Red Slag Glass
Amorphous Silica (Industrial byproduct with metallic oxide dopants)
Mineraloid / Industrial Byproduct
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Chalcedony (Agate/Carnelian)
Silicon Dioxide (SiO2)
mineral
Garnet
Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)
mineral
Sandstone
Arenite
sedimentary
Ferruginous Sandstone (River Pebble)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Grey Banded Agate
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz with Iron Inclusion
Silicon Dioxide (SiO2)
mineral
Mica Schist
Mica Schist (predominantly Muscovite KAl2(AlSi3O10)(OH)2 and Quartz SiO2)
metamorphic
Diamond
Carbon (C)
mineral
Sapphire
Corundum (Al2O3)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Pumice
Pumice (a highly vesicular volcanic glass)
igneous
Mixed Tumbled Rocks and Minerals Collection
Mixed Minerals and Rocks (Quartz, Feldspar, Jasper, Agate, Lapis Lazuli, Sodalite, Rose Quartz, Fluorite, etc.)
mineral
Pink Cubic Zirconia (CZ)
Zirconium Dioxide (ZrO2)
mineral (synthetic)
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Pumice
Pumice (a highly vesicular extrusive volcanic rock)
igneous
Coal
Bituminous or Anthracite Coal
sedimentary
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Gneiss (Metamorphosed Pebble)
Gneiss with Quartz/Feldspar banding
metamorphic
Mixed Quartz Bracelet (Rose Quartz and Larimar-colored beads)
Silicon Dioxide (SiO2) with various inclusions
mineral
Schist (Micaceous Schist)
Schist (containing mainly Muscovite and Quartz)
metamorphic
River Cobble (likely Serpentinite or Greenstone)
Serpentinite / Greenschist facies rock
metamorphic
Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
mineral
Coal (Anthracite / Bituminous)
Organic Sedimentary Rock (Carbon-based)
sedimentary
Basalt with Quartz/Calcite Veins
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Pegmatite
Igneous Pegmatite (felsic intrusive rock)
igneous
Basalt
Basalt (Mafic igneous rock)
igneous
Basalt with Quartz/Calcite Veins
Aphanitic Mafic Igneous Rock (Hydrothermal Veined)
igneous
Gypsum (Wallboard/Drywall)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
sedimentary
Chert (and Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Host Rock
Hydrothermal Quartz (SiO2) in Slates/Schists
metamorphic
Flint
Cryptocrystalline quartz (SiO2)
sedimentary
Milky Quartz with Iron Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Milky or Cloudy variety)
Quartz (Silicon Dioxide, SiO2)
mineral
Fossilized bivalve shell
Bivalvia (likely a venerid or similar clam); shell composed mainly of CaCO₃ as aragonite/calcite
fossil
Chalcedony (Agate/Carnelian)
Cryptocrystalline Quartz (SiO2)
mineral
Yellow Diamond (Faceted)
Diamond (C - Pure Carbon)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Black Tourmaline (Schorl)
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)
mineral
Olivine (Peridotite)
(Mg, Fe)2SiO4 (Magnesium Iron Silicate)
igneous