Gray rocks & minerals
Gray rocks and minerals are extremely common in the field. Hardness, density, and how the specimen breaks (fracture vs. cleavage) tell you more than color alone.
Showing 361–480 of 862 gray rocks (page 4 of 8).
Horsetail Fossilcommonfossil · Mohs 3-5gray, brown, black
Howlitecommonmineral · Mohs 3.5white, gray, colorless
Humberstoniteraremineral · Mohs 2.5colorless, white, gray
Hyalotekiteraremineral · Mohs 5-5.5white, colorless, gray
Hydroboraciteuncommonmineral · Mohs 4white, colorless, gray
Hydrocerussiteraremineral · Mohs 3.5white, colorless, gray
Hydroglauberiteraremineral · Mohs 2-3colorless, white, gray
Hydrokenomicroliteraremineral · Mohs 5-5.5yellow, brown, colorless
Hydrotalcitecommonmineral · Mohs 2white, gray, pale green
Hydroxycancriniteraremineral · Mohs 5-6white, gray, yellow
Hydroxylellestaditeraremineral · Mohs 4.5-5colorless, white, gray
Hypersthenecommonmineral · Mohs 5-6black, dark brown, dark green
Ignimbritecommonigneous · Mohs 5-7gray, white, pink
Iimoriite-(Y)raremineral · Mohs 5-5.5white, gray, yellowish-white
Ikaiteraremineral · Mohs 2.5colorless, white, gray
Illitecommonmineral · Mohs 1-2white, gray, pale green
Imiteriteraremineral · Mohs 2.5silver-white, gray
Impactiteuncommonsedimentary · Mohs 5-7black, brown, green- No imageIndigo Gabbrocommonigneous · Mohs 6-7black, dark purple, gray
- No imageIngersoniteraremineral · Mohs 5colorless, white, gray
Insizwaiteraremineral · Mohs 4-5white, gray- No imageIridosmineraremineral · Mohs 6-7tin-white, silver-white, gray
Iris Agateraremineral · Mohs 6.5-7colorless, white, gray
Iron Orecommonmineral · Mohs 5-6.5red, black, brown- No imageIshiharaiteraremineral · Mohs 3-4gray, black
Itacolumiteuncommonsedimentary · Mohs 6-7yellow, brown, tan- No imageJaipuriteraremineral · Mohs 5.5gray, silver-white
Jarliteraremineral · Mohs 3.5-4colorless, white, gray- No imageJasp-Agatecommonmineral · Mohs 6.5-7red, yellow, brown
Jaspilitecommonsedimentary · Mohs 6-7red, gray, silver- No imageJasrouxiteraremineral · Mohs 2.5-3gray, dark gray, lead-gray
- No imageJedwabiteraremineral · Mohs 3.5-4silver-white, gray
Kaatialaiteraremineral · Mohs 2white, gray, greenish-white- No imageKalgoorlieiteraremineral · Mohs 2-3white, gray
Kaliniteuncommonmineral · Mohs 2white, colorless, gray
Kaliophiliteraremineral · Mohs 6white, colorless, yellowish
Kalsiliteraremineral · Mohs 6colorless, white, gray- No imageKalungaiteraremineral · Mohs 5-6white, gray
Kamiokiteraremineral · Mohs 5-6black, gray
Karliteraremineral · Mohs 6colorless, white, gray
Kegeliteraremineral · Mohs 2.5white, gray, colorless- No imageKeldyshiteraremineral · Mohs 5-6white, colorless, gray
Keokuk Geodecommonmineral · Mohs 7clear, white, gray
Kerniteuncommonmineral · Mohs 2.5-3colorless, white, gray
Keutschiteraremineral · Mohs 3-4gray, black
Khamrabaeviteraremineral · Mohs 8-9gray, silver-gray- No imageKharaelakhiteraremineral · Mohs 3.5-4gray, brownish-gray
- No imageKieftiteraremineral · Mohs 3.5silver-white, gray
Kitkaiteraremineral · Mohs 3.5white, gray
Knightiacommonfossiltan, brown, gray
Kolymiteraremineral · Mohs 3.5silvery white, gray- No imageKonderiteraremineral · Mohs 4.5-5white, gray
Kotoiteraremineral · Mohs 6.5white, gray, yellow
Kotulskiteraremineral · Mohs 2.5white, gray, pinkish-white
Kruťaiteraremineral · Mohs 3.5gray, silver-white- No imageKuramiteraremineral · Mohs 3.5-4gray, blackish-gray
Kurchatoviteraremineral · Mohs 4.5white, colorless, gray- No imageKurgantaiteraremineral · Mohs 3.5white, colorless, gray
- No imageKuzminiteraremineral · Mohs 2.5white, gray
Kyanitecommonmineral · Mohs 4.5-7blue, colorless, white- No imageKyanite Bladescommonmineral · Mohs 4.5-7blue, white, gray
- No imageLaachitecommonmineral · Mohs 7colorless, white, milky
Labradoritecommonmineral · Mohs 6-6.5gray, gray-green, blue- No imageLaflammeiteraremineral · Mohs 1.5-2white, gray
- No imageLaforêtiteraremineral · Mohs 3.5gray, white
Lake Superior Agatecommonmineral · Mohs 6.5-7red, orange, yellow
Lamproiterareigneousgray, greenish-gray, brown
Langbeiniteuncommonmineral · Mohs 3.5-4colorless, white, gray
Larniteraremineral · Mohs 6white, colorless, gray
Larvikitecommonigneous · Mohs 6gray, blue, black- No imageLaurentianiteraremineral · Mohs 5-6white, colorless, gray
Lawsoniteuncommonmineral · Mohs 8colorless, white, bluish-gray- No imageLead Ironraremineral · Mohs 2.5-3gray, lead-gray, black
Lechatelieriteuncommonmineral · Mohs 5.5-6.5colorless, white, gray- No imageLenaiteraremineral · Mohs 3silver-white, gray
Letoviciteraremineral · Mohs 2colorless, white, yellowish
Leucitecommonmineral · Mohs 5.5-6white, gray, colorless
Levantitecommonmineral · Mohs 6.5-7white, gray, brown- No imageLimb Castcommonfossil · Mohs 7clear, white, gray
Limecommonsedimentary · Mohs 3-4white, gray, yellow
Limestonecommonsedimentary · Mohs 3white, gray, tan
Linzhiiteraremineral · Mohs 3.5-4silvery white, gray
Lisetiteraremineral · Mohs 6white, colorless, gray- No imageLiuiteraremineral · Mohs 6-7silver-white, gray
Lizarditecommonmineral · Mohs 2.5-3green, yellow-green, white
Llaniterareigneous · Mohs 6-7brown, reddish-brown, gray
Lonsdaleiteraremineral · Mohs 7-8yellow, brown, gray
Lorenzeniteraremineral · Mohs 6brown, reddish-brown, gray
Loughliniteraremineral · Mohs 2white, gray- No imageLouisiana Opaluncommonmineral · Mohs 5.5-6brown, tan, gray
Lovozeriteraremineral · Mohs 5pink, brown, black
Luanheiteraremineral · Mohs 3.5silver-white, gray- No imageLukkulaisvaaraiteraremineral · Mohs 3-4white, gray
- No imageLumsdeniteraremineral · Mohs 3.5gray, steel gray
- No imageLunijianlaiteraremineral · Mohs 2-3white, gray, pale yellow
Luobusaiteraremineral · Mohs 3.5-4white, gray, silver-white
Luzoniteuncommonmineral · Mohs 3.5pinkish-brown, reddish-brown, gray
Mackinawiteuncommonmineral · Mohs 2.5bronze, yellowish-brown, gray
Magnesiochloritoidraremineral · Mohs 6.5dark green, black, gray
Magnesitecommonmineral · Mohs 3.5-4.5white, gray, yellow- No imageMagnesium Carbonatescommonmineral · Mohs 3.5-4.5white, colorless, gray
Malaniteraremineral · Mohs 5-6gray, white
Mammoth Toothcommonfossil · Mohs 2.5-3tan, brown, cream
Manatee Bonescommonfossil · Mohs 3-5tan, brown, gray- No imageManganoquadratiteraremineral · Mohs 3colorless, white, gray
Marblecommonmetamorphic · Mohs 3-4white, gray, black
Marcasitecommonmineral · Mohs 6-6.5pale brass-yellow, tin-white, gray
Margariteuncommonmineral · Mohs 3.5-4pink, white, yellow
Marialiteuncommonmineral · Mohs 5.5-6colorless, white, gray
Marićiteraremineral · Mohs 4-5colorless, white, gray
Mascagniteuncommonmineral · Mohs 2.5white, yellow, gray
Masloviteraremineral · Mohs 4.5-5white, gray
Mastodon Toothuncommonfossil · Mohs 3-5brown, tan, black- No imageMatrix Opalcommongemstone · Mohs 5.5-6.5multicolored, brown, black
- No imageMattagamiteraremineral · Mohs 3.5white, gray
Maucheriteraremineral · Mohs 5copper-red, silver-white, gray- No imageMavlyanoviteraremineral · Mohs 4white, gray
- No imageMayingiteraremineral · Mohs 3-3.5white, gray
- No imageMazzettiiteraremineral · Mohs 2.5-3black, gray
- No imageMeerschautitecommonmineral · Mohs 2white, gray, yellowish
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