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 481–600 of 862 gray rocks (page 5 of 8).
- No imageMegalodon Teethcommonfossil · Mohs 3-5gray, black, brown
Megalodon Toothcommonfossil · Mohs 3-5black, gray, brown
Meioniteuncommonmineral · Mohs 5.5-6white, colorless, yellow- No imageMeitneriteraremineral · Mohs 3white, gray
- No imageMelaconitecommonmineral · Mohs 3black, gray
- No imageMelliniiteraremineral · Mohs 5-6white, gray
Mendigiteraremineral · Mohs 4.5-5gray, white, colorless
Merwiniteraremineral · Mohs 6colorless, white, pale green
Mesosideriterareigneous · Mohs 5-6silver, gray, black
Metacinnabaruncommonmineral · Mohs 3black, gray, brownish-black
Meteoritesrareigneous · Mohs 5-8black, brown, gray
Mgriiteraremineral · Mohs 4.5white, gray
Miassiteraremineral · Mohs 3.5-4silver-white, gray
Mica Schistcommonmetamorphic · Mohs 3-6silver, gray, black
Microclinecommonmineral · Mohs 6white, gray, yellow
Migmatitecommonmetamorphic · Mohs 5-7black, white, gray- No imageMilotaiteraremineral · Mohs 3-3.5gray, white
Modderiteraremineral · Mohs 3.5white, gray
Mogániteuncommonmineral · Mohs 6gray, white, colorless
Monetiteraremineral · Mohs 3.5white, colorless, gray- No imageMonipiteraremineral · Mohs nullgray
Monohydrocalciteraremineral · Mohs 3white, colorless, gray- No imageMontana Agatecommonmineral · Mohs 6.5-7yellow, orange, brown
Montana Moss Agatecommonmineral · Mohs 6.5-7clear, white, gray
Montebrasiteuncommonmineral · Mohs 5.5-6white, colorless, yellow
Monticelliteuncommonmineral · Mohs 5colorless, white, gray
Montmorillonitecommonmineral · Mohs 1-2white, gray, yellow
Monzonitecommonigneous · Mohs 6-7gray, light gray, pinkish gray
Moonstonecommongemstone · Mohs 6white, colorless, blue
Mosasaur Toothcommonfossil · Mohs 3-5black, brown, tan
Mozarkitecommonmineral · Mohs 6.5-7red, pink, white
Mudstonecommonsedimentary · Mohs 2-3gray, brown, red
Mulliteuncommonmineral · Mohs 6-7white, gray, colorless- No imageMurashkoiteraremineral · Mohs 5-6silver-white, gray
- No imageMurchisiteraremineral · Mohs 2.5-3white, colorless, gray
Murmaniteraremineral · Mohs 2-3violet, brown, pink- No imageMutnovskiteraremineral · Mohs 1.5-2gray, white
Mylonitecommonmetamorphic · Mohs 5-7gray, black, white
Nagelschmidtiteraremineral · Mohs 5white, colorless, gray
Nahcoliteuncommonmineral · Mohs 2.5white, colorless, gray
Nantokiteraremineral · Mohs 2-2.5colorless, white, gray
Naquiteraremineral · Mohs 3.5white, gray
Nasledoviteraremineral · Mohs 3white, gray, pale yellow
Nasoniteraremineral · Mohs 4colorless, white, yellowish- No imageNative Aluminiumraremineral · Mohs 1.5white, silver-white, gray
Native Cadmiumraremineral · Mohs 2-2.5white, gray
Native Iridiumraremineral · Mohs 6.5silver-white, tin-white, gray- No imageNative Nickelraremineral · Mohs 5silver-white, gray
- No imageNative Osmiumraremineral · Mohs 7silver-white, bluish-white, gray
- No imageNative Rutheniumraremineral · Mohs 6.5white, silver-white, gray
- No imageNative Seleniumraremineral · Mohs 2gray, red, black
- No imageNative Siliconraremineral · Mohs 7gray, blue-gray, black
- No imageNative Tinraremineral · Mohs 1.5silvery-white, gray
- No imageNative Tungstenraremineral · Mohs 3.5gray, white
- No imageNative Zincraremineral · Mohs 2silver-white, gray, bluish-white
Natriteraremineral · Mohs 1-1.5colorless, white, gray
Natrolitecommonmineral · Mohs 5-5.5white, colorless, gray
Natroncommonmineral · Mohs 1-1.5colorless, white, gray
Nautiloidcommonfossilbrown, gray, white
Nekrasoviteraremineral · Mohs 3.5pinkish-brown, gray
Nephelinecommonmineral · Mohs 5.5-6white, gray, yellowish
Nepheline Syenitecommonigneous · Mohs 5.5-6gray, white, pink
Nephritecommonmineral · Mohs 6-6.5green, white, yellow
Nephrite Jadecommonmineral · Mohs 6-6.5green, white, yellow
Nickelraremineral · Mohs 4silver-white, gray
Nickelskutteruditeuncommonmineral · Mohs 5.5-6tin-white, silver-white, gray- No imageNickolayiteraremineral · Mohs 4-5white, gray
- No imageNieriteraremineral · Mohs 9gray, black, blue
- No imageNiningeriteraremineral · Mohs 3.5-4dark brown, black, gray
Niobocarbideraremineral · Mohs 8-9gray, yellowish-gray
Nisbiteraremineral · Mohs 5-6white, tin-white, gray
Niteruncommonmineral · Mohs 2white, colorless, gray
Nitrocalcitecommonmineral · Mohs 1.5-2white, colorless, gray
Nodulescommonsedimentarygray, brown, black- No imageNodules Filled With Opalcommonfossil · Mohs 5.5-6.5white, gray, brown
Norsethiteraremineral · Mohs 3.5white, colorless, gray
Northupiteuncommonmineral · Mohs 3.5-4white, gray, yellow
Noseanuncommonmineral · Mohs 5-5.5gray, blue, white
Novaculitecommonsedimentary · Mohs 7white, gray, black
Novákiteraremineral · Mohs 3-3.5silver-white, gray- No imageNuwaiteraremineral · Mohs 3.5white, gray
- No imageObsidian Nodulescommonmineral · Mohs 5-5.5black, brown, gray
Oldhamiteraremineral · Mohs 4yellowish-brown, brown, gray
Oligoclasecommonmineral · Mohs 6-6.5white, colorless, gray
Oolitecommonsedimentary · Mohs 3white, gray, tan- No imageOolitic Agatescommonmineral · Mohs 6.5-7white, gray, brown
Oolitic Limestonecommonsedimentary · Mohs 3white, tan, gray- No imageOpal-quartzcommonmineral · Mohs 6.5-7white, gray, brown
Orbicular Jaspercommonmineral · Mohs 6.5-7green, yellow, brown- No imageOrickiteraremineral · Mohs 2.5dark brown, black, gray
Orthocerascommonfossil · Mohs 3-4black, brown, gray
Orthoclasecommonmineral · Mohs 6white, colorless, flesh-red
Otaviteraremineral · Mohs 3.5white, gray, yellowish- No imageOwyhee Thundereggcommonmineral · Mohs 6.5-7blue, purple, white
Owyheeiteraremineral · Mohs 2.5steel-gray, silver-white, gray
Pabstiteraremineral · Mohs 6white, colorless, gray- No imagePalladobismutharsenideraremineral · Mohs 3.5white, gray
- No imagePalladosilicideraremineral · Mohs 5-5.5silver-white, gray
Palladseiteraremineral · Mohs 3-4white, gray- No imagePalmieriteraremineral · Mohs 3colorless, white, gray
Palygorskitecommonmineral · Mohs 2-3white, gray, yellowish-white
Paracelsianraremineral · Mohs 6colorless, white, gray
Paracostibiteraremineral · Mohs 3.5-4white, gray
Paragonitecommonmineral · Mohs 2.5colorless, white, yellowish- No imageParanatisiteraremineral · Mohs 5colorless, white, gray
- No imagePararsenolampriteraremineral · Mohs 1.5-2gray, silvery-gray, black
Pattersoniteraremineral · Mohs 2.5-3gray, silver-white
Pavoniteraremineral · Mohs 2gray, lead-gray
Paxiteraremineral · Mohs 3.5silver-white, gray
Pectoliteuncommonmineral · Mohs 4.5-5white, gray, pale green
Pegmatitecommonigneous · Mohs 6-7white, gray, pink
Perhamiteraremineral · Mohs 4colorless, white, gray
Perlitecommonigneous · Mohs 5-5.5gray, white, greenish
Perthitecommonmineral · Mohs 6white, gray, pink- No imagePertsevite-(F)raremineral · Mohs 5-6brown, colorless, gray
Petaliteuncommonmineral · Mohs 6-6.5colorless, white, gray
Petersenite-(Ce)raremineral · Mohs 3.5colorless, white, gray
Petoskey Stonescommonfossil · Mohs 3-4gray, brown, tan
Petrified Algaecommonfossil · Mohs 6.5-7tan, brown, gray- No imagePetrified Coralcommonfossil · Mohs 6.5-7white, gray, brown
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