Citrine Quartz (or Heat-Treated Amethyst / Smoky Quartz)
Silicon Dioxide (SiO2)
gemstone
Category
Mineral Like (Natural Glass)
Browse mineral like (natural glass) specimens identified by the Rock Identifier community.
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Bauxite (Pisolitic Bauxite)
Bauxite (mixture of Hydrous Aluminum Oxides)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Chert (Yellow Jasper)
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Blue Crackle Quartz (Dyed Fire Agate/Quartz)
Silicon Dioxide (SiO2) with artificial dye treatment
mineral
Diamond
Carbon (C)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (with Iron concretions/staining)
Arenite (composed primarily of Quartz and Feldspar with Iron Oxide cement)
sedimentary
Quartzite with inclusions or a banded chert
Quartzite or Chert
Metamorphic or Sedimentary
Smoky Quartz on Matrix
Silicon Dioxide (SiO2) with trace impurities and aluminum inclusions
mineral
Sandstone
Sandstone (SiO2 dominated)
sedimentary
Mixed rock and mineral collection
Mixed lithologies; likely quartz, feldspar, basalt, granite, chert, sandstone, and metamorphic rocks
igneous, sedimentary, metamorphic, mineral
Yellow Quartz (Citrine Quartz or Yellow Jasper)
Silicon Dioxide (SiO2) with iron impurities
mineral
Goldstone
Aventurine Glass (Man-made glass with copper inclusions)
mineraloid / man-made glass
Sandstone
Arenite (clastic sedimentary rock)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Sandstone
Clastic sedimentary rock (quartz arenite)
sedimentary
Yellow Quartz (Citrine/Lemon Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite Beach Pebble
Quartzite (primarily SiO2)
metamorphic
Small pale mineral fragment
Unidentified; possibly quartz, calcite, or feldspar
mineral
Red Quartzite Pebble
Quartzite (SiO2)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Tektite (Indochinite)
Tektite (High-silica natural glass)
mineraloid
Diamond
Diamond (C)
mineral
Diamond
Carbon (C)
mineral
Amethyst Elestial Quartz
Silicon Dioxide with inclusions (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with impurities of Fe3+)
mineral
Composite Turquoise or Reconstituted Turquoise with Copper inclusions
CuAl6(PO4)4(OH)8·4H2O (Turquoise) mixed with matrix and copper/bronze flakes
mineral
Quartz Veined Quartzite or Sandstone
Quartzite with Quartz Veins (SiO2)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
gemstone
Blue Goldstone
Synthetic Aventurescent Glass (Cobalt-doped soda-lime glass)
man-made glass
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Yellow Quartz (Citrine Quartz or Yellow Chalcedony)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Pumice
Vesicular Rhyolite or Trachyte (High-silica volcanic glass)
igneous
Aquamarine
Beryl (Be₃Al₂Si₆O₁₈), specifically a blue or cyan variety
Mineral
Sandstone
Arenite (SiO2 principal composition)
sedimentary
Goldstone (Red)
Aventurine Glass (SiO2 + Cu)
Synthetic Glass (Often categorized as a simulated mineral)
Chert
Cryptocrystalline Quartz (SiO2)
sedimentary
Amethyst
Quartz (Silicon Dioxide with Iron impurities), SiO2
mineral
Granite Pebble
Granite; primarily composed of Quartz (SiO2), Feldspar (KAlSi3O8), and Mica
igneous
Banded Agate (Onyx type)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral