Talc
Talc (Mg₃Si₄O₁₀(OH)₂)
Mineral
Category
Mineral (Man Modified)
Browse mineral (man modified) specimens identified by the Rock Identifier community.
Opalite
Man-made synthetic glass with opalescent effects (SiO2 + metal oxides)
mineraloid
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) containing trace amounts of titanium, iron, or manganese
mineral
Rose Quartz
Quartz (Silicon Dioxide - SiO2) with trace amounts of titanium, iron, or manganese
mineral
Howlite and Purpurite druzy
Calcium Borosilicate Hydroxide (Howlite) and Manganese Phosphate (Purpurite)
mineral
Fossilized Wood (Petrified Wood)
Silicified Wood (primarily quartz/chalcedony replacing organic matter)
Sedimentary (with some aspects of mineral replacement)
Rose Quartz
Rose Quartz (SiO2)
Mineral
Red Jasper
Jasper (a variety of Chalcedony, SiO₂ with iron oxide inclusions)
Mineral
Leopard Skin Jasper
Chalcedony (cryptocrystalline quartz) with inclusions
Mineral
Banded Agate (variety of Chalcedony)
Agate (SiO2)
mineral
Quartz (River-worn Pebble)
Quartz (SiO2)
Mineral
Crystal Quartz Beads (likely Clear Quartz)
Quartz (SiO₂)
Mineral
Strawberry Quartz
Quartz (SiO2) with inclusions of Goethite or Hematite
Mineral
Citrine Geode (or Druzy Citrine)
Silicon Dioxide (SiO₂) - a variety of Quartz
Mineral
Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Red Jasper (beads)
Silicon Dioxide (SiO2) with iron inclusions
Sedimentary Rock
Epidote (or Epidote-rich rock)
Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).
Mineral, often found in metamorphic rocks but also in sedimentary and igneous rocks
Silver (Native Element)
Ag (Argentum)
mineral
Rose Quartz
Quartz (Silicon Dioxide, SiO2) with trace amounts of titanium, iron, or manganese
mineral
Rose Quartz
Quartz (Silicon Dioxide - SiO2) with trace impurities of Titanium, Manganese, or Iron
mineral
Sandstone
Quartz Arenite (a type of sandstone composed of more than 90% quartz)
Sedimentary Rock
Granite
Granite (a felsic intrusive igneous rock)
igneous
Sandstone
Arenite (general term for sandstone)
Sedimentary Rock
Sandstone
Sandstone (clastic sedimentary rock)
Rock
Kyanite
Kyanite (Al2SiO5)
Mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Clear Quartz (or Rock Crystal)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartz
Silicon Dioxide (SiO₂)
Mineral
Shale
Shale (fine-grained clastic sedimentary rock)
Sedimentary
Banded Agate (specifically Botryoidal/Orbicular Agate)
Silicon Dioxide (SiO2)
Mineral (variety of Chalcedony/Quartz)
Granite
Granite (a plutonic igneous rock)
Igneous
Banded Iron Formation (BIF)
Banded Iron Formation
Sedimentary Rock
Quartz (in matrix)
Quartz (SiO₂)
mineral
Quartz
Quartz (SiO2)
Mineral
Quartz (Druzy) in host rock
SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)
Mineral
Moonstone
Adularia (orthoclase) or Albite (plagioclase), a feldspar mineral (KAlSi3O8 or NaAlSi3O8 respectively, often a mixture)
mineral
Black Chert
Chert (microcrystalline quartz)
Mineral
Iron Meteorite
Iron-nickel alloy (primarily kamacite and taenite)
Meteorite (extraterrestrial material)
Banded Gneiss (River Cobble)
Gneiss (a high-grade metamorphic rock)
metamorphic
Banded Iron Formation
Banded Iron Formation (BIF)
Sedimentary Rock
Red Jasper (with Quartz Veins)
Jasper (var. chert, SiO₂)
Sedimentary Rock (technically chert, a microcrystalline quartz)