Wonderstone (Sandstone)
Liesegang Banded Sandstone (SiO2 dominated)
sedimentary
Category
Mineral Like (Natural Glass)
Browse mineral like (natural glass) specimens identified by the Rock Identifier community.
Learn about Mineral Like (Natural Glass) in the encyclopedia
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Quartz-veined Granite or Gneiss Pebble
Silicate-rich metamorphic rock fragment
metamorphic
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Dalmatian Stone
Peralkaline igneous rock containing quartz, feldspar, and arfvedsonite
igneous
Blue Obsidian
Volcanic Glass (SiO2 with inclusions)
igneous
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Dyed Pumice
Vesicular Rhyolite (Artificial Coloration Addition)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Snowflake Obsidian
Hydrated Volcanic Glass (primarily SiO2) with Cristobalite inclusions
igneous
Agate (Plume/Moss variety)
Cryptocrystalline Quartz (SiO2) with iron/manganese inclusions
mineral
Tumbled banded calcite (often sold as “onyx” or green onyx)
Calcite, CaCO₃; commonly banded cave/travertine calcite
mineral
Conglomerate
Conglomeratic Sandstone
sedimentary
Mineral Sand (Heavy Mineral Sand Concentrate)
Placer deposit concentrate containing minerals such as ilmenite, rutile, zircon, and magnetite
mineral
Chert (specifically Blue Chert/Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Diamond (or high-refractive faceted gemstone)
Carbon; C
mineral
Amethyst (in jewelry)
Silicon Dioxide (SiO2) with iron impurities
mineral
Turquoise (Tumbled/Polished)
Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O
mineral
Native Gold Nuggets
Native Gold (Au)
mineral
Amethyst Beads
Quartz (Silicon Dioxide, SiO2 with iron impurities)
gemstone
K2 Stone (or K2 Jasper)
Azurite-in-Granite (Potassium Feldspar, Quartz, Plagioclase, Muscovite, and Azurite)
igneous
Shale
Fissile mudstone (rich in clay minerals and quartz)
sedimentary
Potassium Feldspar (Orthoclase)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Shale
Clastic sedimentary rock (primarily clay and silt minerals)
sedimentary
K-Feldspar (Potassium Feldspar / Pink Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
White Agate / Chalcedony
Silicon Dioxide (SiO2)
gemstone
Turquoise in Matrix
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Black Onyx
Silicon Dioxide (SiO2)
mineral
Sandstone
Sandstone (lithified arenite/wacke)
Sedimentary Rock
Quartz (Milky to Clear)
Silicon Dioxide (SiO2)
mineral
Quartz (likely tumbled or naturally water-worn)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartz (Smoky or Clear variety with inclusions)
Silicon Dioxide (SiO2)
mineral
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Smoky quartz crystal/rough fragment
Quartz (SiO₂), likely smoky quartz
mineral
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
White seed-bead gemstone strand, likely freshwater pearl or shell pearl
Pearl: nacreous calcium carbonate, chiefly aragonite (CaCO₃) in conchiolin; identification uncertain from image
gemstone
Chert (Jasper variety) with Iron Oxide staining
Cryptocrystalline Quartz (SiO2) with Goethite/Limonite impurities
sedimentary
Sandstone with Iron Weathering
Quartz Arenite / Weathered Sandstone
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
River Rock (Basalt/Greywacke)
Aphanitic Basalt or Lithic Sandstone (Greywacke)
igneous
Yellow Quartz / Quartz Pebble
Silicon Dioxide (SiO2)
mineral