Pumice
Pumice (a volcanic glass, primarily SiO2 with Al2O3)
igneous
Category
Non Geological
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Moldavite
Tektite (Amorphous Silica, SiO2 + Al2O3)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Cloudy variety)
Silicon Dioxide (SiO2)
mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Pyrite (Fools Gold)
Iron Sulfide (FeS2)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Obsidian
Volcanic Glass (felsic composition)
igneous
Diabase (Wormstone or Pebble)
Diabase (Dolerite)
igneous
Diorite (River Pebble)
Intermediate plutonic igneous rock
igneous
Pumice
Vesicular volcanic glass (primarily SiO2 with Al2O3)
Igneous
Quartz-veined Limestone
Sedimentary limestone with quartz/calcite veinlets
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Pumice
Pumice (Vesicular Felsic Igneous Rock)
igneous
Soil with Mineral Detritus and Quartz Fragments
Regolith / Silicate Mineral Aggregate
sedimentary
Banded Iron Formation
Banded Iron Formation (BIF)
sedimentary
Basalt
Mafic extrusive igneous rock
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz (Common or Milky)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon dioxide (SiO2)
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Crystal Fragment)
Quartz / Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Granite
Felsic intrusive igneous rock
igneous
Schist
Metamorphic Rock (Schist)
metamorphic
Porphyritic Basalt or Porphyry
Porphyritic Extrusive Igneous Rock
igneous
Granodiorite Core
Granodiorite
igneous
Chalcanthite (Likely Synthetic/Lab-Grown)
Hydrated copper(II) sulfate (CuSO4·5H2O)
mineral