Man Made Byproduct (Non Geological)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Sandstone

Arenite (SiO2 primarily)

Milky Quartz (Stained with Iron)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon dioxide (SiO2)

Sandstone

Arenite (SiO2 based)

Quartz Mineral

Silicon Dioxide (SiO2)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 primarily)

Chert (Common Variety, Jasper)

Microcrystalline Quartz (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sandstone (Fossiliferous)

Clastic Sedimentary Rock (primarily SiO2)

Iron-stained Quartzite

Recrystallized Quartz (SiO2) with Hematite/Limonite staining

Quartz (Variety: Citrine or Tumbled Chalcedony)

Silicon Dioxide (SiO2)

Sedimentary / Metamorphic

Jasper (Iron-rich Chalcedony)

Jasper (Microcrystalline Silicon Dioxide, SiO2 plus iron oxide impurities)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (SiO2 with Fe2O3 inclusions)

Chert (often called Flint in archaeological contexts)

Silicon Dioxide (SiO2)

Granite

Granite (Mainly Quartz SiO2, Feldspar KAlSi3O8, and Mica KAl2(AlSi3O10)(OH)2)

Igneous

Dendritic Opal

Dendritic Common Opal (SiO2·nH2O with Manganese oxide inclusions)

Quartz (Milky/Granular)

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Diabase (Greenstone)

Diabase (also known as Dolerite)

igneous

Granite

Phaneritic Felsic Igneous Rock

igneous

Granite

Phaneritic Felsic Igneous Rock

igneous

Quartz (specifically Clear Quartz or Rock Crystal)

Silicon Dioxide (SiO2)

River Pebble (Gneiss or Quartzite variant)

Course-grained Metamorphic Rock (likely SiO2 dominant)

Quartzite (with Metamorphic Foliation)

Quartzite (Recrystallized SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Blue Chalcedony

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Quartz / Clear Quartz

Silicon Dioxide (SiO2)

Chert (with Limestone matrix)

Silicon dioxide (SiO2)

Sandstone

Arenite (SiO2 based)