Snowflake Obsidian
Volcanic glass with Cristobalite inclusions (mostly SiO2)
igneous
Category
Manufactured Glass
Browse manufactured glass specimens identified by the Rock Identifier community.
Obsidian
Obsidian (principally SiO2 - Silicon Dioxide)
igneous
Ferrous Slag (Iron Smelting By-product)
Fused Siliceous Slag
Anthropogenic Material (Man-made Rock)
Mica Schist
Foliated Metamorphic Rock (Schist)
metamorphic
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Rainbow Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Satin Spar (Gypsum variety)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt (River Pebble)
Extrusive mafic igneous rock
igneous
Mica Schist
Mica Schist (Complex Silicate Rock)
metamorphic
Shale or Siltstone
Sedimentary Rock (Siliciclastic)
sedimentary
Satin Spar Selenite
Gypsum (CaSO4·2H2O)
mineral
Fluorite (Blue)
Calcium Fluoride (CaF2)
mineral
Halite (Rock Salt)
Halite (Sodium Chloride, NaCl)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Green Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite (Iron Pyrite)
Iron Disulfide (FeS2)
mineral
Red Shale
Fissile Siliciclastic Sedimentary Rock
sedimentary
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Rainbow Fluorite
Calcium Fluoride (CaF2)
mineral
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(OH)2
mineral
Banded Iron Formation (BIF)
Banded Iron Formation (Fe2O3 + SiO2)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Red Shale
Lutite (primarily composed of clay minerals and iron oxides like hematite, Fe2O3)
sedimentary
Pink Fluorite
Fluorite (Calcium Fluoride) - CaF2
mineral
Green Kyanite
Kyanite (Al2SiO5)
mineral
Basalt
Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone (Weathered)
Calcium Carbonate (CaCO3)
sedimentary
Biotite (Black Mica)
K(Mg,Fe)3AlSi3O10(OH,F)2
mineral
Basalt (River Pebble)
Basalt (Aphanitic Mafic Volcanic Rock)
Igneous
Basalt
Extrusive Mafic Igneous Rock
igneous
Obsidian with Mahogany Phasing
Volcanic Glass (SiO2 + Fe2O3)
igneous
Muscovite Mica
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
metamorphic