Limestone
Calcium Carbonate (CaCO3)
sedimentary
Category
Mineral, Often A Rock Given Its Aggregate Nature
Browse mineral, often a rock given its aggregate nature specimens identified by the Rock Identifier community.
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Banded Agate (Agate Slice)
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Halite (Rock Salt)
Halite; NaCl (Sodium Chloride)
Mineral
Chrysocolla (in Host Rock)
Hydrated copper silicate - Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O
mineral
Sandstone
Sandstone (composed mainly of Quartz, SiO2, and Feldspar)
sedimentary
Yellow Jasper
Silicon Dioxide with Limonite/Goethite inclusions (SiO2)
sedimentary
Shale
Shale (clay-rich mudstone)
sedimentary
Diamond
Diamond (carbon allotrope), C (chemical formula)
Mineral
Chrysoprase
Chalcedony (cryptocrystalline SiO2 variety)
Mineral
Alabaster
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
sedimentary
Jasper
Silicon dioxide (Microcrystalline quartz, SiO2)
sedimentary
Dragon Vein Agate
Chalcedony (Quartz) - SiO2
mineral
Porphyritic Basalt or Porphyritic Andesite
Porphyritic Extrusive Igneous Rock
igneous
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
gemstone
Pyrite in Host Rock
Iron Disulfide (FeS2)
mineral
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary
Basalt with Plagioclase Phenocrysts
Porphyritic Basalt
igneous
Honey Calcite (Yellow Calcite)
Calcium Carbonate (CaCO3)
mineral
Limestone
Limestone (CaCO3)
sedimentary
Chrysoprase
Chalcedony (cryptocrystalline quartz) with nickel inclusions; SiO2
Mineral
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Scoria
Scoria (a vesicular basalt or andesite)
igneous
Green Quartz (Prasiolite)
Silicon Dioxide (SiO2) with trace impurities
mineral
Lava Rock (Dyed)
Basalt / Volcanic scoria
igneous
Basalt Pebble
Extrusive Mafic Igneous Rock
igneous
Sandstone
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Cat's Eye Moonstone (Simulated/Synthetic or natural Cat's Eye Quartz/Glass)
There is no single scientific name. The appearance suggests either: Moonstone (feldspar group), Cat's Eye Quartz (SiO2), Apatite (Ca5(PO4)3(F,Cl,OH)), or most likely a synthetic material such as Fiber Optic Glass or 'Opalite' (a type of glass).
Mineral
Chrysocolla
Hydrated copper silicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Lapis Lazuli
(Na,Ca)8(AlSiO4)6(SO4,S,Cl)2 (Complex silicate rock)
rock
Gold Ore (in Quartz/Gossan matrix)
Native Gold (Au) in Limonite/Quartz matrix
mineral
Red Jasper (Mookaite style)
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Agate (Grey Agate Slice)
Microcrystalline Quartz (SiO2)
mineral
Crushed Rock (Basalt)
Basalt (Aphanitic Mafic Igneous Rock)
Igneous
Barite Rose
Barium Sulfate (BaSO4)
mineral
Chert (Jasper) Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite or Chalcopyrite specimen (Gold-colored mineral coating)
Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)
mineral
Green Druzy Quartz (Prasiolite)
Silicon Dioxide (SiO2) with inclusions (typically Chlorite or Actinolite)
mineral
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and organic impurities
sedimentary
N/A (Non-Geological Specimen)
N/A
Sandstone
Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)
Sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary