Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Category
Mineral And Glass
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Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Citrine (Yellow Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Libyan Desert Glass
Impactite (High-silica tektite)
mineral
Sandstone
Arenite (Silicon Dioxide with various mineral cements)
sedimentary
Quartz Pebble (Milky and Gray)
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Tumbled Peach/Pink Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Quartzite with Hematite staining
Quartzite (SiO2)
metamorphic
Chert (with Quartz veins)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (White/Milky Pebble)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based typically)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Agate
Agate (Chalcedony), SiO2
Mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz-veined Granite or Gneiss Pebble
Silicate-rich metamorphic rock fragment
metamorphic
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz in Matrix
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Sandstone (likely Arkosic or Lithic)
Clastic Sedimentary Rock (SiO2 with accessory minerals)
sedimentary
Quartz (Smoky or Citrine variety)
Silicon Dioxide (SiO2)
mineral
Chert (with Limestone and Iron Oxide staining)
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Quartz with Mica inclusions (likely Schist or Gneiss host)
Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)
metamorphic
Obsidian
Volcanic Glass (SiO2)
igneous
Quartz (Gray or Smoky variety)
Silicon Dioxide (SiO2)
mineral
Sandstone with Secondary Mineral Encrustation
Arenite with Silica/Calcite deposits (SiO2 or CaCO3)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral