Natural Pearl (appearing in a jewelry setting)
Calcium Carbonate (mostly Aragonite), CaCO3 with Conchiolin
mineral
Category
Mineraloid (Man Made Origin)
Browse mineraloid (man made origin) specimens identified by the Rock Identifier community.
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Rough Diamond
Diamond (pure Carbon, C)
mineral
Amethyst (Tumbled Cabinet Stone)
Silicon Dioxide (SiO2) with iron impurities
mineral
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Pink Granite
Intrusive Igneous Rock (high K-feldspar content)
igneous
Chert
Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite
sedimentary
Granite
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Diamond
Native Carbon (C)
mineral
Sandstone (Quartz Arenite)
Sandstone (dominated by SiO2 quartz grains)
sedimentary
Chert (Nodule)
Chert (Silicon Dioxide, SiO2)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2) with trace aluminum and irradiation
mineral
Ferruginous Sandstone (Ironstone)
Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Sandstone
Arenite
sedimentary
Red Sandstone
Clastic Sedimentary Mineraloid (predominantly Quartz grains with Iron Oxide cement)
sedimentary
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Rutilated Quartz
Quartz with Rutile inclusions (SiO2 with TiO2)
mineral
Chert (often called Flint or Jasper if reddish)
Microcrystalline Quartz (SiO2)
sedimentary
Coquina
Coquina (Biogenic Limestone / CaCO3)
sedimentary
Chert (varieties include Flint and Mudstone)
Microcrystalline Silica (SiO2)
sedimentary
Chert (with Desert Varnish/Iron Stain)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2 + Fe2O3)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Coquina / Fossiliferous Limestone
Coquina (composed primarily of Calcium Carbonate / CaCO3)
sedimentary
Diorite
Diorite
igneous
Jasper Marble
Silicon Dioxide (SiO2) with Impurities
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Nephrite Jade
Nephrite
Mineral/Rock
Bauxite
Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))
sedimentary
Sandstone (Pebble/Conglomerate fragment)
Sandstone (clastic sedimentary rock)
Sedimentary Rock
Amber
Succinate (Succinite for Baltic varieties)
Organic Mineraloid
Amber
Succinite (fossilized tree resin)
Organic Mineraloid
Amber
Succinite (C10H16O)
Mineraloid (Organic)
Jade (likely Jadeite or Nephrite)
Jadeite (NaAlSi2O6) or Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)
Mineral/Mineraloid
Jade
Jadeite or Nephrite
Mineral/Mineraloid
Amber
Succinite (with formula approximately C10H16O)
Organic mineraloid
Pearl (Cultured or Natural)
Aragonite (CaCO3) with Conchiolin
Organic Mineraloid
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary (or mineraloid)
Amber
Succinite (Fossilized Tree Resin)
Organic Mineraloid
Amber
Succinite (Fossilized Tree Resin), C10H16O
Organic Mineraloid