Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Category
Non Geological
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Quartzite
Quartzite (primarily SiO2)
metamorphic
Amber (Rough)
Amber (Fossilized Tree Resin, succinite)
mineral
Obsidian
Obsidian (Volcanic Glass)
igneous
Quartzite
Quartzite (mostly SiO2)
metamorphic
Amber
Succinicum (Formula: C10H16O)
Mineraloid
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Amber
Resinite (Succinite if from the Baltic); Chemical Formula: C10H16O (approximate)
Organic Diamond/Gemstone (often associated with Sedimentary sequences)
Quartzite
Quartzite (SiO2)
metamorphic
River Siltstone Pebble
Siltstone (primarily composed of silica and clay minerals)
sedimentary
Quartzite (River Stone)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Apache Tear
Obsidian (Hydrated Volcanic Glass) - SiO2 (with impurities)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian
Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)
igneous
Quartzite Beach Pebble
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO₂)
metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Quartzite
Quartzite (mostly SiO2)
metamorphic
Quartzite (River Siltstone variety)
Quartzite (SiO2)
metamorphic
Quartzite with Iron Inclusions
Quartzite (primarily SiO2 with Fe2O3 impurities)
metamorphic
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Pink Opal (Common Opal)
Amorphous Hydrated Silica (SiO2·nH2O)
mineral
Quartzite
Quartzite
metamorphic
Quartzite
Quartzite (consisting primarily of SiO2)
metamorphic
Slag Glass
SiO2 (Silicon Dioxide) with impurities
man-made glass
Slate
Slate (Metamorphic Rock)
metamorphic
Hematite
Iron Oxide (Fe2O3)
mineral
Garnet-bearing granite or pegmatitic granitic rock
Coarse-grained granitoid, likely granite or pegmatite, composed mainly of quartz and feldspar with almandine/spessartine garnet and dark biotite or amphibole
igneous
Carnelian
Carnelian (Silicon Dioxide, SiO2)
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni)3Si2O5(OH)4
metamorphic
Pink Quartzite Pebble
Quartzite (SiO2)
metamorphic
Turritella Agate / Fossiliferous Limestone
Elimia tenera in Chalcedony/Calcite Matrix
fossil
Coal
Anthracite / Bituminous Coal
sedimentary
Black Obsidian
Volcanic Glass (Amorphous SiO2 with trace impurities)
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartz Arenite
metamorphic
Chert (Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Hematite / Ironstone
Iron Oxide (Fe2O3)
sedimentary
Quartzite
Metamorphic Rock (Quartzite), primarily SiO2
metamorphic