Quartz with Mica/Host Rock
Silicon Dioxide (SiO2) with Phyllosilicates
mineral
Category
Mineral And Glass
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Blue lace agate (tumbled)
Microcrystalline quartz, SiO₂ (chalcedony variety)
mineral
Quartz Chip
Silicon Dioxide (SiO2)
mineral
Banded Agate
Silicon dioxide (SiO2) - variety of Chalcedony
sedimentary
Quartz Pebble
Crystalline Silica (SiO2)
mineral
Sandstone with Concretions / Liesegang Rings
Arenite with iron oxide banding
sedimentary
Chert Nodules in Limestone
Microcrystalline Quartz (SiO2) in Carbonate Matrix
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Quartz (Smoky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian and Green Aventurine
Volcanic Glass (SiO2 with Cristobalite inclusions) and Quartz (SiO2 with Fuchsite)
igneous and metamorphic
Sandstone (likely Arkose or Lithic)
Clastic sedimentary rock (SiO2 + impurities)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxides
sedimentary
Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass)
Igneous
Milk Quartz (White Quartz)
Silicon Dioxide (SiO2)
mineral
Mahogany Obsidian
Obsidian with Hematite inclusions (SiO2 + Fe2O3)
igneous
Quartz with Chalcopyrite (or Pyrite)
Silicon Dioxide (SiO2) with Copper Iron Sulfide (CuFeS2)
mineral
Quartz (Orange/Pink variety)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Quartz Sand
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Chatoyant or Milky variety)
Silicon Dioxide (SiO2)
mineral
Milky Quartz in Shale
Silicon Dioxide (SiO2) in sedimentary host rock
mineral
Fulgurite
Fulgurite (Lechatelierite/Silica glass)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Feldspar
Aluminosilicate (KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8)
mineral
Black Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Agate Nodule / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Granite
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral