Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary (Chemical)
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Quartzite
Quartzite (SiO2)
metamorphic
Milky Quartz (Water-worn Pebble)
Silicon Dioxide (SiO2)
mineral
Tiger's Eye (Rough)
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
metamorphic
Gold Ore (Lode Gold)
Native Gold (Au) in Matrix
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite pebble
Quartzite (primarily SiO2)
metamorphic
Quartzite (Yellow/Tan Quartz Cobble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Blue Quartz (potentially Dumortierite-included)
Silicon Dioxide (SiO2) with inclusions
mineral
White Sapphire
Corundum (Al2O3)
mineral
Gold
Gold (Native Au)
mineral
Slag Glass
Glassy Silicate Residue
industrial byproduct
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Blue Agate
Chalcedony (SiO2)
mineral
Beryl (var. Aquamarine/Blue Beryl) in Quartz Matrix
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral
Quartz (Raw and Water-worn)
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic Glass (70% or more SiO2)
igneous
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, or Chrysotile)
metamorphic
Quartzite (River Pebble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Gold
Native Gold (Au)
mineral
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Granodiorite
Phaneritic intrusive igneous rock (intermediate composition)
igneous
Muscovite Mica (in Quartz matrix)
Potassium aluminum silicate hydroxide fluoride (KAl2(AlSi3O10)(F,OH)2)
mineral
Quartzite Pebble (River Rock)
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Gold
Native Gold (Au)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Gold Flakes (Placer Gold)
Gold (Au)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Obsidian
Obsidian (Volcanic Glass)
igneous
Diabase (Greenstone)
Diabase (also known as Dolerite)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Quartz (Quartzite or Quartz Pebble)
Silicon Dioxide (SiO2)
metamorphic
Gold
Native Gold (Au)
mineral
Granodiorite
Phaneritic Plutonic Rock (Intermediate)
igneous
Quartz (Common Grains)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Diabase (Greenstone)
Diabase or Dolerite
igneous
Quartzite
Quartzite (SiO2)
metamorphic