Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Category
Organic (Non Rock)
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Mahogany Obsidian
Volcanic Glass (SiO2 with Fe/Mg oxides)
igneous
Mahogany Obsidian
Obsidian (Volcanic Glass with Hematite inclusions)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Common Opal
Hydrated silica (SiO2 "n"H2O)
mineral
Chert Nodules in Limestone
Cryptocrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Petrified Wood (Silicified Wood)
fossil
Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin
gemstone
Quartzite Beach Pebble
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO₂)
metamorphic
Common Opal (Potch)
Opal (Hydrated silica, SiO2·nH2O)
mineral
Amber
Fossilized tree resin
gemstone
Quartzite Cobble
Meta-quartzite (SiO2)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous
Sapphire
Corundum (Al2O3)
gemstone
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Fossil Shark Tooth
Chondrichthyes (Class)
fossil
Anthracite Coal
Anthracite (Carbon)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (mostly SiO2)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Limonite (Iron Ore)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral理论上属于沉积成因
Black Obsidian
Obsidian (Volcanic Glass)
igneous
Siltstone River Pebble
Siltstone (primarily composed of silt-sized particles)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Cullet Glass (Slag)
Amorphous Silicon Dioxide (Man-made)
Mineraloid
Quartzite
Quartzite (SiO2)
metamorphic
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Soil with Mineral Detritus and Quartz Fragments
Regolith / Silicate Mineral Aggregate
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Black Obsidian
Volcanic Glass (SiO2)
igneous
Tektite (Indochinite)
Tektite (Natural silica glass)
igneous
Sea Glass
Amorphous Silicon Dioxide (Man-made glass weathered by nature)
mineral
Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary