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 1–120 of 744 gray rocks and minerals.
Acanthitecommonmineral · Mohs 2-2.5lead-gray, black, gray
Achondriterareigneous · Mohs 5-7gray, brown, black
Agatecommonmineral · Mohs 6.5-7white, gray, blue
Agatized Coralcommonfossil · Mohs 6.5-7white, gray, pink
Agatized Cycad Wooduncommonfossil · Mohs 6.5-7brown, tan, gray
Agatized Woodcommonfossil · Mohs 6.5-7brown, red, yellow
Alabastercommonmineral · Mohs 2white, colorless, gray
Albitecommonmineral · Mohs 6-6.5white, colorless, gray- Albitecommonmineral · Mohs 6-6.5white, colorless, gray
Alibates Flintuncommonmineral · Mohs 6.5-7red, white, blue
Ammonitecommonfossil · Mohs 3-4brown, gray, black
Amygdaloidal Basaltcommonigneous · Mohs 5-6gray, black, green
Analcimecommonmineral · Mohs 5-5.5colorless, white, gray
Anataseuncommonmineral · Mohs 5.5-6black, brown, blue
Andalusitecommonmineral · Mohs 6.5-7.5reddish-brown, brown, pink
Andesinecommonmineral · Mohs 6-6.5white, gray, greenish- Andesinecommonmineral · Mohs 6-6.5white, gray, greenish
Andesitecommonigneous · Mohs 6-7gray, dark gray, brownish-gray
Andraditecommonmineral · Mohs 6.5-7black, brown, green
Anglesitecommonmineral · Mohs 2.5-3colorless, white, yellow
Anhydritecommonmineral · Mohs 3-3.5colorless, white, gray
Ankeritecommonmineral · Mohs 3.5-4white, yellow, brown- Ankeritecommonmineral · Mohs 3.5-4white, yellow, brown
Annabergiteuncommonmineral · Mohs 1.5-2.5apple-green, pale green, white
Anorthiteuncommonmineral · Mohs 6-6.5white, colorless, gray- Anorthiteuncommonmineral · Mohs 6-6.5white, colorless, gray
Anorthositecommonigneous · Mohs 6white, gray, bluish-gray
Anthophyllitecommonmineral · Mohs 5.5-6brown, gray, white
Antigoritecommonmineral · Mohs 2.5-3.5green, yellow-green, brown
Aragonitecommonmineral · Mohs 3.5-4white, colorless, yellow
Arkosecommonsedimentary · Mohs 6-7pink, gray, tan
Arsenicuncommonmineral · Mohs 3.5lead gray, gray, white
Asbestoscommonmineral · Mohs 2.5-3white, green, gray
Augen Gneisscommonmetamorphic · Mohs 5-7gray, pink, white
Baculitecommonfossil · Mohs 3-4brown, gray, beige
Banded Iron Formationcommonsedimentary · Mohs 5-7red, gray, black
Baritecommonmineral · Mohs 3-3.5colorless, white, yellow
Belemnitecommonfossil · Mohs 3-4brown, black, gray
Biggs Jaspercommonmineral · Mohs 6.5-7tan, brown, cream
Bivalve Fossilcommonfossil · Mohs 3-5tan, brown, gray
Blastoidcommonfossilgray, brown, white
Boji Stonescommonmineral · Mohs 3.5-4brown, gray, black
Boraciteuncommonmineral · Mohs 7-7.5colorless, white, gray
Boraxcommonmineral · Mohs 2-2.5white, colorless, gray
Botswana Agatecommonmineral · Mohs 6.5-7gray, white, brown
Boulder Opaluncommongemstone · Mohs 5.5-6.5black, white, gray
Brachiopodcommonfossilgray, brown, white
Brazilian Agatecommonmineral · Mohs 6.5-7gray, white, brown
Brazilian Geodecommonmineral · Mohs 7purple, white, clear
Brecciacommonsedimentary · Mohs 3-7gray, brown, red
Bryozoancommonfossil · Mohs 3-5white, gray, tan
Bytowniteuncommonmineral · Mohs 6-6.5white, gray, yellowish- Bytowniteuncommonmineral · Mohs 6-6.5white, gray, yellowish
Cactus Quartzuncommonmineral · Mohs 7purple, white, yellow
Calymenecommonfossilgray, brown, tan
Cancriniteuncommonmineral · Mohs 5-6yellow, orange, white
Carbonatiterareigneous · Mohs 3-4white, gray, tan
Cassiteritecommonmineral · Mohs 6-7black, brown, reddish-brown
Cat's Eye Quartzuncommongemstone · Mohs 7gray, yellow, green
Cave Pearlscommonmineral · Mohs 3white, cream, gray
Celestinecommonmineral · Mohs 3-3.5colorless, white, pale blue
Cerussitecommonmineral · Mohs 3-3.5colorless, white, gray
Chalcedonycommonmineral · Mohs 6.5-7white, gray, blue
Chalcocitecommonmineral · Mohs 2.5-3lead-gray, black, tarnish-blue
Chalkcommonsedimentary · Mohs 1white, off-white, gray
Charlevoix Stonecommonfossil · Mohs 3-4gray, white, beige
Charnockitecommonigneous · Mohs 6-7gray, greenish, brown
Chertcommonmineral · Mohs 6.5-7white, gray, brown
Chert Nodulecommonmineral · Mohs 6.5-7gray, brown, black
Chiastolitecommonmineral · Mohs 6.5-7.5gray, yellowish-brown, reddish-brown
Chondritecommonigneous · Mohs 5-6gray, brown, black
Chrysoberyluncommonmineral · Mohs 8.5yellow, yellow-green, brown
Chrysotilecommonmineral · Mohs 2.5white, green, gray
Cinnabaruncommonmineral · Mohs 2-2.5red, brownish-red, scarlet
Claystonecommonsedimentary · Mohs 1-2gray, brown, red
Cobaltiteuncommonmineral · Mohs 5.5silver-white, reddish-white, gray
Colemaniteuncommonmineral · Mohs 4.5colorless, white, gray
Common Opalcommonmineral · Mohs 5.5-6.5white, gray, yellow
Concretioncommonsedimentary · Mohs 3-7brown, gray, tan
Concretion With Fossilcommonfossil · Mohs 3-5brown, gray, tan
Condor Agatecommonmineral · Mohs 6.5-7red, orange, yellow
Coral Fossilcommonfossil · Mohs 6.5-7white, tan, brown
Cordieritecommonmineral · Mohs 7-7.5blue, violet, gray
Corundumcommonmineral · Mohs 9colorless, red, blue
Crazy Lace Agatecommonmineral · Mohs 6.5-7white, gray, yellow
Crinoidcommonfossil · Mohs 3-4gray, white, tan
Crinoid Stemcommonfossil · Mohs 3-4gray, white, tan
Crinoidal Limestonecommonsedimentary · Mohs 3gray, tan, white
Crocodile Toothcommonfossil · Mohs 3-5brown, tan, black
Cryoliteraremineral · Mohs 2.5white, colorless, yellowish
Dendritic Agatecommonmineral · Mohs 6.5-7white, colorless, gray
Diamondcommongemstone · Mohs 10colorless, yellow, brown
Dinosaur Bonecommonfossil · Mohs 5.5-7brown, red, black
Dinosaur Coproliteuncommonfossil · Mohs 3-5brown, tan, black
Dinosaur Toothcommonfossil · Mohs 3-5brown, black, gray
Diopsidecommonmineral · Mohs 5.5-6.5white, gray, green
Dioritecommonigneous · Mohs 6-7gray, black, white
Dolomitecommonmineral · Mohs 3.5-4white, gray, pink
Dolostonecommonsedimentary · Mohs 3.5-4gray, white, buff
Echinoidcommonfossil · Mohs 3-4white, gray, tan
Elrathiacommonfossilbrown, gray, black
Enstatitecommonmineral · Mohs 5-6green, brown, gray
Epidotecommonmineral · Mohs 6-7pistachio green, yellowish-green, dark green
Eurypteriduncommonfossilbrown, black, tan
Eye Agatecommonmineral · Mohs 6.5-7white, gray, brown
Fern Fossilcommonfossilblack, brown, gray
Fish Fossilcommonfossil · Mohs 3-5brown, tan, gray
Fishtail Selenitecommonmineral · Mohs 2colorless, white, yellowish
Flintcommonmineral · Mohs 7gray, black, brown
Flint Nodulecommonmineral · Mohs 7gray, black, brown
Forsteritecommonmineral · Mohs 7green, yellow-green, colorless
Fossil Leafcommonfossil · Mohs 2-4brown, black, gray
Fossilized Ferncommonfossil · Mohs 3-6black, brown, gray
Fossilized Shark Toothcommonfossil · Mohs 3-5black, gray, brown
Fossilized Shellcommonfossil · Mohs 3-5white, gray, brown
Fulguriteuncommonmineral · Mohs 6.5-7white, gray, tan
Garnet Schistcommonmetamorphic · Mohs 3-7gray, brown, silver
Gastropod Fossilcommonfossilbrown, gray, white
Geodecommonsedimentary · Mohs 7white, gray, brown
Glaucophanecommonmineral · Mohs 6blue, blue-gray, lavender
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