Amethyst
Amethyst (Silicon Dioxide, SiO2 with Iron impurities)
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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Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Blue druzy quartz cluster
Quartz, SiO₂; blue coloration likely from inclusions or surface treatment
mineral
Amethyst (Quartz Cluster)
Silicon Dioxide (SiO2) with iron impurities
mineral
Slag Glass / Industrial Slag
Anthropogenic Glass
man-made glass / industrial byproduct
Amethyst
Silicon dioxide (variant with ferric iron impurities), SiO2
mineral
Tumbled orange quartz (likely citrine or iron-stained quartz)
Quartz, silicon dioxide (SiO₂), possibly Fe³⁺-colored citrine
mineral
Quartz (Smoky/Druzy variety)
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
sedimentary
Blue Goldstone
Goldstone (artificial glass)
Mineral (man-made glass, not natural)
Amethyst geode slice
Quartz (SiO₂), purple variety amethyst, with banded chalcedony/agate
mineral
Yellow Quartz / Chalcedony
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Cubic Zirconia (CZ)
Zirconium dioxide (ZrO2)
mineral
Jasper and Quartz Pebble
Silicon Dioxide (SiO2) microcrystalline quartz variety
sedimentary
Shale
Shale (claystone/mudstone)
sedimentary
Sandstone (with Possible Iron Staining/Crust)
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Tumbled amethyst
Quartz, purple variety; silicon dioxide (SiO₂), colored mainly by iron impurities and irradiation
mineral
Amethyst
Silicon dioxide (SiO2)
mineral
Raw smoky quartz with dark mineral inclusions
Quartz (SiO₂), likely smoky quartz; dark inclusions may be chlorite, tourmaline, or iron/manganese oxides
mineral
Strawberry Quartz (Red Aventurine)
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
mineral
Tumbled agate (likely Botswana or fortification agate)
Microcrystalline quartz, SiO₂ (chalcedony with banded impurities)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Blue Goldstone
Synthetic Avanturine Glass (or Aventurine Glass)
Synthetic Glass
Unidentified gray metallic object
Not determinable from the image; likely a metal screw or manufactured fastener rather than geological material
mineral
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Botryoidal chalcedony with druzy quartz (possibly aragonite/calcite cavity fill)
Microcrystalline quartz, SiO₂; associated carbonate minerals may be calcite (CaCO₃) or aragonite (CaCO₃)
mineral
Emerald
Beryl (Be3Al2Si6O18) with trace amounts of Chromium and/or Vanadium
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with natural radiation induced color centers
mineral
Amethyst cluster
Amethyst, purple quartz (SiO₂)
mineral
Almandine Garnet & Tumbled Citrine Quartz
Fe3Al2(SiO4)3 (Garnet) and SiO2 (Quartz)
mineral
Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Tumbled citrine (likely heat-treated amethyst or quartz)
Quartz, SiO₂; yellow coloration from iron impurities or irradiation/heat treatment
mineral
Green Aventurine
Silicon Dioxide (Quartz variety) with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Sandstone (Quartzose)
Arenite (SiO2 principal)
sedimentary
Quartz (Orangey-Yellow variety)
Silicon Dioxide (SiO2)
mineral
Blue slag glass / industrial glass fragment
Artificial silicate glass, composition variable; likely copper- or cobalt-colored furnace slag
mineral
Amethyst
Amethyst (SiO2 - Silicon Dioxide with iron impurities)
mineral