Agate
Chalcedony (cryptocrystalline quartz)
Mineral
Category
Anthropogenic Material (Man Made Rock)
Browse anthropogenic material (man made rock) specimens identified by the Rock Identifier community.
Agate
Agate (a variety of Chalcedony, SiO2)
Mineral
Granite
Granite (a common rock type, not a single mineral; composed primarily of Quartz, Feldspar (Orthoclase and Plagioclase), and Mica (Biotite and/or Muscovite) and/or Amphibole)
Igneous
Red Tiger's Eye beads
Tiger's Eye (variety of Chalcedony, SiO2)
Mineral / Gemstone (variety of Quartz)
Banded Chert
Chert (a microcrystalline variety of quartz, SiO2 with minor impurities)
Sedimentary
Quartzite
Quartzite (SiO2)
Metamorphic
Pyrite
Pyrite (Iron Disulfide), FeS2
Mineral
Diamond
Diamond (Carbon, C)
mineral
Chert (Yellow Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Bauxite Ore
Hydrated aluminum oxides (e.g., Gibbsite Al(OH)3, Boehmite ̲̲̲̲AlOOH, Diaspore ̲̲̲̲AlOOH)
Mineral
Chert (Jasper-like)
SiO2 (Cryptocrystalline Quartz)
Sedimentary
Chert (Flint)
Chert (predominantly SiO₂ - silicon dioxide)
sedimentary
Clear Quartz (or Rock Crystal)
Quartz (SiO₂)
Mineral
Moonstone (bead form)
Potassium Aluminum Silicate (KAlSi3O8) - a variety of Orthoclase Feldspar
Mineral
Aventurine
Aventurine Quartz (SiO2 with inclusions)
Mineral
Amethyst Geode/Cluster
Quartz (SiO2) - variety Amethyst
Mineral
Quartz (possibly milky quartz)
Quartz (Silica; SiO₂)
Mineral
Halite
Halite (NaCl)
Mineral
Granodiorite
Granodiorite
Igneous
Diamond (in a jewelry setting)
Carbon (C)
mineral
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Shale
Shale
sedimentary
Diabase (Dolerite)
Diabase / Dolerite
igneous
Chalcedony or Chert/Jasper with secondary mineral staining
SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.
Mineral, potentially a rock with chalcedony/jasper.
Agate (or Banded Agate)
Agate (a variety of Chalcedony, which is a cryptocrystalline form of Quartz); Chemical Formula: SiO₂ (Silicon Dioxide)
Mineral, specifically a Cryptocrystalline Quartz variety
Diamond in Kimberlite
Diamond (C in Kimberlite)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Red Jasper (beads)
Silicon Dioxide (SiO2) with iron inclusions
Sedimentary Rock
Quartz (milky quartz variety)
Quartz (SiO₂)
Mineral
Marble
Metamorphosed Limestone/Dolomite
metamorphic
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
Mineral
Lapis Lazuli
Complex metamorphic rock consisting mainly of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite
metamorphic
Quartz
Quartz (SiO₂ - Silicon Dioxide)
mineral
Sodalite (blue beads) and Clear Quartz (clear beads)
Sodalite: Na4Al3Si3O12Cl; Quartz: SiO2
mineral
Green Aventurine and Clear Quartz
Green Aventurine (Silicon Dioxide - SiO2 with Fuchsite inclusions); Clear Quartz (Silicon Dioxide - SiO2)
Mineral
Muscovite Mica
Muscovite (Potassium Mica) KAl2(AlSi3O10)(OH)2
Mineral
Quartz (Milky Quartz)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Greisen
Greisen
Metamorphic
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Diamond
Carbon (C)
mineral
Blue Chalcedony and Picture Jasper Beads
Blue Chalcedony (SiO2), Picture Jasper (SiO2)
Mineral