Granite River Cobble
Phaneritic Felsic Igneous Rock
igneous
Category
Sedimentary (Chemical)
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Quartz (Milky or Cloudy variety)
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2 silicon dioxide)
metamorphic
Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Porphyritic Basalt (Chinese Writing Stone)
Porphyritic Basalt or Andesite containing plagioclase feldspar phenocrysts
igneous
Pink Quartzite
Quartzite (primarily SiO2)
metamorphic
Obsidian
Amorphous Volcanic Glass (primarily SiO2)
igneous
Cultured Marble (Synthetic)
Polymer-matrix composite (typically calcium carbonate in polyester resin)
Synthetic / Composite Material
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Quartzite
SiO2 (Silicon Dioxide)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Gold Ore
Native Gold (Au)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Yellow Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Digital Multimeter (Synthetic Object)
Digital Multimeter (DMM)
not a rock
Quartzite (Milky)
Metamorphic rock predominantly composed of Quartz (SiO2)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Fire Agate
SiO2 (Silicon Dioxide with Iron Oxide inclusions)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartz (with probable host rock)
Silicon Dioxide (SiO2)
mineral
Quartzite with Iron Inclusions
Quartzite (primarily SiO2)
metamorphic
Gold
Native Gold (Au)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Native Gold (in Jewelry form)
Gold (Au)
Mineral
Quartzite Pebbles
Meta-quartzite (SiO2)
metamorphic
Vanadinite
Vanadinite (Pb5(VO4)3Cl)
mineral
Gold Nugget
Native Gold (Au)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Yellow Quartzite (River Pebble)
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartz (Milky/Smoky variety)
Silicon Dioxide (SiO2)
mineral
Quartzite pebble
Quartzite (principally SiO2)
metamorphic