Carnelian cabochon pendant
Carnelian, orange-red chalcedony (microcrystalline quartz, SiO₂)
gemstone
Category
Mineral (Man Made Glass)
Browse mineral (man made glass) specimens identified by the Rock Identifier community.
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Diamond (faceted)
Diamond (Pure Carbon, C)
mineral
Pearl
Aragonite (CaCO3) with Conchiolin
mineral
Chert (often called Flint)
Chert (SiO2)
sedimentary
Granite
Granite (Phaneritic Quartz-Feldspar intrusive rock)
Igneous
Diamond
Carbon (C)
gemstone
Diamond
Carbon (C)
gemstone
Sandstone (likely Quartzose)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
mineral
Chert (Flint / Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Mahogany Obsidian
Volcanic glass (SiO2 with Hematite/Magnetite inclusions)
igneous
Fossil or modern bivalve shell
Calcium carbonate shell, likely aragonite (CaCO₃); exact species cannot be determined from the image
fossil
Polished black stone egg, probably black obsidian
Obsidian, a natural volcanic glass; composition primarily silica-rich glass (approximately SiO₂), with variable iron and other trace elements
gemstone
Tumbled blue-green stone, likely chrysocolla or dyed chalcedony
Probable chrysocolla (hydrated copper aluminosilicate; variable composition), though appearance could also represent dyed chalcedony
mineral
Chert
Microcrystalline quartz (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Multicolored beryl gemstone bracelet
Beryl, Be₃Al₂Si₆O₁₈; likely mixed aquamarine, morganite, heliodor, and green beryl beads
gemstone
Slag (Industrial Byproduct)
Ferro-silicate glass (Slag)
Anthropogenic (Man-made industrial deposit)
Chert (variations include Flint/Novaculite)
Chert (formula: SiO2)
sedimentary
Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Pearl
Organic gemstone (Calcium carbonate - CaCO3)
mineral
Diamond
Carbon (C)
mineral
Diamond (in a jewelry setting)
Cubic Carbon (C)
mineral
Sandstone
Arenite
sedimentary
Basalt
Basalt
igneous
Likely slate
Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz
metamorphic
Unidentified gray stone/concrete-like fragment
Indeterminate; likely a fine-grained carbonate or cementitious geological fragment
sedimentary
Granite
Granite (phaneritic intrusive igneous rock consisting of quartz, feldspar, and mica)
igneous
Brown Chert
Microcrystalline Quartz (SiO2)
sedimentary
Moonstone (specifically Rainbow Moonstone / White Labradorite)
White Labradorite (Feldspar Group: (Na,Ca)(Al,Si)4O8)
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
White cabochon gemstone, likely milky chalcedony or opalite
Chalcedony: microcrystalline quartz, SiO₂; appearance may also indicate synthetic opalite glass
gemstone
Granodiorite
Intrusive Igneous Rock
igneous
Mica Schist
Mica Schist (principally Biotite/Muscovite, Quartz, and Feldspar)
metamorphic
Diamond
Carbon (C)
gemstone
Small dark rock fragment
Uncertain; possibly weathered basalt or slag
mineral
Chert Nodule
Microcrystalline Quartz
sedimentary
Chert (Flint)
Chert (SiO2)
sedimentary
Chert (Common Opal/Jasper variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint Nodules)
Cryptocrystalline Quartz (SiO2)
sedimentary
Siltstone Pebble
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary