Caliche (also known as hardpan, calcrete, kankar)
Primarily composed of calcium carbonate (CaCO₃), often mixed with other minerals like quartz, clay minerals, and iron oxides.
Mineral
Category
Mineral (Biogenic)
Browse mineral (biogenic) specimens identified by the Rock Identifier community.
Learn about Mineral (Biogenic) in the encyclopedia
View all →
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Fossilized Shark Tooth
Elasmobranchii (Class) fossil
fossil
Epidote
Epidote Group (e.g., Clinozoisite, Epidote, Piemontite), Epidote formula: Ca2(Al,Fe)3(SiO4)3(OH)
Mineral
Bornite
Bornite (Cu5FeS4)
mineral
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Pinkish-Orange Variety)
Crystalline Silicon Dioxide (SiO2)
mineral
Chert (Jasper/Flint Pebble)
Microcrystalline quartz (SiO2)
sedimentary
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Massive Quartz with Host Rock
Silicon Dioxide (SiO2)
mineral
Quartz / Quartzite
Silicon Dioxide (SiO2)
Mineral / Metamorphic
Quartz (Quarzite or Massive Quartz vein)
Silicon Dioxide (SiO2)
metamorphic
Green Aventurine (Green Quartzite)
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Crushed Stone / Gravel
Aggregatus saxum (variable mineral composition)
sedimentary
Milky Quartz with Chlorite/Amphibite Inclusions
Silicon Dioxide (SiO2) with various mineral inclusions
mineral
Granite
Granite (a felsic intrusive igneous rock composed primarily of quartz, feldspar, and mica)
igneous
Amazonite
Amazonite (KAlSi3O8 – a variety of Microcline, a Potassium Feldspar)
mineral
Schist
Mica Schist
metamorphic
Shale
Fissile mudstone (primarily clay minerals and silt-sized quartz)
sedimentary
Pegmatite (Granitic)
Granitic Pegmatite containing Quartz, Feldspar, and Tourmaline (Schorl)
igneous
Schist
Mica Schist
metamorphic
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
Mineral / Sedimentary
Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Feldspar, and Mica)
igneous
Garnet (specifically Almandine)
Almandine - Fe3Al2(SiO4)3
metamorphic
Psilomelane (Black Hematite varietal)
Barium Manganese Oxide (Ba,H2O)2Mn5O10
mineral
Schist
Mica Schist
metamorphic
Schist
Mica Schist
metamorphic
Bornite
Copper Iron Sulfide (Cu5FeS4)
mineral
Quartz Vein in Host Rock (often Granite or Schist)
Silicon Dioxide (SiO2) within host matrix
mineral with metamorphic or igneous host
Blue Lace Agate
Cryptocrystalline Quartz (SiO2) with trace minerals
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Quartz Vein in Rhyolite
Silicon Dioxide (SiO2) in extrusive igneous rock
igneous
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Tiffany Stone
Fluorite Opal (a complex mix of Fluorite, Opal, Calcite, Dolomite, Quartz, and Bertrandite)
mineral
Green Aventurine in Host Rock
Quartz (SiO2) with Fuchsite inclusions
mineral
Hypersthene
Hypersthene ((Mg,Fe)SiO₃)
Mineral
Basalt with Granite Inclusions (Xenoliths)
Mafic igneous rock (Basalt) with Sialic minerals
igneous