Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Category
Minerals
Browse minerals specimens identified by the Rock Identifier community.
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Milky Quartz with Mineral Inclusions
Silicon Dioxide (SiO2) with miscellaneous inclusions
mineral
Obsidian
Amorphous volcanic glass (70-75% SiO2)
igneous
Limonite Concretion
Limonite (Hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)
sedimentary
Bauxite
AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary
Lapis Lazuli
Lapis Lazuli (Mineral composition: Lazurite, Calcite, Sodalite, and Pyrite)
metamorphic
Healer's Gold (Pyrite and Magnetite in Schist)
Magnetite (Fe3O4) and Pyrite (FeS2) in Mica Schist
metamorphic
Fossilized Shark Tooth
Carcharhinus sp. (likely Bull or Requiem shark family)
sedimentary
Epidosite (Unakite-related)
Epidosite (composed primarily of Epidote and Quartz)
metamorphic
Limonite/Goethite Gossan
FeO(OH)·nH2O (Hydrated iron oxide)
mineral
Strawberry Quartz (Red Aventurine)
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
mineral
Copper Ore (with Malachite and Azurite)
Hydroxide copper carbonate (Cu2CO3(OH)2 / Cu3(CO3)2(OH)2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Orthoclase Feldspar (Potassium Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Quartz Vein in Pelite (Metamorphic Rock)
Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)
metamorphic
Pink Halite (Himalayan Salt)
Halite (Sodium Chloride, NaCl)
sedimentary
Granite Pegmatite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Limonite/Goethite Nodule
Iron Oxyhydroxide (primarily FeO(OH)·nH2O)
mineral
Milky Quartz with Chlorite/Amphibite Inclusions
Silicon Dioxide (SiO2) with various mineral inclusions
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Quartz vein in Schist
Crystalline Silicon Dioxide (SiO2) in Metamorphic Host
metamorphic
Garden Quartz (Lodalite)
Silicon Dioxide (SiO2) with various inclusions
mineral
Fossilized Shark Tooth
Bioapatite (Calcium Hydroxyapatite) replacement
mineral
Amygdaloidal Basalt with Quartz/Calcite Inclusions
Amygdaloidal Basalt (SiO2 / CaCO3 inclusions)
igneous
Gneiss (specifically Micaceous Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and silicate minerals
sedimentary
Vesicular Basalt
Vesicular Basalt
igneous
Nephrite Jade (or Serpentine)
Nephrite (a variety of amphibole mineral tremolite-actinolite) or Serpentine Group minerals
Mineral/Rock
Larimar
Blue Pectolite (NaCa2Si3O8(OH))
mineral
Diamond
Carbon (C)
gemstone
Diorite
Diorite (plagioclase feldspar, biotite, and hornblende)
igneous
Epidote
Calcium aluminum iron silicate hydroxide (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheets with Quartz)
metamorphic
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Schist (Oxidized)
Mica Schist with Iron Oxide staining
metamorphic
Diamond
Diamond (Pure Carbon - C)
mineral
Banded Iron Formation (BIF)
Banded Iron Formation (Fe2O3 + SiO2)
sedimentary
Diamond
Diamond (C)
mineral
Granite
Intrusive Felsic Igneous Rock
igneous
Diamond
Carbon (C)
mineral
Diorite (Dalmatian Stone variant)
Intermediate Phaneritic Igneous Rock
igneous