Quartzite River Rock
Quartzite (SiO2)
metamorphic
Category
Organic (Non Rock)
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Apache Tear
Obsidian (Hydrated Silica Glass)
igneous
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Snowflake Obsidian
Volcanic glass with Spherulite inclusions (SiO2)
igneous
Pebble / Sandstone / Siltstone
Sedimentary Rock (Quartz Sandstone / Siltstone)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Banded Rhyolite (Wonderstone)
Rhyolite (High-silica volcanic rock)
igneous
Fossiliferous Shale
Laminated Mudrock with plant fossils
sedimentary
Chert (Brecciated Chert)
Silicon Dioxide (SiO2)
sedimentary
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Chert Concretion
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Abbey Bominable (Monster High character)
Anthropomorphic Yeti / Digital Animation
not a rock (animated character)
Chert with Fossil Brachiopod
Microcrystalline Quartz (SiO2) with Calcitic Brachiopod inclusion
sedimentary
Chert (Flint)
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Chert Arrowhead (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Green aventurine (likely)
Quartzite dominated by quartz (SiO₂), colored green by fuchsite mica or chlorite
mineral
Hag Stone
Perforated Calcarenite or Chert
sedimentary
Gneiss
Gneiss (foliated metamorphic rock)
metamorphic
Quartzite
Metamorphic Quartz-rich Rock
metamorphic
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
mineral
Basalt
Mafic Igneous Rock (Basalt)
igneous
Fossilized Shell in Limestone
Bivalve fossil (CaCO3) in Carbonate Sedimentary Rock
sedimentary
Dendritic Opal (Common Opal)
Amorphous Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions
mineral
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Quartzite (River Pebble)
Meta-quartzite (composed primarily of SiO2)
metamorphic
Snowflake Obsidian
Volcanic Glass with Spherulite inclusions (Amorphous SiO2 + Cristobalite)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Quartzite
Quartzite
metamorphic
Quartzite
Quartzite
Metamorphic
Apache Tear
Obsidian (Volcanic Glass)
igneous
Quartzite Pebbles
Quartzite (SiO2)
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Sandstone or Mudstone
Sedimentary Rock
sedimentary
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Ironstone Concretion (Moqui Marble / Boji Stone)
Sedimentary Iron Oxide Concretion (Fe2O3 / FeO(OH))
sedimentary
Granite Cobble
Granite (Porphyritic/Coarse-grained)
igneous
Black Obsidian
Obsidian (Volcanic Glass)
igneous
Quartzite
Quartzite (mostly SiO2)
metamorphic