Blue Celestite (with Galena)
Strontium sulfate (SrSO4) and Lead sulfide (PbS)
mineral
Category
Organic Mineral
Browse organic mineral specimens identified by the Rock Identifier community.
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Limonite (Ochreous)
FeO(OH)·nH2O (Hydrated Iron Oxide)
mineral
Schist
Mica Schist (primarily consisting of muscovite, biotite, and quartz)
metamorphic
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Green Aventurine
Aventurine Quartz (SiO2 + Fuchsite mica)
Mineral
Sandstone
Sandstone (lithified quartz arenite, arkose, graywacke, etc. depending on composition)
Sedimentary Rock
Hematite Beads
Hematite (Fe2O3)
Mineral
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Quartz (Riverstone / Cobble)
Silicon Dioxide (SiO2)
mineral
Schist
Mica Schist (primarily consisting of muscovite KAl2(AlSi3O10)(OH)2 or biotite K(Mg,Fe)3(AlSi3O10)(OH)2)
metamorphic
Sandstone (with potential trace fossils)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Limonite (Iron Ore)
Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O)
Mineral
Aventurine (likely Green Aventurine)
Quartz (SiO2) with included minerals (Fuchsite or Chlorite for green color)
Mineral
Chakra Stone Bracelet (mixed gemstones)
Multi-mineral/Gemstone assembly (primarily Quartz variety beads)
mineral
Schist
Mica Schist
metamorphic
Pink Granite
Felsic Plutonic Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)
Igneous
Moonstone (bead form)
Potassium Aluminum Silicate (KAlSi3O8) - a variety of Orthoclase Feldspar
Mineral
Gneiss
Gneiss
metamorphic
Serpentinite (often containing Jadeite/Nephrite)
Antigorite-rich Serpentine Rock, (Mg, Fe)3Si2O5(OH)4
metamorphic
Granite
Phaneritic Felsic Igneous Rock
igneous
Schist
Mica Schist
metamorphic
Basalt (Amygdaloidal)
Amygdaloidal Basalt
igneous
Pearl
Calcium Carbonate (primarily Aragonite and Calcite), CaCO3
mineral
Fluorite in Matrix
Fluorite (CaF2) within a host rock matrix
Mineral
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Pink Satin Spar (Satin Spar Selenite Dyed)
Gypsum (CaSO4·2H2O)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Gneiss
Gneiss
metamorphic
Selenite (Satin Spar)
Gypsum (CaSO4·2H2O)
mineral
Greenstone
Greenschist-facies basaltic rock
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt (Amygdaloidal)
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Sandstone (with Liesegang rings or joints)
Clastic Sedimentary Rock (primarily Quartz with Iron Oxide cement)
sedimentary
Rugose Coral (Horn Coral)
Order Rugosa (extinct fossilized coral)
sedimentary
Piddock bored rock (likely Mudstone or Shale)
Ichnofossil (Gastrochaenolites borings) in Fine-grained Sedimentary Rock
sedimentary
Moonstone (Feldspar)
Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8)
mineral
Banded Gneiss
Gneiss (pronounced "nice")
metamorphic
Pink Granite
Phaneritic Felsic Igneous Rock
igneous
Greenschist (Greenstone)
Chlorite schist (primarily Chlorite-Epidote-Actinolite-Albite)
metamorphic
Serpentine Schist with Quartz Vein
Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).
Metamorphic