Diamond
Carbon (C)
gemstone
Category
Mineralological Specimen
Browse mineralological specimen specimens identified by the Rock Identifier community.
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Diamond inlaid in Jewelry
Carbon (C)
mineral
Copper-stained quartz/igneous rock specimen
Quartz (SiO₂), with secondary copper minerals; host likely altered volcanic rock
mineral
Unidentified weathered mineral/rock fragment
Indeterminate; likely a weathered iron-rich silicate or sulfide-bearing specimen
mineral
Botryoidal Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Blue Obsidian (Cullet Glass)
Silicon Dioxide (Amorphous Glass)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
sedimentary
Polished Agate Geode
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Limonite-stained Chert/Jasper
Microcrystalline Quartz (SiO2) with Iron Oxides (FeO(OH)·nH2O)
sedimentary
Jasper (Green Jasper/Heliotropic Chert)
Silicon Dioxide (SiO₂)
sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline SiO2)
sedimentary
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Granite (with Beryl/Aquamarine)
Granite (Feldspar, Quartz, Mica, and Beryl Be3Al2Si6O18)
igneous
Iron-rich breccia or weathered limonite-bearing rock
Goethite–limonite ironstone, possibly ferruginous breccia
sedimentary
Slate with Fossiliferous Impressions
Metamorphosed Argillaceous Rock (Fossiliferous Slate)
metamorphic
Chert (or Chalcedony) Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Agate
Chalcedony (Microcrystalline Quartz) - SiO2
Mineral
Weathered granitic rock
Granite, likely biotite-bearing granite or granodiorite
igneous
Quartz on Sandstone
Silicon Dioxide (SiO2) in Lithic Sandstone
sedimentary
Granite
Granite (composed mainly of Quartz, Potassium Feldspar, Plagioclase, and Biotite/Mica)
igneous
Chalcedony with Quartz
Silicon Dioxide (SiO2)
mineral
Quartz with Mica (likely Muscovite)
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate Hydroxide Fluoride
igneous/metamorphic
Tiger's Eye (Tumbled Blue/Black-Golden variety)
Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)
metamorphic
Unable to identify - Image contains non-geological items
N/A
Copper Ore (Malachite, Azurite, and Chalcopyrite in Host Rock)
Copper-bearing polymetallic mineral aggregate (Cu-minerals)
mineral
Silicified fossil-bearing chert
Microcrystalline quartz (SiO₂), likely chalcedony replacing carbonate shell material
fossil
Geode with Quartz and Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Peacock Ore
Bornite (Cu5FeS4) with surface tarnish
mineral
Quartz (Raw Chunk)
Silicon Dioxide (SiO2)
mineral
Probable weathered granite or granitic gneiss
Granite/granitic gneiss; mainly quartz, feldspar, and mica
igneous
Druzy Quartz on Matrix (Chert/Limestone)
Silicon Dioxide (SiO2) with Carbonate host rock
sedimentary
Druzy Quartz on Matrix (likely Limestone or Sandstone)
Silicon Dioxide (SiO2) with various trace impurities
Mineral on Sedimentary Rock
Agate
Silicon dioxide (SiO2) - variety Chalcedony
mineral
Tumbled yellow-green stone, possibly serpentine
Likely serpentine-group mineral (Mg₃Si₂O₅(OH)₄); exact identification requires testing
mineral
Rose quartz
Quartz, silicon dioxide (SiO₂), variety rose quartz
mineral
Banded Serpentinite with Calcite Veins
Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Quartz Crystal (Smoky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Crystalline Silica (SiO2)
mineral
Quartz Cluster (Likely Ferruginous)
Silicon Dioxide (SiO2)
mineral
Rose quartz (likely rough specimen)
Quartz, silicon dioxide (SiO₂), pink variety
mineral
Blue-gray mineral specimen (possibly sodalite)
Undetermined; appearance may be consistent with sodalite (Na₈Al₆Si₆O₂₄Cl₂), but the image is insufficient for reliable identification
mineral