Rare rocks & minerals
Rare rocks and minerals occur in only a handful of localities worldwide, or in such small quantities that good specimens command serious money. These are the trophy pieces of cabinet collectors.
Showing 841–960 of 4900 rare entries (page 8 of 41).
Chvaleticeiteraremineral · Mohs 2white, colorless, pale pink- No imageChvilevaiteraremineral · Mohs 3.5yellow, brownish-yellow
- No imageCianciulliiteraremineral · Mohs 3colorless, white, pale yellow
Ciprianiiteraremineral · Mohs 5-6pink, brown, yellowish-brown- No imageCiriottiiteraremineral · Mohs 3.5dark brown, black
- No imageCirroliteraremineral · Mohs 5yellow, brownish-yellow, white
Clairiteraremineral · Mohs 2.5yellow, brownish-yellow
Claraiteraremineral · Mohs 2blue, light blue, greenish-blue
Claringbulliteraremineral · Mohs 3blue, bluish-green
Clarkeiteraremineral · Mohs 4reddish-brown, brown, yellowish-orange
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
Cleusoniteraremineral · Mohs 5-6black
Clifforditeraremineral · Mohs 3.5yellow, yellowish-green, colorless- No imageClino-ferri-holmquistiteraremineral · Mohs 5-6dark blue, blue-green, black
- No imageClino-ferro-ferri-holmquistiteraremineral · Mohs 5.5-6dark green, black, brownish-black
Clino-ferro-suenoiteraremineral · Mohs 5-6brown, yellowish-brown, gray- No imageClino-oscarkempffiteraremineral · Mohs 3.5lead-gray, steel-gray
Clinobehoiteraremineral · Mohs 3-4colorless, white
Clinobisvaniteraremineral · Mohs 3-4yellow, orange-yellow, reddish-brown- No imageClinocervantiteraremineral · Mohs 4yellow, white
Clinochalcomeniteraremineral · Mohs 2-3blue, blue-green
Clinoclaseraremineral · Mohs 2.5-3dark blue, bluish-green- No imageClinoenstatiteraremineral · Mohs 5-6white, gray, colorless
- No imageClinofergusonite-(Ce)raremineral · Mohs 5.5-6.5black, brown, yellowish-brown
- No imageClinofergusonite-(Nd)raremineral · Mohs 5.5-6.5yellow, brown, black
- No imageClinofergusonite-(Y)raremineral · Mohs 5.5-6.5yellow, brown, black
Clinoferrosiliteraremineral · Mohs 5-6brown, greenish-brown, black
Clinohedriteraremineral · Mohs 5colorless, white, yellow
Clinohumiteraremineral · Mohs 6yellow, brown, orange
Clinojimthompsoniteraremineral · Mohs 2-3green, brown
Clinokurchatoviteraremineral · Mohs 4-5brown, gray, yellowish-brown- No imageClinometaboriteraremineral · Mohs 3.5colorless, white
Clinophosinaiteraremineral · Mohs 4.5colorless, white, pale yellow
Clinosaffloriteraremineral · Mohs 4.5-5.5tin-white, silver-white, iron-gray- No imageClinosulphurraremineral · Mohs 1.5-2.5yellow, pale yellow
- No imageClinotobermoriteraremineral · Mohs 4white, colorless
Clinoungemachiteraremineral · Mohs 2.5-3yellow, brownish-yellow
Cloncurryiteraremineral · Mohs 3blue, greenish-blue
Coalingiteraremineral · Mohs 2.5yellow, orange, brown
Cobaltraremineral · Mohs 5silver-white, grayish
Cobaltarthuriteraremineral · Mohs 3blue, blue-green
Cobaltaustiniteraremineral · Mohs 4.5bright green, yellowish-green- No imageCobaltkieseriteraremineral · Mohs 3.5pink, reddish-pink
Cobaltkoritnigiteraremineral · Mohs 2-3pink, pale pink, rose
Cobaltlotharmeyeriteraremineral · Mohs 4-5orange, red-orange, brown- No imageCobaltneustädteliteraremineral · Mohs 3-4dark green, blackish green
Cobaltoblöditeraremineral · Mohs 3violet, pink, purple
Cobaltomeniteraremineral · Mohs 2.5rose-red, pink, violet-red
Cobaltpentlanditeraremineral · Mohs 3.5-4bronze-yellow, yellowish-brown- No imageCobalttsumcoriteraremineral · Mohs 4.5pink, reddish-pink, violet-pink
- No imageCobaltzippeiteraremineral · Mohs 2orange, reddish-orange
Cocciniteraremineral · Mohs 2red, reddish-brown- No imageCochromiteraremineral · Mohs 7.5-8black
Coconinoiteraremineral · Mohs 1-2yellow, tan
Coesiteraremineral · Mohs 7.5colorless, white, gray
Coheniteraremineral · Mohs 5.5-6white, silver-white, tin-white
Coiraiteraremineral · Mohs 2.5black, lead-gray- No imageColdwelliteraremineral · Mohs 3-4white, pale yellow
- No imageColimaiteraremineral · Mohs 2dark gray, black
Colinowensiteraremineral · Mohs 3yellow, brownish-yellow
Collinsiteraremineral · Mohs 3.5brown, yellowish-brown, tan- No imageColor Change Garnetraregemstone · Mohs 7-7.5blue, green, purple
Coloradoiteraremineral · Mohs 2.5dark gray, black
Colquiriiteraremineral · Mohs 3.5colorless, white
Columbite-(Mg)raremineral · Mohs 6black, brownish-black
Colusiteraremineral · Mohs 3-4bronze-brown, dark gray, brass-yellow
Comancheiteraremineral · Mohs 2.5orange, reddish-orange, yellow
Combeiteraremineral · Mohs 5colorless, white, pale yellow- No imageComblainiteraremineral · Mohs 2yellow, brownish-yellow, brown
Compreignaciteraremineral · Mohs 2.5yellow, orange-yellow
Congoliteraremineral · Mohs 7white, colorless, gray
Connelliteraremineral · Mohs 3bright blue, azure blue, deep blue
Coombsiteraremineral · Mohs 2.5yellow, brown, black
Cooperiteraremineral · Mohs 4-5white, lead-gray- No imageCoparsiteraremineral · Mohs 3dark green, greenish black
Coquanditeraremineral · Mohs 2yellow, orange, colorless- No imageCoralloiteraremineral · Mohs 3-4white, pale pink
Corderoiteraremineral · Mohs 3bright red, orange-red, yellowish-orange
Cordylite-(Ce)raremineral · Mohs 4.5yellow, brown, gray- No imageCordylite-(La)raremineral · Mohs 4.5yellow, brown, white
Cornetiteraremineral · Mohs 4-5dark blue, greenish blue
Cornubiteraremineral · Mohs 3-4green, dark green, yellow-green
Cornwalliteraremineral · Mohs 3.5green, emerald green, dark green
Correianevesiteraremineral · Mohs 3-4yellow-brown, brown
Cortesognoiteraremineral · Mohs 5.5-6yellowish-brown, brown
Corvusiteraremineral · Mohs 2.5black, dark blue
Coskrenite-(Ce)raremineral · Mohs 2-3yellow, pale yellow
Costibiteraremineral · Mohs 5-6silver-white, tin-white
Cotunniteraremineral · Mohs 2.5white, colorless, yellowish
Coulsoniteraremineral · Mohs 5.5-6.5black, dark gray- No imageCousiniteraremineral · Mohs 2-3yellow, yellowish-brown
- No imageCoutinhoiteraremineral · Mohs 2-3yellow, brownish-yellow
Cowlesiteraremineral · Mohs 3white, colorless, pale yellow- No imageCoyoteiteraremineral · Mohs 1.5black
Cranswickiteraremineral · Mohs 2white, colorless
Crawforditeraremineral · Mohs 3colorless, white, pale yellow
Creaseyiteraremineral · Mohs 3-4bright green, yellow-green
Credneriteraremineral · Mohs 4.5black- No imageCrerariteraremineral · Mohs 3.5black
Crichtoniteraremineral · Mohs 5-6black
Criddleiteraremineral · Mohs 3-3.5gray- No imageCrimsoniteraremineral · Mohs 5-6red, crimson
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
- No imageCryobostryxiteraremineral · Mohs 2white, colorless
Cryoliteraremineral · Mohs 2.5-3white, colorless, yellowish
Cryolithioniteraremineral · Mohs 2.5-3colorless, white
Cryptohaliteraremineral · Mohs 2.5colorless, white, yellowish
Cryptophylliteraremineral · Mohs 3.5yellow, yellowish-green, brown- No imageCrystal Opalraregemstone · Mohs 5.5-6.5white, black, colorless
Cualstibiteraremineral · Mohs 2blue, greenish-blue- No imageCuatrocapaite-(K)raremineral · Mohs 2yellow, pale yellow
- No imageCuatrocapaite-(NH4)raremineral · Mohs 2yellow, pale yellow
- No imageCuboargyriteraremineral · Mohs 2.5lead-gray, black
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