Pearls (likely freshwater cultured pearls)
Pearl: nacre, primarily aragonite (CaCO₃) with conchiolin
gemstone
Category
Anthropogenic (Man Made Material Processed By Nature)
Browse anthropogenic (man made material processed by nature) specimens identified by the Rock Identifier community.
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Jasper (Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
mineral
Quartz
Silicon dioxide (SiO₂)
Mineral
Sandstone
Arenite
sedimentary
Diamond
Carbon (C)
mineral
Coquina or Fossiliferous Limestone
Fossiliferous Calcarenite (CaCO3)
sedimentary
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Porphyry
Porphyritic Igneous Rock
igneous
Chrysocolla
Hydrated copper silicate - Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)
mineral
Tektite
Impactite (Natural Silicate Glass)
meteorite
Chert (Nodule/Pebble)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Beaded Jewelry (Assorted Gemstones)
Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ
Mineral, Jewelry
Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Coquina / Shelly Limestone
Coquina (calcium carbonate, CaCO3)
sedimentary
Slate
Metamorphic pelitic rock
metamorphic
Red Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
mineral
Sandstone (with iron staining)
Quartz Arenite / Ferruginous Sandstone
sedimentary
Travertine (Tufa)
Chemical Sedimentary Limestone (CaCO3)
sedimentary
Faceted Glass (Costume Jewelry)
Amorphous Silicon Dioxide with colorants (Glass)
Synthetic/Man-made Material
Black Jasper (Black Onyx substitute)
Silicon Dioxide (SiO2) with carbonaceous impurities
sedimentary (microcrystalline quartz)
Jasper with Hematite inclusions
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
sedimentary
Polychrome Jasper
Silicon Dioxide (SiO2) with iron and other mineral inclusions
sedimentary
Chert / Flint (River Pebble)
Cryptocrystalline Quartz (SiO2)
sedimentary
Yellow Chert (Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Raw Amber / Resin Mineral
Succinite (Fossilized Tree Resin)
gemstone
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Bituminous Coal
Organic Sedimentary Rock (Carbon-based)
sedimentary
White Marble
Recrystallized Calcite Rock (CaCO3)
metamorphic
River Pebbles (Chert and Quartzite)
Sedimentary Clastic Rock (Silica-rich)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Red Jasper (Siltstone variant)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Jasper
Quartz (SiO2) with impurities
sedimentary
Jasper (Brown Iron-Rich Variety)
Silicon Dioxide (SiO2) with Fe2O3 (Iron Oxide/Crystalline Quartz)
sedimentary
Chalcedony (Agate/Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Jasper and Ironstone (likely Jasperized Ironstone)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
sedimentary
Sandstone
Arenite
sedimentary
Chrysocolla on Matrix
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral