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 121–240 of 744 gray rocks (page 2 of 7).
Gneisscommonmetamorphic · Mohs 5-7white, gray, pink
Goniatitecommonfossil · Mohs 3-4brown, gray, black
Granitecommonigneous · Mohs 6-7white, gray, pink
Granodioritecommonigneous · Mohs 6-7gray, white, black
Greywackecommonsedimentary · Mohs 6-7gray, dark gray, brownish gray
Grossularcommonmineral · Mohs 6.5-7green, brown, yellow
Gypsumcommonmineral · Mohs 1.5-2colorless, white, gray
Haüyneraremineral · Mohs 5.5-6blue, green, yellow
Heulanditecommonmineral · Mohs 3.5-4white, colorless, yellow
Horn Coralcommonfossil · Mohs 3-4gray, tan, brown
Hornfelscommonmetamorphic · Mohs 5-7gray, dark gray, black
Horsetail Fossilcommonfossil · Mohs 3-5gray, brown, black
Hypersthenecommonmineral · Mohs 5.5-6black, dark brown, dark green
Ignimbritecommonigneous · Mohs 5-7gray, white, pink
Impactiteuncommonsedimentary · Mohs 5-7black, brown, green
Iris Agateraremineral · Mohs 6.5-7colorless, white, gray
Iron Orecommonmineral · Mohs 5-6.5red, black, brown
Itacolumiteuncommonsedimentary · Mohs 6-7yellow, brown, tan
Keokuk Geodecommonmineral · Mohs 7clear, white, gray
Kerniteuncommonmineral · Mohs 2.5colorless, white, gray
Knightiacommonfossiltan, brown, gray
Kyanitecommonmineral · Mohs 5.5-7blue, colorless, white
Labradoritecommonmineral · Mohs 6-6.5gray, gray-green, blue- Labradoritecommonmineral · Mohs 6-6.5gray, gray-green, blue
Lake Superior Agatecommonmineral · Mohs 6.5-7red, orange, yellow
Lamproiterareigneousgray, greenish-gray, brown
Larvikitecommonigneous · Mohs 6gray, blue, black
Laumontitecommonmineral · Mohs 3-4white, colorless, yellow
Leucitecommonmineral · Mohs 5.5-6white, gray, colorless
Limestonecommonsedimentary · Mohs 3white, gray, tan
Lizarditecommonmineral · Mohs 2.5green, yellow-green, white
Llaniterareigneous · Mohs 6-7brown, reddish-brown, gray
Magnesitecommonmineral · Mohs 3.5-4.5white, gray, yellow
Mammoth Toothcommonfossil · Mohs 2.5-3tan, brown, cream
Manganitecommonmineral · Mohs 4dark gray, black, steel-gray
Marblecommonmetamorphic · Mohs 3-4white, gray, black
Marcasitecommonmineral · Mohs 6-6.5pale brass-yellow, tin-white, gray
Mastodon Toothuncommonfossil · Mohs 3-5brown, tan, black
Matrix Opalcommongemstone · Mohs 5.5-6.5multicolored, brown, black
Megalodon Toothcommonfossil · Mohs 3-5black, gray, brown
Mesoliteuncommonmineral · Mohs 5white, colorless, gray
Mesosideriterareigneous · Mohs 5-6silver, gray, black
Meteoriterareigneous · Mohs 5-8black, brown, gray
Mica Schistcommonmetamorphic · Mohs 3-6silver, gray, black
Microclinecommonmineral · Mohs 6-6.5white, gray, yellow- Microclinecommonmineral · Mohs 6-6.5white, gray, yellow
Migmatitecommonmetamorphic · Mohs 5-7black, white, gray
Molybdenitecommonmineral · Mohs 1-1.5lead-gray, bluish-gray, black
Montana Moss Agatecommonmineral · Mohs 6.5-7clear, white, gray
Moonstonecommongemstone · Mohs 6white, colorless, blue
Mosasaur Toothcommonfossil · Mohs 3-5black, brown, tan
Mudstonecommonsedimentary · Mohs 2-3gray, brown, red
Muscovitecommonmineral · Mohs 2.5-4colorless, yellow, brown
Mylonitecommonmetamorphic · Mohs 5-7gray, black, white
Native Arsenicuncommonmineral · Mohs 3.5tin-white, light gray, black
Native Silveruncommonmineral · Mohs 2.5-3silver-white, tarnish to gray or black, gray white
Natrolitecommonmineral · Mohs 5-5.5white, colorless, gray
Nautiloidcommonfossilbrown, gray, white
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
Obsidian Nodulecommonmineral · Mohs 5-5.5black, brown, gray
Oligoclasecommonmineral · Mohs 6-6.5white, colorless, gray
Oolitic Limestonecommonsedimentary · Mohs 3white, tan, gray
Orbicular Jaspercommonmineral · Mohs 6.5-7green, yellow, brown
Orthocerascommonfossil · Mohs 3-4black, brown, gray
Orthoclasecommonmineral · Mohs 6-6.5white, colorless, flesh-red
Owyhee Thundereggcommonmineral · Mohs 6.5-7blue, purple, white
Pectoliteuncommonmineral · Mohs 4.5-5white, gray, pale green- Pectoliteuncommonmineral · Mohs 4.5-5white, gray, pale green
Pegmatitecommonigneous · Mohs 6-7white, gray, pink
Perthitecommonmineral · Mohs 6white, gray, pink
Petoskey Stonecommonfossil · Mohs 3-4gray, brown, tan
Petrified Algaecommonfossil · Mohs 6.5-7tan, brown, gray
Petrified Cycaduncommonfossil · Mohs 6.5-7brown, tan, black
Petrified Palmcommonfossil · Mohs 6.5-7brown, tan, black
Petrified Palm Woodcommonfossil · Mohs 6.5-7tan, brown, black
Phacopscommonfossil · Mohs 3-5brown, gray, black
Phantom Quartzcommonmineral · Mohs 7colorless, white, gray
Phlogopitecommonmineral · Mohs 2-3brown, yellowish-brown, reddish-brown
Pietersiteuncommonmineral · Mohs 6.5-7blue, gold, brown
Plagioclasecommonmineral · Mohs 6-6.5white, gray, colorless
Plant Fossilcommonfossilbrown, black, gray
Plume Agatecommonmineral · Mohs 6.5-7white, gray, brown
Prehnitecommonmineral · Mohs 6-6.5green, yellow-green, white
Priday Thundereggcommonmineral · Mohs 6.5-7red, brown, white
Psilomelanecommonmineral · Mohs 5-6black, bluish-black, gray
Puddingstonecommonsedimentarymulticolored, gray, red
Pumicecommonigneous · Mohs 5.5-6white, gray, cream
Pyromorphiteuncommonmineral · Mohs 3.5-4green, yellow, brown
Pyrophyllitecommonmineral · Mohs 1-2white, gray, pale green
Quartzcommonmineral · Mohs 7colorless, white, gray
Quartzitecommonmetamorphic · Mohs 7white, gray, pink
Rhodonitecommonmineral · Mohs 5.5-6.5rose-pin k, brownish red, gray
Rhyolitecommonigneous · Mohs 6-7gray, pink, tan
Rock Gypsumcommonmineral · Mohs 2white, gray, colorless
Romanèchitecommonmineral · Mohs 5-6black, gray, grayish black
Rugose Coralcommonfossil · Mohs 3-4white, gray, brown
Sand Dollar Fossilcommonfossil · Mohs 3white, tan, gray
Sandstonecommonsedimentary · Mohs 6-7tan, brown, yellow
Sanidinecommonmineral · Mohs 6colorless, white, gray- Sanidinecommonmineral · Mohs 6colorless, white, gray
Satin Sparcommonmineral · Mohs 2white, colorless, gray
Scapolitecommonmineral · Mohs 6colorless, white, gray
Schistcommonmetamorphic · Mohs 3-6silver, gray, black
Sea Urchin Fossilcommonfossil · Mohs 3-5white, gray, tan
Selenitecommonmineral · Mohs 2colorless, white, gray
Septarian Nodulecommonsedimentary · Mohs 3-5brown, yellow, gray
Shalecommonsedimentary · Mohs 2-3gray, black, red
Shark Toothcommonfossil · Mohs 3-5black, brown, gray
Shocked Quartzraremineral · Mohs 7clear, white, gray
Sideritecommonmineral · Mohs 3.75-4.25yellow, brown, gray
Silicified Algaecommonfossil · Mohs 6.5-7tan, brown, gray
Silicified Ferncommonfossil · Mohs 6.5-7brown, black, gray
Silicified Lignitecommonfossil · Mohs 6.5-7brown, black, gray
Silicified Woodcommonfossil · Mohs 6.5-7brown, red, yellow
Silkstonecommonmineral · Mohs 7white, gray, yellow
Sillimanitecommonmineral · Mohs 6.5-7.5white, colorless, gray- Sillimanitecommonmineral · Mohs 6.5-7.5white, colorless, gray
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