Yellow Quartz (Citrine Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Category
Man Made Material
Browse man made material specimens identified by the Rock Identifier community.
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Tumbled epidote or epidote-rich stone
Epidote, Ca₂(Al,Fe)₃(SiO₄)₃(OH); possibly a green jasper or prehnite-epidote aggregate
mineral
Turquoise cabochon jewelry
Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Quartz-rich metamorphic rock, likely milky quartz or quartzite
Quartz (SiO₂); possibly quartzite composed predominantly of recrystallized quartz
metamorphic
Milky quartz (rough quartz specimen)
Quartz, silicon dioxide (SiO₂)
mineral
Malachite
Malachite (Cu2(CO3)(OH)2 - a copper carbonate hydroxide mineral)
Mineral
Weathered quartz-rich sandstone or quartzite
Quartzite (predominantly SiO₂), possibly strongly cemented sandstone
metamorphic
Basalt (Water-worn pebble)
Mafic Igneous Rock (primarily Plagioclase feldspar and Pyroxene)
igneous
Limestone
Calcium carbonate (CaCO3)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
sedimentary
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone
Arenite (mostly Quartz-based)
sedimentary
Sandstone (Quartz Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Serpentinite
Serpentinite (complex of lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Diamond
Carbon (C)
mineral
Red Jasper
Jasper (a variety of Chalcedony, SiO₂)
Mineraloid (cryptocrystalline quartz)
Serpentine (likely serpentinite)
Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and chromite
metamorphic
Tumbled serpentinite (likely antigorite-rich serpentine)
Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, chromite, or brucite
metamorphic
Chert (Brown Variety)
Silicon dioxide (SiO2)
sedimentary
Diamond
Native Carbon (C)
mineral
Diamond
Diamond (C)
Mineral
Flint
Chert (a form of cryptocrystalline quartz, chemical formula SiO₂)
Mineral
Banded Gneiss (River Cobble)
Gneiss (a high-grade metamorphic rock)
metamorphic
Pale green calcite
Calcite (CaCO₃), likely crystalline limestone or calcite-rich material
mineral
Aragonite Star Cluster (or Aragonite Sputnik)
Aragonite (Orthorhombic Calcium Carbonate, CaCO3)
mineral
Soapstone
Steatite (composed primarily of Talc: Mg3Si4O10(OH)2)
metamorphic
Granite
Granite (dominated by Quartz, Alkali Feldspar, and Plagioclase)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (likely Arkosic)
Clastic Sedimentary Rock
sedimentary
Sandstone (Ferruginous)
Arenite (Fe2O3 stained)
sedimentary
Pink Granite
Granite (Phaneritic Igneous Rock)
igneous
Limestone
CaCO3 (Mainly Calcite or Aragonite)
sedimentary
Muscovite Schist
KAl2(AlSi3O10)(OH)2 (Muscovite) in Schist Matrix
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4
metamorphic
Limestone (Micrite/Chalky variety)
Calcium Carbonate (CaCO3)
sedimentary
White Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral