# Mineral Hardness Color Transparency Crystal System Probability See More
1Chromite5.5BlackTranslucent, OpaqueIsometric0.04
2Arsenic3.5Tin-white, tarnishing to dark grey or black.OpaqueTrigonal0.027
3Augite5.5 - 6.0Brown-green, black, green-black, brown, purplish brownTranslucent, OpaqueMonoclinic0.023
4Chamosite3.0Green, grey-green, blackMonoclinic0.022
5Caryopilite3.0 - 3.5Brown, reddish-brown, tanMonoclinic0.02
6Skutterudite5.5 - 6.0Tin-white to silver-gray, gray (tarnished)OpaqueIsometric0.018
7Kaersutite5.0 - 6.0Dark brown to blackMonoclinic0.017
8Edenite5.0 - 6.0White, grey, pale to dark green, also brown and pale pinkish-brownMonoclinic0.017
9Chalcopyrite3.5 - 4.0Brass yellow, often with an iridescent tarnish.OpaqueTetragonal0.014
10Mottramite3.0 - 3.5Grass-green, olive-green, yellow-green, siskin-green, blackish brown, nearly blackTransparent, OpaqueOrthorhombic0.014
11Metacinnabar3.0Isometric0.014
12Marcasite6.0 - 6.5Pale brass-yellow, tin-white on fresh exposures.OpaqueOrthorhombic0.014
13Stibarsen3.0 - 4.0White, reddish gray, tarnishes grayOpaqueTrigonal0.011
14Whiteite-(CaFeMg)4.0Pink-brown, light brownMonoclinic0.01
15Freibergite3.5 - 4.0GreyOpaqueIsometric0.009
16Nickelskutterudite5.5 - 6.0Tin white - silver greyOpaqueIsometric0.009
17Safflorite4.5 - 5.0Tin-white, tarnishing to dark greyOpaqueOrthorhombic0.009
18Voltaite3.0 - 3.5Green to greenish-black, oil-green to pale green in transmitted light.OpaqueIsometric0.009
19Nickeline5.0 - 5.5Pale copper redOpaqueHexagonal0.009
20Hedenbergite5.5 - 6.5brownish green, blackTransparent, OpaqueMonoclinic0.009
21Pyrrhotite3.5 - 4.0Bronze brown, bronze red, or dark brownOpaqueMonoclinic0.008
22Dufrenite3.5 - 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.0.008
23Hetaerolite6.0Black, reddish-blackOpaqueTetragonal0.008
24Uraninite5.0 - 6.0Black, brownish-black, greyish, greenish, green-gray (thin fragments)OpaqueIsometric0.007
25Famatinite3.0 - 4.0Deep pinkish brownOpaqueTetragonal0.007
26Britholite-(Ce)5.5Brown, greenish brown, yellow, resin brown, black.Hexagonal0.007
27Luzonite3.5Deep pinkish-brownOpaqueTetragonal0.006
28Magnesioferrite5.5 - 6.5Black, grey in reflected light.OpaqueIsometric0.006
29Todorokite1.5Purplish gray, brown to black, brown in transmitted lightOpaqueMonoclinic0.006
30Tetrahedrite3.5 - 4.0Steel- to iron-grayOpaqueIsometric0.006
31Chalcophanite2.5Iron-black, bluish black, dark red (in thin plates)Transparent, OpaqueTrigonal0.005
32Lazurite5.0 - 5.5ultramarine, midnight blue, bluish green, greenOpaqueIsometric0.005
33Cryptomelane5.0 - 6.5Brown, grayish-whiteOpaqueMonoclinic0.005
34Diopside5.5 - 6.5light to dark green, blue, brown, colourless, snow white, grey, pale violetTransparent, OpaqueMonoclinic0.005
35Hauerite4.0Reddish-brown/blackOpaqueIsometric0.005
36Chiavennite3.0Pale orange-yellowMonoclinic0.005
37Alabandite3.5 - 4.0Iron black, brown, greyish black, green, dull brown (tarnished)OpaqueIsometric0.004
38Nontronite1.5 - 2.0Green, olive-green, yellow-green, yellow, orange, brownMonoclinic0.004
39Thorianite6.5 - 7.0Dark grey, brown-blackIsometric0.004
40Clinoatacamite3.0Green to dark greenish-black, greenish-blue.Monoclinic0.004
41Tennantite3.0 - 4.5Grey-black, steel-gray, iron-gray, blackOpaqueIsometric0.004
42Galena2.5Lead-greyOpaqueIsometric0.004
43Clinohumite6.0Monoclinic0.004
44Pyrite6.0 - 6.5Pale brass-yellowOpaqueIsometric0.004
45Johannsenite6.0blue-green, grey-white, dark brown, colourlessMonoclinic0.003
46Lollingite5.0 - 5.5Steel gray to silver white0.003
47Bournonite2.5 - 3.0Steel-grayOpaqueOrthorhombic0.003
48Arsenopyrite5.5 - 6.0Silver-white to steel-gray, may have a slight yellow appearanceOpaqueMonoclinic0.003
49Colusite3.0 - 4.0Bronze, pinkish bronzeOpaqueIsometric0.003
50Aikinite2.0 - 2.5Blackish lead-greyOpaqueOrthorhombic0.003
51Platinum4.0 - 4.5Steel grey to dark greyOpaqueIsometric0.003
52Davidite-(La)6.0BlackTrigonal0.003
53Ilmenite5.0 - 6.0Iron black or blackOpaqueTrigonal0.003
54Fluoro-richterite5.0 - 6.0Brown to brownish-red, rose-red, yellow, grey-brown, also pale to dark green.Monoclinic0.003
55Magnetite5.5 - 6.5Greyish black or iron blackOpaqueIsometric0.003
56Manganite4.0gray-black, blackOpaqueMonoclinic0.003
57Tripuhyite6.0 - 6.5Yellowish brown, lemon-yellow, brown-blackTranslucent, OpaqueTetragonal0.003
58Pyrolusite2.0 - 6.5Black or very dark grey.OpaqueTetragonal0.003
59Lead1.5Grey, but often coated with white hydrocerussite or related phasesOpaqueIsometric0.003
60Antimony3.0 - 3.5Tin-whiteOpaqueTrigonal0.003
61Enargite3.0Greyish-black to black, grey/rose-brown in reflected light.OpaqueOrthorhombic0.003
62Hauyne5.5 - 6.0Blue, white, grey, yellow, green, pink.0.002
63Milarite6.0Hexagonal0.002
64Bismuth2.0 - 2.5Reddish-white to creamy-white, tarnishes iridescent pinkish, yellowish or bluishOpaqueTrigonal0.002
65Arseniosiderite4.5Golden-yellow to yellow-brown, reddish-brown, brown, black, reddish brown to brownish yellow in transmitted light..OpaqueMonoclinic0.002