Amethyst
Quartz (Silicon Dioxide with Iron impurities), SiO2
gemstone
Category
Mineral_rock
Browse mineral_rock specimens identified by the Rock Identifier community.
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Quartz (Citrine variety)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
Sedimentary
Granite
Plutonic Igneous Rock
igneous
Granite
Intrusive igneous rock
igneous
Granite
Intrusive Igneous Rock
igneous
Vesicular Basalt or Porphyritic Rhyolite
Extrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Shale (or Mudstone)
Clay mineral aggregate / Fine-grained siliciclastic sedimentary rock
sedimentary
Chalcanthite
Copper(II) sulfate pentahydrate (CuSO4·5H2O)
mineral
Chrysocolla
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Satin Spar (often marketed as Selenite)
Gypsum (CaSO4·2H2O)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Ironstone Concretion (Ironstone Gourd)
Limonite/Goethite Concretion (FeOO(H))
sedimentary
Serpentinite (often called Jade or Nephrite substitute)
Serpentinite (composed primarily of Antigorite, Lizardite, or Chrysotile)
metamorphic
Pumice
Pumice (volcanic rock)
Igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within metamorphic/igneous matrix
igneous/metamorphic
Quartz cluster, possibly druzy quartz on matrix
Quartz (SiO₂), likely microcrystalline to coarse crystalline; associated matrix uncertain
mineral
Dyed Agate Slice
Silicon Dioxide (SiO2)
mineral
Clear Quartz Crystal (Herkimer Diamond style)
Silicon Dioxide (SiO2)
mineral
Banded Agate (Polished Slice)
Chalcedony (cryptocrystalline Quartz), SiO2
mineral
Sandstone
Arenite (specifically Quartz Arenite)
sedimentary
Sandstone
Arenite (typically SiO2 + others)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Lapis Lazuli
Lapis Lazuli (Complex aggregate containing Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)
metamorphic
Quartz pebble with calcite
Silicon dioxide (SiO2) with Calcium carbonate (CaCO3)
sedimentary
Shale
Shale (Consolidated fine-grained clay/silt)
sedimentary
Moonstone
Orthoclase feldspar ((K,Na)AlSi3O8)
mineral
Mica Schist
Schist (muscovite-biotite schist)
metamorphic
Selenite (Satin Spar)
Gypsum (CaSO4·2H2O)
mineral
Unakite
Altered Granite (Granitic Metamorphic Rock)
metamorphic
Satin Spar (Satin Spar Selenite)
Gypsum (CaSO4·2H2O)
mineral
Blue Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
Psilomelane (Black Hematite varietal)
Barium Manganese Oxide (Ba,H2O)2Mn5O10
mineral