# Mineral Hardness Color Transparency Crystal System Probability See More
1Covellite1.5 - 2.0Indigo-blue or darker, inclining towards blue-black, often iridescent with purplish, deep red, and brassy-yellow reflections.OpaqueHexagonal0.138
2Zinkenite3.0 - 3.5Steel-greyOpaqueHexagonal0.06
3Chalcostibite3.0 - 4.0Lead-gray, iron grayOpaqueOrthorhombic0.048
4Cannizzarite2.0White to silvery grayOpaqueMonoclinic0.038
5Clinoclase2.5 - 3.0Blue, greenish-blue, dark green-black, blue-green in transmitted light.Transparent, TranslucentMonoclinic0.037
6Renierite4.0 - 5.0Orange-bronze, tarnishes reddishOpaqueTetragonal0.027
7Groutite3.5 - 4.0Black, may be iridescentOpaqueOrthorhombic0.022
8Chalcocite2.5 - 3.0Blue black, gray, black, black gray, or steel grayOpaqueMonoclinic0.018
9Magnesioferrite5.5 - 6.5Black, grey in reflected light.OpaqueIsometric0.017
10Bornite3.0Copper-red to pinchbeck-brown, quickly tarnishing to an iridescent purplish surface.OpaqueOrthorhombic0.015
11Stibnite2.0Lead-gray with pale blue tintOpaqueOrthorhombic0.015
12Manganvesuvianite6.0 - 7.0Deep red-brown, red, nearly blackTransparent, Translucent, OpaqueTetragonal0.014
13Clinoatacamite3.0Green to dark greenish-black, greenish-blue.Monoclinic0.014
14Jamesonite2.5Gray-black, iridescent at timesOpaqueMonoclinic0.014
15Atacamite3.0 - 3.5Bright green, dark emerald-green to blackish green, shades of green in transmitted light.Transparent, TranslucentOrthorhombic0.012
16Plumosite2.0 - 3.0grey0.012
17Arsenopyrite5.5 - 6.0Silver-white to steel-gray, may have a slight yellow appearanceOpaqueMonoclinic0.011
18Tetrahedrite3.5 - 4.0Steel- to iron-grayOpaqueIsometric0.011
19Neptunite5.0 - 6.0BlackOpaqueMonoclinic0.011
20Vivianite1.5 - 2.0Colourless and transparent when fresh, quickly turning pale to deep blue, greenish-blue or bluish-green.Transparent, TranslucentMonoclinic0.01
21Berthierite2.0 - 3.0Dark steel-grey, often with iridescent tarnish.OpaqueOrthorhombic0.01
22Azurite3.5 - 4.0Azure blue, blue, light blue, or dark blue, light blue in transmitted lightTransparent, TranslucentMonoclinic0.01
23Hausmannite5.5Brown-blackOpaqueTetragonal0.01
24Manganite4.0gray-black, blackOpaqueMonoclinic0.008
25Chevkinite-(Ce)5.0 - 5.5blackMonoclinic0.008
26Claringbullite2.5 - 3.0Hexagonal0.008
27Plumbojarosite1.5 - 2.0Golden-brown to dark-brown, dark brown-red, blackishTranslucent, OpaqueTrigonal0.008
28Spangolite3.0Dark to emerald green, blue-green, light green in transmitted light.Transparent, TranslucentTrigonal0.008
29Apuanite4.0 - 5.0BlackOpaqueTetragonal0.008
30Hematite5.0 - 6.0Steel-grey to black in crystals and massively crystalline ores, dull to bright "rust-red" in earthy, compact, fine-grained material.OpaqueTrigonal0.007
31Brochantite3.5 - 4.0Green, emerald green, green-black, light green, bluish green in transmitted light.Transparent, TranslucentMonoclinic0.007
32Hubnerite4.0 - 4.5Yellow-brown, reddish-brown, blackish brown, black, red (rare)0.007
33Hutchinsonite1.5 - 2.0Scarlet-vermillion to deep cherry-redOrthorhombic0.007
34Langite2.5 - 3.0Blue, greenish-blueTranslucentMonoclinic0.007
35Cuprite3.5 - 4.0Dark red to cochineal red, sometimes almost black.Transparent, TranslucentIsometric0.006
36Enargite3.0Greyish-black to black, grey/rose-brown in reflected light.OpaqueOrthorhombic0.006
37Bismuthinite2.0 - 2.5Lead gray to tin whiteOpaqueOrthorhombic0.006
38Famatinite3.0 - 4.0Deep pinkish brownOpaqueTetragonal0.006
39Aenigmatite5.5 - 6.0Velvet-blackTranslucent, OpaqueTriclinic0.006
40Pseudoboleite2.5Indigo blue, green-blueTranslucentTetragonal0.005
41Lazulite5.5 - 6.0Blue, sky-blue, bluish whiteTransparent, TranslucentMonoclinic0.005
42Magnetite5.5 - 6.5Greyish black or iron blackOpaqueIsometric0.005
43Cornetite4.5Dark blue to green-blue, green-blue in transmitted light.Transparent, TranslucentOrthorhombic0.005
44Paratacamite3.0Green to greenish-black.TranslucentTrigonal0.005
45Perovskite5.5Dark brown, black, red-brown, yellow shadesTransparent, TranslucentOrthorhombic0.005
46Matlockite2.5 - 3.0Colourless, light yellow to light golden-yellow, greenishTransparentTetragonal0.005
47Posnjakite2.0 - 3.0Sky-blue to dark-blue, may be slightly greenish-blue.Monoclinic0.005
48Ferro-hornblende5.0 - 6.0Dark green to black, greenish-brown, more rarely lighter greenMonoclinic0.005
49Libethenite4.0Light to dark green, blackish green, olive-green, bluish green to light green in transmitted light.Transparent, TranslucentOrthorhombic0.005
50Chalcomenite2.0 - 2.5Intense blue, pale blue in transmitted light.TransparentOrthorhombic0.004
51Pyrargyrite2.5Deep red or red grayTranslucentTrigonal0.004
52Botallackite1.0Mountain-green, bluish green to green, pale bluish green in transmitted lightTransparent, TranslucentMonoclinic0.004
53Hetaerolite6.0Black, reddish-blackOpaqueTetragonal0.004
54Caledonite2.5 - 3.0Dark blue to bluish-green, light bluish green in transmitted light.Transparent, TranslucentOrthorhombic0.004
55Matulaite1.0Monoclinic0.004
56Veszelyite3.5 - 4.0Green, blue, greenish blue, dark blue, greenish blue in transmitted lightTranslucentMonoclinic0.004
57Stephanite2.0 - 2.5Lead gray or blackOpaqueOrthorhombic0.004
58Cumengeite2.5Indigo blueTranslucentTetragonal0.004
59Aegirine6.0Dark green to greenish black, reddish brown, blackTransparent, OpaqueMonoclinic0.004
60Graphite1.0 - 2.0Iron black to steel-greyOpaqueHexagonal0.003
61Keyite2.5blueMonoclinic0.003
62Braunite6.0 - 6.5Brownish black, steel-greyOpaqueTetragonal0.003
63Chalcopyrite3.5 - 4.0Brass yellow, often with an iridescent tarnish.OpaqueTetragonal0.003
64Freieslebenite2.5grey, dark greyOpaqueMonoclinic0.003
65Miargyrite2.5Black with dark red internal reflectionsMonoclinic0.003
66Djurleite2.5 - 3.0Black, gray in reflected lightOpaqueMonoclinic0.003
67Vandenbrandeite4.0Blackish green to dark green with bluish green tintTransparent, TranslucentTriclinic0.003
68Plattnerite5.5Jet-black, iron-black, brownish blackOpaqueTetragonal0.003
69Scainiite3.5 - 4.0Black, bluish metallic with dark red tintOpaqueMonoclinic0.003
70Galenobismutite2.5 - 3.5Lead-gray, gray, light gray, tin-whiteOpaqueOrthorhombic0.003
71Diaboleite2.5BlueTransparentTetragonal0.003
72Paralaurionite3.0Colourless, white, yellow, violet, greenTransparentMonoclinic0.003
73Rheniite4.0Silvery-white, black, red translucentTranslucentTriclinic0.003
74Bermanite3.5Reddish-brown, yellowish brown to brownish red with red internal reflections in transmitted lightTransparent, TranslucentMonoclinic0.002
75Betekhtinite3.0 - 3.5BlackOpaqueOrthorhombic0.002
76Chalcophanite2.5Iron-black, bluish black, dark red (in thin plates)Transparent, OpaqueTrigonal0.002
77Pearceite2.5 - 3.0black with dark red internal reflectionsTrigonal0.002
78Ferberite4.0 - 4.5Black, dark brown in transmitted lightOpaqueMonoclinic0.002
79Wroewolfeite2.5Intense blue-green, bluishTransparent, TranslucentMonoclinic0.002
80Pyrolusite2.0 - 6.5Black or very dark grey.OpaqueTetragonal0.002
81Olivenite3.0Olive green to yellow or brown, gray-green, grayish white, light green in transmitted light.Translucent, OpaqueMonoclinic0.002
82Staurolite7.0 - 7.5Dark brown, brownish-black, red-brownTranslucentMonoclinic0.002
83Ullmannite5.0 - 5.5Tin-white, steel greyOpaqueIsometric0.002
84Polybasite2.5 - 3.0Black with dark ruby red internal reflectionsOpaqueMonoclinic0.002
85Kulanite4.0Blue, blue-green, greenMonoclinic0.002
86Ludwigite5.0Dark-green to blackOpaqueOrthorhombic0.002
87Gaudefroyite6.0Hexagonal0.002
88Glaucophane5.0 - 6.0Grey to lavender-blue.Monoclinic0.002
89Schorl7.0Bluish-black to black, sometimes brownish-black, rarely greenish-black.Translucent, OpaqueTrigonal0.002
90Manganoneptunite5.0 - 6.0RedMonoclinic0.002
91Tennantite3.0 - 4.5Grey-black, steel-gray, iron-gray, blackOpaqueIsometric0.002
92Ilvaite5.5 - 6.0Iron-black, dark grayish blackOpaqueOrthorhombic0.002
93Ilmenite5.0 - 6.0Iron black or blackOpaqueTrigonal0.002
94Scorodite3.5 - 4.0Green, blue-green, grey, grayish-green, blue, yellow-brown, nearly colourless, violet, colourless to faintly greenish or greenish brown in transmitted light.TranslucentOrthorhombic0.002
95Caysichite-(Y)4.5Colourless, white, pale yellow, rarely greenishTransparent, TranslucentOrthorhombic0.002
96Galena2.5Lead-greyOpaqueIsometric0.002
97Marcasite6.0 - 6.5Pale brass-yellow, tin-white on fresh exposures.OpaqueOrthorhombic0.002
98Linarite2.5Deep azure blue, deep blue in transmitted light.Transparent, TranslucentMonoclinic0.002
99Boleite3.0 - 3.5Deep prussian blue to indigo, bluish green in transmitted lightTranslucentIsometric0.002
100Meneghinite2.5Blackish lead-grayOpaqueOrthorhombic0.002