Specular Hematite
Iron(III) oxide (Fe2O3)
mineral
Category
Mineral And Organic Gemstone
Browse mineral and organic gemstone specimens identified by the Rock Identifier community.
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Yellow Jasper / Chert
Jasper (Silica/Quartz) - SiO2
sedimentary
Graywacke
Lithic Sandstone (Graywacke)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2) / Microcrystalline Quartz
sedimentary
Chert (specifically Tan Chert or Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Flint or Jasper variant)
Microcrystalline silica (SiO2)
sedimentary
Chert (Jasper/Jasperoid)
Chert (chemically precipitated microcrystalline Quartz, SiO2)
sedimentary
Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Red Chert (Jasper)
Cryptocrystalline Quartz (SiO2) with iron oxide inclusions
sedimentary
Jasper
Jasper (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Chert (Flint)
Chert (Microcrystalline Silica, SiO2)
sedimentary
Chert (specifically Flint or Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint/Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Brown variety / Common Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Amber in Matrix
Succinite (Carbon-based organic polymer)
Organic (Sedimentary context)
Amber
Succinite (fossilized resin)
Mineral
Amber
Succinite (fossilized tree resin)
Organic Mineraloid
Tree Agate (also known as Dendritic Agate)
Silicon Dioxide with inclusions (SiO2 + Mn/Fe)
mineral
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Citrine
Silicon Dioxide (SiO2)
mineral
Sunstone
Aventurine Feldspar (Plagioclase Feldspar with inclusions)
mineral
Jasper
Jasper (Silicon Dioxide) - SiO2
sedimentary
Chert Pebble (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Black Limestone with Calcite Veining
Bituminous Limestone (CaCO3 with Organic Carbon inclusions)
sedimentary
Bort or Carbonado
C - Polycrystalline Diamond
mineral
Chert (Yellow/Tan)
Microcrystalline Quartz (SiO2)
sedimentary
Mother of Pearl (Nacre)
Aragonite (CaCO3) with Organic Matrix
mineral
Chert (often called Flint in dark varieties)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Kidney Stone
Calcium Oxalate (CaC2O4·nH2O)
mineral
Zebra Marble
Metamorphosed Limestone (Recrystallized Calcite)
metamorphic
Garnet (Almandine/Pyrope series)
Silicate mineral (Almandine: Fe3Al2Si3O12; Pyrope: Mg3Al2Si3O12)
mineral
Dendritic Agate (Tree Agate)
Chalcedony (Silicon Dioxide, SiO2) with Manganese or Iron Oxide inclusions
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Chert (specifically Flint or Common Chert)
Silicon dioxide (SiO2) - Microcrystalline quartz
sedimentary
Jasper (Petrified Wood variant)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary