Fulgurite
Fulgurite (Lechatelierite-rich fused silica)
mineraloid
Category
Non Geological
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Ethiopian Opal (Welo Opal)
Hydrated Amorphous Silica (SiO2·nH2O)
mineraloid
Amber
Succinite (a variety of fossilized tree resin); chemical formula appx. C10H16O
mineraloid
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Tumbled brown quartzite or jasper
Quartzite (mostly SiO₂), possibly iron-rich jasper (microcrystalline quartz)
metamorphic
Dark volcanic rock, likely basalt
Basalt; predominantly plagioclase feldspar, pyroxene, and minor olivine or magnetite
igneous
Likely weathered gray flint/chert pebble
Microcrystalline quartz (SiO₂), commonly with chalcedony and minor impurities
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Amber
Fossilized Tree Resin
gemstone
Amber
Fossilized Tree Resin (Organic Polymer)
gemstone
Coal (Bituminous or Anthracite)
Carbonaceous Sedimentary Rock
sedimentary
Green Obsidian Sphere (man-made glass)
Vitreous Silica with Chromium/Iron additives
mineralogical simulant
Bivalve Internal Mold Fossil
Steinkern (Bivalvia mold)
fossil
Quartzite
Quartzite
metamorphic
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Granite
Phaneritic Plutonic Felsic Rock (KAlSi3O8 - SiO2 - NaAlSi3O8)
igneous
Quartzite
Quartzite
Metamorphic
Ferro-silicate Slag
Industrial Vitrified Slag (High-silica amorphous glass)
Mineral byproduct (Anthropogenic)
Obsidian
Obsidian (Volcanic Glass, ~70% SiO2)
igneous
Bauxite
Bauxite (Al2O3·2H2O mixed with iron oxides)
sedimentary
Shale
Lutaceous sedimentary rock
sedimentary
Metaconglomerate
Metaconglomerate (Quartzite conglomerate)
metamorphic
Fire Opal
Hydrated amorphous silica (SiO2·nH2O)
gemstone
Amber
Fossilized tree resin (Amorphous organic polymer)
gemstone
Tektite
Natural impact glass
meteorite
Quartzite (with inclusions)
SiO2 (Silicon Dioxide) rich Metamorphic Rock
metamorphic
Amber
Fossilized Tree Resin (Generic formula roughly C10H16O)
mineral
Snowflake Obsidian
Vitreous Volcanic Glass (Siliceous Obsidian with Cristobalite inclusions)
igneous
Quartzite River Cobble
Quartzite (SiO2)
metamorphic
Amber
Succinite (specifically for Baltic amber); Approximate formula: C10H16O
Organic Gemstone (Mineraloid)
Quartzite
Quartzite (primarily SiO2)
metamorphic
Fuchsite Quartzite (Green Quartzite)
Fuchsite-bearing Quartzite (K(Al,Cr)2(AlSi3O10)(OH)2 + SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble (River Rock)
Metamorphic Quartzite (predominantly SiO2)
metamorphic
Pumice
Pumice (a highly vesicular volcanic glass)
igneous
Limestone Breccia
Sedimentary Breccia (Calcareous)
sedimentary
Quartzite (River Pebble)
Metamorphosed Quartz Sandstone (primarily SiO2)
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic