Quartz-veined Granite or Gneiss Pebble
Silicate-rich metamorphic rock fragment
metamorphic
Category
Man Made Silicate (Anthropogenic Glass)
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Snowflake Obsidian
Vitreous volcanic silicate (SiO2 with Cristobalite inclusions)
Igneous
Chert
Microcrystalline silica (SiO2)
sedimentary
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Flint / Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and Agate/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Goldstone and Aura Quartz
Cuprous Glass (Goldstone) and Titanium-coated SiO2 (Aura Quartz)
Mineral/Glass Specimen
Pegmatitic quartz–feldspar rock with dark mica
Granitic pegmatite; quartz (SiO₂), feldspar, and biotite mica
igneous
Mica / Muscovite or Biotite
Phyllosilicate mineral group (e.g., KAl2(AlSi3O10)(OH)2)
mineral
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Obsidian
Obsidian (Volcanic Glass)
igneous
Quartzite
Silica (SiO2) quartzite
metamorphic
Snowflake Obsidian
Vitreous volcanic silicate (SiO2 with Cristobalite inclusions)
igneous
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Red Quartzite
Quartzite (Metamorphosed Quartz Arenite)
metamorphic
Polished smoky quartz crystal point
Quartz (SiO₂), likely iron-colored or smoky quartz with milky inclusions
mineral
Quartz (Milky or Rose variety)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint / Jasper)
Silicon Dioxide (SiO2)
sedimentary
Quartz with Tourmaline or Amphibole
Silicon Dioxide with silicate inclusions (SiO2)
mineral
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Carnelian cabochon pendant
Carnelian, orange-red chalcedony (microcrystalline quartz, SiO₂)
gemstone
Sandstone (Ferruginous)
Arenite with Iron oxide staining (SiO2 with Fe2O3)
sedimentary
Heart-shaped faceted gemstone pendant
Likely yellow quartz (citrine) or synthetic yellow stone, set in metal with small clear accent stones
gemstone
Granitoid (Granite/Gneiss)
Granitoid silicate rock, primarily quartz and feldspar
igneous/metamorphic
Sandstone
Arenite
sedimentary
Green Jasper
Silicon dioxide (SiO2)
sedimentary
Aragonite
Aragonite (Calcium Carbonate - CaCO3)
mineral
White cabochon gemstone, likely milky chalcedony or opalite
Chalcedony: microcrystalline quartz, SiO₂; appearance may also indicate synthetic opalite glass
gemstone
Blue Topaz
Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)
gemstone
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Polished black stone sphere (likely black basalt or black tourmaline)
Most likely fine-grained basalt (plagioclase–pyroxene); mineral identification is uncertain from the image alone
igneous
Green Aventurine
SiO2 (Silicon Dioxide with inclusions of Fuchsite mica)
mineral
Small quartz-rich pebble
Quartz (SiO₂), possibly quartzite or weathered granite fragment
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Botryoidal chalcedony with iron-oxide staining
Microcrystalline quartz (SiO₂), likely iron-oxide-bearing chalcedony
mineral
Jasper with Hematite inclusions
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
sedimentary
Blue-gray tumbled stone, likely labradorite or blue-gray feldspar
Plagioclase feldspar, possibly labradorite (NaAlSi₃O₈–CaAl₂Si₂O₈)
mineral
Smoky Quartz
Smoky Quartz (SiO2)
mineral