Diamond (in a jewelry setting)
Cubic Carbon (C)
mineral
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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River Cobble (Quartzite or Gneiss)
Metamorphic crystalline rock (predominantly SiO2 based)
metamorphic
Howlite
Howlite, Ca₂B₅SiO₉(OH)₅
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminium phosphate)
mineral
Polished pink banded agate
Microcrystalline quartz (chalcedony), SiO₂
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Rough Diamond
Diamond (pure Carbon, C)
mineral
Milky and Citrine-type Quartz
Silicon Dioxide (SiO2)
mineral
Yellow chalcedony (likely lemon quartz or citrine)
Cryptocrystalline silica, SiO₂; possible quartz variety
mineral
Painted Sandstone
Sandstone (clastic sedimentary rock) with acrylic/artistic coating
sedimentary
Slag
Ferrous Slag (Siliceous industrial waste)
Anthropogenic (Man-made industrial byproduct)
Emerald
Beryl (Be3Al2(SiO3)6)
gemstone
Shale or Mudstone
Argillaceous sedimentary rock
sedimentary
Citrine
Citrine (Silicon Dioxide, SiO2)
mineral
Amethyst (Rough Crystal)
Silicon Dioxide (SiO2) with iron impurities
mineral
Diamond
Carbon (C)
gemstone
Granite (Leucogranite)
Felsic Plutonic Rock (Granite)
igneous
Polished yellow jasper or opaque chalcedony bead
Microcrystalline quartz (SiO₂), likely iron-oxide-stained jasper
mineral
Amber
Succinite
mineral
Amethyst
Silicon dioxide with iron impurities (SiO2:Fe3+)
mineral
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Liesegang Rings (in Sandstone or Siltstone)
Ferruginous Sandstone with Liesegang Banding
sedimentary
Halite (Rock Salt)
Halite (Sodium Chloride, NaCl)
mineral
Green aventurine cabochon (likely)
Quartzite/aventurine quartz, predominantly SiO₂ with possible fuchsite mica
gemstone
Clear quartz cabochon
Quartz (silicon dioxide, SiO₂)
gemstone
Sandstone (likely Siltstone or fine-grained Sandstone)
Sedimentary Rock (Clastic)
sedimentary
Milky quartz pebble
Quartz (SiO₂), commonly called milky quartz
mineral
River Pebble (Sandstone / Quartzite)
Sedimentary rock (Quartz arenite / Quartzite pebble)
sedimentary
Dyed Agate Geode (Pink/Magenta)
Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Granite
Felsic intrusive igneous rock (Granite)
igneous
Pearl (as a biogenic mineral/gemstone)
Calcium Carbonate (mostly Aragonite), CaCO3
mineral
Red Sandstone
Arenite (SiO2 with Iron Oxide impurities)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Blue Sapphire (Raw)
Corundum (Al2O3)
mineral
Heat-Treated Amethyst (Commercial Citrine)
Silicon Dioxide (SiO2) - Macro-crystalline Quartz
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Picture Jasper
Impure variety of silica (SiO2)
sedimentary
Red Sandstone Pebble
SiO2 with Fe2O3 (Quartz sandstone with hematite coating)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Goethite
Goethite (FeO(OH))
mineral