, Translucent, OpaqueOrthorhombic0.002
42Selenium2.0Gray to grayish black, reddish gray, redOpaqueTrigonal0.002
43Meneghinite2.5Blackish lead-grayOpaqueOrthorhombic0.002
44Cubanite3.5Brass- to bronze-yellowOpaqueOrthorhombic0.002
45Beryl7.5 - 8.0Colorless, green, blue, yellow, white, pink, etc.Hexagonal0.002
46Davidite-(La)6.0BlackTrigonal0.002
47Loparite-(Ce)5.50.002
48Babingtonite5.5 - 6.0Dark greenish-blackOpaqueTriclinic0.002
49Bournonite2.5 - 3.0Steel-grayOpaqueOrthorhombic0.002
50Berthierite2.0 - 3.0Dark steel-grey, often with iridescent tarnish.OpaqueOrthorhombic0.002
51Bornite3.0Copper-red to pinchbeck-brown, quickly tarnishing to an iridescent purplish surface.OpaqueOrthorhombic0.001
52Melanophlogite6.5 - 7.0Colorless, white, water-clear (pale yellow to deep red brown with impurities)Tetragonal0.001
53Gonnardite4.0 - 5.0Orthorhombic0.001