Mohs hardness 3 rocks & minerals
Mohs hardness 3 is the calcite mark — easily scratched by a copper coin. Many carbonates and softer sulfides cluster here.
Showing 481–600 of 2721 rocks (page 5 of 23).
Chioliteraremineral · Mohs 3.5-4white, colorless- No imageChirvinskyiteraremineral · Mohs 3-4yellow, yellowish-brown, brown
- No imageChistyakovaiteraremineral · Mohs 2-3yellow, greenish-yellow
- No imageChloraluminiteraremineral · Mohs 2.5white, colorless
Chlorargyriteuncommonmineral · Mohs 1.5-2.5white, gray, yellow
Chlorbartoniteraremineral · Mohs 3-3.5dark green, olive green, black
Chloritecommonmineral · Mohs 2-2.5green, dark green, blackish green- No imageChlormanganokaliteraremineral · Mohs 2.5colorless, white, yellowish
- No imageChlorocalciteraremineral · Mohs 2.5white, colorless, yellow
- No imageChloromeniteraremineral · Mohs 2.5green
Chlorophoeniciteraremineral · Mohs 3-3.5pink, reddish-pink, yellowish-orange
Chlorothioniteraremineral · Mohs 2.5blue, blue-green
Chloroxiphiteraremineral · Mohs 2.5dark olive-green, pistachio-green
Choloaliteraremineral · Mohs 3yellow, greenish-yellow- No imageChongiteraremineral · Mohs 2-3white, colorless
- No imageChovaniteraremineral · Mohs 3-3.5lead-gray, black
Chrisstanleyiteraremineral · Mohs 2.5white, light gray
Christeliteraremineral · Mohs 2.5colorless, white
Chromatiteraremineral · Mohs 2.5-3yellow, yellowish-orange- No imageChromphylliteraremineral · Mohs 2.5-3emerald-green, bright green
Chrysocollacommonmineral · Mohs 2-4blue, blue-green, green
Chrysotilecommonmineral · Mohs 2.5-3white, green, gray
Chrysotile Asbestoscommonmineral · Mohs 2.5-3white, gray, green- No imageChukanoviteraremineral · Mohs 3.5pale green, white, colorless
- No imageChukhrovite-(Ca)raremineral · Mohs 3-4white, colorless, violet
- No imageChukhrovite-(Ce)raremineral · Mohs 3-4white, colorless, pale violet
- No imageChukhrovite-(Nd)raremineral · Mohs 3-4white, pale pink, pale yellow
Chukhrovite-(Y)raremineral · Mohs 3-4white, colorless, violet
Churchite-(Y)raremineral · Mohs 3white, colorless, pale yellow- No imageChvilevaiteraremineral · Mohs 3.5yellow, brownish-yellow
- No imageCianciulliiteraremineral · Mohs 3colorless, white, pale yellow
Cinnabaruncommonmineral · Mohs 2-2.5red, brownish-red, scarlet- No imageCiriottiiteraremineral · Mohs 3.5dark brown, black
Clairiteraremineral · Mohs 2.5yellow, brownish-yellow
Claringbulliteraremineral · Mohs 3blue, bluish-green
Claudetiteraremineral · Mohs 2.5white, colorless
Clausthaliteraremineral · Mohs 2.5-3lead-gray, bluish-gray- No imageClearcreekiteraremineral · Mohs 2-3colorless, white, yellowish
- No imageCleriteraremineral · Mohs 3-3.5lead-gray, silver-white
Clifforditeraremineral · Mohs 3.5yellow, yellowish-green, colorless- No imageClino-oscarkempffiteraremineral · Mohs 3.5lead-gray, steel-gray
Clinoatacamiteuncommonmineral · Mohs 3dark green, bright green, emerald green
Clinobehoiteraremineral · Mohs 3-4colorless, white
Clinobisvaniteraremineral · Mohs 3-4yellow, orange-yellow, reddish-brown
Clinochalcomeniteraremineral · Mohs 2-3blue, blue-green
Clinochlorecommonmineral · Mohs 2-2.5green, dark green, yellowish green
Clinoclaseraremineral · Mohs 2.5-3dark blue, bluish-green
Clinojimthompsoniteraremineral · Mohs 2-3green, brown- No imageClinometaboriteraremineral · Mohs 3.5colorless, white
Clinoptilolite-Cacommonmineral · Mohs 3.5-4white, colorless, pink
Clinoptilolite-Kcommonmineral · Mohs 3.5-4white, colorless, yellow
Clinoptilolite-Nacommonmineral · Mohs 3.5-4white, colorless, gray- No imageClinosulphurraremineral · Mohs 1.5-2.5yellow, pale yellow
Clinoungemachiteraremineral · Mohs 2.5-3yellow, brownish-yellow
Clintoniteuncommonmineral · Mohs 3.5-6yellowish-white, reddish-brown, greenish
Cloncurryiteraremineral · Mohs 3blue, greenish-blue
Coalcommonsedimentary · Mohs 0.5-2.5black, brown
Coalingiteraremineral · Mohs 2.5yellow, orange, brown
Cobaltarthuriteraremineral · Mohs 3blue, blue-green- No imageCobaltkieseriteraremineral · Mohs 3.5pink, reddish-pink
Cobaltkoritnigiteraremineral · Mohs 2-3pink, pale pink, rose- No imageCobaltneustädteliteraremineral · Mohs 3-4dark green, blackish green
Cobaltoan Calciteuncommonmineral · Mohs 3pink, magenta, rose-red
Cobaltoblöditeraremineral · Mohs 3violet, pink, purple
Cobaltomeniteraremineral · Mohs 2.5rose-red, pink, violet-red
Cobaltpentlanditeraremineral · Mohs 3.5-4bronze-yellow, yellowish-brown
Coiraiteraremineral · Mohs 2.5black, lead-gray- No imageColdwelliteraremineral · Mohs 3-4white, pale yellow
Colinowensiteraremineral · Mohs 3yellow, brownish-yellow
Collinsiteraremineral · Mohs 3.5brown, yellowish-brown, tan
Colorado Yule Marblecommonmetamorphic · Mohs 3-4white, gray
Coloradoiteraremineral · Mohs 2.5dark gray, black
Colquiriiteraremineral · Mohs 3.5colorless, white
Colusiteraremineral · Mohs 3-4bronze-brown, dark gray, brass-yellow
Comancheiteraremineral · Mohs 2.5orange, reddish-orange, yellow
Compreignaciteraremineral · Mohs 2.5yellow, orange-yellow
Concretioncommonsedimentary · Mohs 3-7brown, gray, tan
Concretions With Fossilscommonfossil · Mohs 3-5brown, gray, tan
Connelliteraremineral · Mohs 3bright blue, azure blue, deep blue
Cookeiteuncommonmineral · Mohs 2.5-3white, yellow, pink
Coombsiteraremineral · Mohs 2.5yellow, brown, black
Copalcommonfossil · Mohs 1.5-2.5yellow, orange, brown- No imageCopalitecommonfossil · Mohs 2-2.5yellow, orange, brown
- No imageCoparsiteraremineral · Mohs 3dark green, greenish black
Copiapitecommonmineral · Mohs 2.5-3yellow, golden yellow, orange yellow
Coppercommonmineral · Mohs 2.5-3copper-red, reddish-brown- No imageCopper Nuggetscommonmineral · Mohs 2.5-3reddish-brown, copper-red, tarnished brown
Coquimbiteuncommonmineral · Mohs 2.5violet, pale violet, white
Coquinacommonsedimentary · Mohs 3tan, white, light gray
Coralcommonfossil · Mohs 3-4white, pink, red- No imageCoralloiteraremineral · Mohs 3-4white, pale pink
Corderoiteraremineral · Mohs 3bright red, orange-red, yellowish-orange
Corkiteuncommonmineral · Mohs 3.5-4yellow, brown, greenish-brown
Cornubiteraremineral · Mohs 3-4green, dark green, yellow-green
Cornwalliteraremineral · Mohs 3.5green, emerald green, dark green
Correianevesiteraremineral · Mohs 3-4yellow-brown, brown
Corrensiteuncommonmineral · Mohs 2-3green, yellow, white
Corvusiteraremineral · Mohs 2.5black, dark blue
Cosaliteuncommonmineral · Mohs 2.5-3lead-gray, steel-gray, white
Coskrenite-(Ce)raremineral · Mohs 2-3yellow, pale yellow
Cotunniteraremineral · Mohs 2.5white, colorless, yellowish- No imageCousiniteraremineral · Mohs 2-3yellow, yellowish-brown
- No imageCoutinhoiteraremineral · Mohs 2-3yellow, brownish-yellow
Cowlesiteraremineral · Mohs 3white, colorless, pale yellow
Crawforditeraremineral · Mohs 3colorless, white, pale yellow
Creaseyiteraremineral · Mohs 3-4bright green, yellow-green
Creediteuncommonmineral · Mohs 3.5-4colorless, white, orange- No imageCrerariteraremineral · Mohs 3.5black
Criddleiteraremineral · Mohs 3-3.5gray
Crinoid Stemscommonfossil · Mohs 3-4gray, white, tan
Crinoidal Limestonecommonsedimentary · Mohs 3gray, tan, white
Crinoidscommonfossil · Mohs 3-4gray, white, tan- No imageCrocodile Toothcommonfossil · Mohs 3-5brown, tan, black
Crocoiteraremineral · Mohs 2.5-3orange, red
Cronstedtiteraremineral · Mohs 3.5black, brownish-black, dark green- No imageCronusiteraremineral · Mohs 3.5black
Crookesiteraremineral · Mohs 2.5-3lead-gray, bluish-white- No imageCrowningshielditeraremineral · Mohs 3.5-4black, brown
Cryoliteraremineral · Mohs 2.5-3white, colorless, yellowish
Cryolithioniteraremineral · Mohs 2.5-3colorless, white
Identify your specimen
Open RockHoundR to compare hardness, streak, and locality against your find.
