Sillimanite
Al2O3(SiO2)
mineral
Category
Manufactured Stone
Browse manufactured stone specimens identified by the Rock Identifier community.
Smelter Slag
Anthropogenic Silicate Slag
igneous
Yellow Fluorite
Calcium Fluoride (CaF2)
mineral
K-Feldspar (Microcline / Orthoclase)
Potassium Feldspar (KAlSi3O8)
mineral
Blue Apatite
Fluorapatite / Apatite Group Ca5(PO4)3(F,Cl,OH)
mineral
Quartz (Clear Quartz / Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Chlorite / Mica inclusions
Silicon Dioxide (SiO2) with phyllosilicate inclusions
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (with Sandstone/Quartzite rocks)
Silicon Dioxide (SiO2)
mineral
Cleavable Calcite
Calcium Carbonate (CaCO3)
mineral
Limestone
Calcite (CaCO3)
sedimentary
Dead Sea Salt Crust
Halite (NaCl)
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Sea Snail Shell (Top Shell)
Trochidae family (Calcium Carbonate, CaCO3)
mineral
Quartz (Orangey-Yellow variety)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Fe2O3 (Hematite/Limonite) inclusions
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Selenite (Satin Spar Variety)
Gypsum (CaSO4·2H2O)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz Point
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Fragment
Silicon Dioxide (SiO2)
mineral
Coal
Anthracite or Bituminous Coal
sedimentary
Limonite (Yellow Ochre)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Clear Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Quartz with Chalcopyrite (or Pyrite)
Silicon Dioxide (SiO2) with Copper Iron Sulfide (CuFeS2)
mineral
Gypsum (Satin Spar / Alabaster variety)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Obsidian
Obsidian (Volcanic Glass, SiO2 > 70%)
igneous
Sandstone (Ferruginous)
Arenite (with Iron Oxides)
sedimentary
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Bituminous Coal
Organic Sedimentary Rock (composed mostly of carbon with sulfur and hydrogen)
sedimentary
Shale
Shale (composition varies: primarily clay minerals and quartz)
sedimentary
Optical Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in Geode form
sedimentary
Smoky Quartz
Silicon Dioxide (SiO₂)
mineral