Green Fluorite
Calcium Fluoride (CaF2)
Category
Browse mineral (impactite) specimens identified by the Rock Identifier community.
Green Fluorite
Calcium Fluoride (CaF2)
Schist
Schist; commonly mica schist, composed chiefly of muscovite/biotite mica with quartz and feldspar
Quartz-rich pegmatite (likely mica-bearing granite)
Granitic pegmatite; chiefly quartz (SiO₂), feldspar, and mica (muscovite/biotite)
Chrysocolla
Hydrated copper silicate - Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O
Sandstone
Clastic Sedimentary Rock
Note regarding baguette production (not a rock)
Digital text image - Somali language
Banded Gneiss Pebble
Gneiss (Metamorphic Rock)
Likely gneiss pebble
Gneiss, a foliated metamorphic rock composed mainly of quartz, feldspar, and mica
Granite pebble
Granite, chiefly quartz, feldspar, and mica
Weathered vesicular volcanic rock (likely basalt or andesite)
Amygdaloidal basalt/andesite; cavities may contain calcite, zeolites, or silica minerals
Tumbled or weathered gneiss
Feldspar–quartz–mica gneiss (composition variable)
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Extrusive volcanic rock)
Mixed Mineral Collection (Quartz, Amethyst, Rose Quartz, Pyrite, etc.)
Mixed Silicates and Sulfides (SiO2, FeS2)
Blue Apatite
Calcium phosphate mineral, Ca5(PO4)3(F,Cl,OH)
Likely lepidolite-bearing mica or purple fluorite
Lepidolite: K(Li,Al)3(Si,Al)4O10(F,OH)2; alternatively fluorite: CaF2
Vesuvianite (Idocrase)
Ca19(Al, Mg, Fe)13(SiO4)10(Si2O7)4(OH, F, O)10
Bornite
Bornite (Cu5FeS4)
Epidote with quartz/feldspar
Epidote, Ca2(Al,Fe)3(SiO4)3(OH)
Fossilized bone fragment, possibly vertebra
Fossil bone (mineralized hydroxyapatite; exact taxon indeterminate)
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and silicate minerals
Rainbow Fluorite
Fluorite (Calcium Fluoride, CaF2)
Magnetite (Lodestone variant potential)
Magnetite (Fe3O4)
Sandstone Pebble
Arenite (SiO2 based)
Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2
Sandstone Pebble
Arenite (SiO2 complex)
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Satin Spar (Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
Green Fluorite
Calcium Fluoride (CaF2)
Satin Spar (Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
Fluorite
Calcium fluoride (CaF2)
Pyrite
Iron Sulfide (FeS2)
Gneiss (probable)
Quartz–feldspar–mica gneiss; exact mineral composition cannot be confirmed from the image
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2) with Limonite/Goethite
Vanadinite
Pb5(VO4)3Cl
Polished Hematite Tower
Hematite (Fe2O3)
Chrysocolla (or Turquoise/Aventurine)
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O
Stalagmite (Flowstone)
Speleothem (Calcium Carbonate, CaCO3)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Quartz Geode Fragment
Silicon Dioxide (SiO2)
Azurite and Malachite on Matrix
Cu3(CO3)2(OH)2 (Azurite) and Cu2CO3(OH)2 (Malachite)
Possible mafic xenolith in granite
Dark mafic inclusion, likely amphibolite or gabbro, enclosed in coarse-grained granite