Moss Agate
Chalcedony (SiO2) with dendritic inclusions of Manganese or Iron oxide
mineral
Category
Organic Gemstone (Not A Rock Or Mineral)
Browse organic gemstone (not a rock or mineral) specimens identified by the Rock Identifier community.
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Moss Agate
Chalcedony (Silicon Dioxide) with dendritic inclusions (SiO2)
mineral
Moss Agate
Silicon Dioxide (Chalcedony variety)
mineral
Calligraphy Stone
Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)
sedimentary
Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3 with Carotenoid pigments)
Mineraloid (Organic Gemstone)
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Geode with Quartz Crystal Cavity
Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix
sedimentary
Pearl (nacre)
Calcium Carbonate (mostly CaCO3 as Aragonite) and Conchiolin
Organic Mineraloid
Malachite-bearing Rock
Cu2CO3(OH)2
mineral
Amber
Succinite (fossilized resin)
mineral
Sandstone (likely Arkose or Quartz Sandstone)
Arenite (SiO2 principal component)
sedimentary
Jasper (Brown Iron-Rich Variety)
Silicon Dioxide (SiO2) with Fe2O3 (Iron Oxide/Crystalline Quartz)
sedimentary
Concretionary Sandstone
Clastic Sedimentary Rock (Sandstone with secondary mineral cementation)
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Bituminous Coal (with Anthracite or Vitrinite inclusion)
Organic-rich Sedimentary Rock (Carboniferous classification)
sedimentary
Petrified Wood
Silicified wood (Quartz replacement of organic wood structure)
fossil
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Polished amber
Fossilized tree resin; chiefly terpenoid polymers (succinite)
organic gemstone
Petrified Wood (Silicified Wood)
Silicified fossil wood (SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
fossil
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2)
mineral
Limestone and Quartz Gravel with Petrified Wood
Sedimentary gravel aggregate and fossilized wood
sedimentary
Amber (Copal)
Succiniferous Resin
mineraloid
Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Jaspery variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint Nodules)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Mudstone)
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succinite (formula varies, primarily C10H16O)
Mineraloid (Organic)
Sandstone Chert Concretion
Silica-cemented Concretion (primarily SiO2)
sedimentary
Weathered chert or silicified limestone
Microcrystalline quartz (SiO₂), likely chert formed by silicification of carbonate rock
sedimentary
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Moss Agate
Silicon Dioxide with inclusions (SiO2 + Fe/Mg/Mn/Chlorite)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18 with Chromium/Vanadium traces)
gemstone
Black Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Glauconite (Green Sandstone)
Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2
sedimentary
Fossilized Shark Tooth
Chondrichthyes (class) fossilized tooth
fossil
Fossilized Bivalve Shell
Bivalvia (Phylum Mollusca)
fossil
Moss Agate
Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide
mineral
Dendritic Agate
Chalcedony (SiO2) with manganese/iron oxide inclusions
mineral