Pegmatite (with Muscovite Mica and Quartz)
Granitic Pegmatite (chiefly KAlSi3O8, SiO2, and KAl2(AlSi3O10)(OH)2)
igneous
Category
Man Made Mineral Simulant (Glass)
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Tumbled Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Quartz
Silicon dioxide (SiO2)
Mineral
Silicified fossil-bearing limestone (likely chert/agate replacement)
Microcrystalline quartz (SiO₂) replacing carbonate rock; possible fossiliferous limestone
sedimentary
Quartz (Granular)
Silicon Dioxide (SiO2)
mineral
Likely quartz cluster with iron staining
Quartz (SiO₂), possibly with calcite or feldspar inclusions
mineral
Quartz on Schist
Silicon Dioxide (SiO2) on Foliated Metamorphic Rock
metamorphic
Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Black Obsidian
Volcanic Glass (SiO2)
igneous
Quartz Geode (with possible Manganese or Goethite coating)
Silicon Dioxide (SiO2)
mineral
Milky quartz with iron-oxide staining
Quartz, silicon dioxide (SiO₂), likely massive or coarsely crystalline; brown areas are limonite/goethite staining
mineral
Green Fluorite (likely synthetic or heat-treated for jewelry)
Calcium Fluoride (CaF2)
mineral
Pegmatitic granite, possibly potassium-feldspar-rich
Coarse-grained granite; mainly quartz (SiO₂), potassium feldspar (KAlSi₃O₈), plagioclase, and biotite/hornblende
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Volcanic Glass (felsic volcanic glass with cristobalite inclusions)
igneous
Snowflake Obsidian
Volcanic Glass (spherulitic obsidian)
igneous
Obsidian
Volcanic Glass (Amorphous silicon dioxide with impurities)
igneous
Lepidolite
K(Li,Al)3(Al,Si,4)10(O,F,OH)2
mineral
Celestite
Celestine (SrSO4)
mineral
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Fluorite (Fluor-spar)
Calcium Fluoride (CaF2)
mineral
Potassium Feldspar (Orthoclase / Microcline)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Quartz geode
Microcrystalline and crystalline quartz (SiO₂), likely chalcedony-lined geode
mineral
Quartz (Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Tumbled blue chalcedony (likely blue quartz/chalcedony)
Cryptocrystalline silica, SiO₂; likely chalcedony, possibly dyed or surface-coated
mineral
Quartz-rich rock, possibly milky quartz or quartzite
Quartz (SiO₂), potentially quartzite if the grains are fused
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Quartz Geode or Vein Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Limonite/Hematite)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Spherulitic Obsidian (primarily SiO2)
igneous
Milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Amethyst (Raw Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral