Aura Quartz
Titanium/Titanium-Gold treated Silicon Dioxide (SiO2)
mineral
Category
Man Made Glass (Often Grouped With Minerals In Lapidary)
Browse man made glass (often grouped with minerals in lapidary) specimens identified by the Rock Identifier community.
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Brown Chert
Microcrystalline Quartz (SiO2)
sedimentary
Rutilated Quartz
Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions
mineral
Sandstone (with man-made markings)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Chert / Flint
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Jasper
Silicon Dioxide (SiO2)
sedimentary
Red Sandstone
Arenite (with Iron Oxide / Hematite staining)
sedimentary
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Raw pink feldspar (likely orthoclase or microcline)
Potassium feldspar, KAlSi₃O₈
mineral
K-Feldspar (Potassium Feldspar)
Potassium Feldspar (KAlSi3O8)
mineral
Lepidolite
K(Li,Al)3(Al,Si,4)10(O,F,OH)2
mineral
Man-made Metal Pin (Non-geological)
Antimony-Lead Alloy or Zinc/Brass Base with Electroplating
Metal Alloy / Manufactured Artifact
Chert (Yellow Jasper/Flint pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Yellow cabochon gemstone, likely citrine or yellow glass imitation
Quartz (SiO₂), if natural citrine; visual evidence is insufficient to exclude man-made glass or resin
gemstone
Cubic Zirconia (Man-made)
Cubic Zirconia (ZrO2) with Enamel and Metal Alloy
mineral
Pink Feldspar with Quartz
Potassium Feldspar (Orthoclase) with SiO2
igneous
Pink Feldspar
Orthoclase (KAlSi3O8)
igneous
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert / Flint
Silicon Dioxide (SiO₂)
sedimentary
Serpentinite
Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), with magnetite and remnants of olivine/pyroxene
metamorphic
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Chert (Black Chert or Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Garnet Beads
Garnet Group (complex nesosilicates, e.g., Almandine Fe3Al2(SiO4)3)
Mineral
Granite with Cupules / Bedrock Mortars
Granite (felsic intrusive plutonic rock)
igneous
Yellow Sapphire (Raw)
Corundum (Al2O3)
mineral
Tumbled brown chalcedony or agate
Microcrystalline quartz (SiO₂), likely chalcedony; possibly iron-stained jasper or agate
gemstone
Red Feldspar (Orthoclase)
Orthoclase Feldspar (KAlSi3O8)
mineral
Polished serpentine pebble
Serpentinite, chiefly serpentine-group minerals (chrysotile, lizardite, antigorite)
metamorphic
Potassium Feldspar
K-Feldspar (Orthoclase/Microcline) KAlSi3O8
mineral
Goldstone
Avventurina (Cu + SiO2 glass)
mineral
Tumbled pink feldspar (likely orthoclase or microcline)
Potassium feldspar — KAlSi₃O₈
mineral
Slag (Industrial Byproduct)
Ferro-silicate glass (Slag)
Anthropogenic (Man-made industrial deposit)
Terracotta (Man-made ceramic brick fragment)
Baked clay / High-iron ceramic (Silicate-based ceramic)
Anthropogenic material (Man-made sedimentary mimic)
Tumbled blue-green stone, likely chrysocolla or dyed chalcedony
Probable chrysocolla (hydrated copper aluminosilicate; variable composition), though appearance could also represent dyed chalcedony
mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
gemstone
Carved smoky quartz (likely)
Quartz, silicon dioxide (SiO₂), smoky variety
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Quartz with Spessartine Garnet and Biotite
SiO2 (Quartz) with Mn3Al2(SiO4)3 (Spessartine)
mineral
Goldstone
Not a natural mineral or rock. It is an ornamental glass.
Manufactured Glass (Simulant)
Polished yellow-green serpentine pendant
Serpentine-group minerals, chiefly antigorite and/or lizardite; approximate formula Mg3Si2O5(OH)4
metamorphic
Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)
Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)
mineral (synthetic)