Quartz
Silicon Dioxide (SiO2)
Mineral
Category
Man Made Glass
Browse man made glass specimens identified by the Rock Identifier community.
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Nephrite Jade
Tremolite-Actinolite solid solution Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Diamond in Kimberlite
Diamond (C in Kimberlite Matrix)
igneous
Sandstone (lithic)
Lithic Wacke / Arenite
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
White Quartz
Quartz (SiO2)
Mineral
Sandstone
Arenite (SiO2 based with various mineral cements)
sedimentary
Chert (Fossiliferous)
Silicon dioxide (SiO2)
sedimentary
Granite Cobble
Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Granite
Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)
igneous
Sandstone (Ferruginous)
Arenite (Fe2O3 rich)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Milky Quartz
Silicon dioxide (SiO2)
mineral
Chert (Chalk-associated Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Quartz (on matrix)
Quartz (Silicon Dioxide, SiO₂)
Mineral
Granite
Granite (Phaneritic Quartz-Feldspar Rock)
igneous
Pearl (Biogenic Mineraloid)
Calcium carbonate (CaCO3) primarily as Aragonite
mineral
Quartz (likely Yellow/Orange variety, possibly Citrine or Chalcedony with iron staining)
Quartz (SiO₂)
Mineral
Chert (also known as Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartz
Quartz (SiO₂ - Silicon Dioxide)
mineral
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2 with various lithic fragments)
sedimentary
Quartz (likely Milky Quartz)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Diamond (Cut Gemstone)
Carbon (C)
gemstone
Quartzite (Iron-stained)
Quartzite (SiO2 with iron oxides)
metamorphic
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Granite
Granite (Mainly Quartz SiO2, K-Feldspar KAlSi3O8, and Plagioclase)
igneous
Pearl
Calcium carbonate (CaCO3) - mainly Aragonite with Conchiolin
mineraloid
Granite
Phaneritic Felsic Igneous Rock
igneous
Quartz (likely) or a Quartzite Pebble
Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.
Mineral, specifically a detrital grain
Sandstone (likely Fossiliferous)
Arenite / Sedimentum arenaceum
sedimentary
Gypsum (Satin Spar / Alabaster variety)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Synthetic Convention Badge (Plastic/PVC)
Polyvinyl Chloride (PVC) / Polycarbonate
mineraloid (synthetic)
Sandstone Chert/Quartzite
Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite
sedimentary
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Veined Quartz
SiO2 (Silicon Dioxide)
Mineral
Quartz
Quartz (SiO₂)
Mineral
Quartz
Silicon Dioxide (SiO2)
Mineral