Chert with Quartz Veins
Microcrystalline Quartz (SiO2)
sedimentary
Category
Organic (Non Rock)
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Chert (Brecciated Chert)
Silicon Dioxide (SiO2)
sedimentary
Fossil Shell
Brachiopod or Mollusk fossil
fossil
Sandstone (Ferruginous)
Clastic Sedimentary Rock (Sandstone)
sedimentary
Obsidian
Obsidian (volcanic glass)
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Quartzite
Quartzite
metamorphic
Quartzite
Quartzite
Metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Limestone
Sedimentary carbonate rock (CaCO3)
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Abbey Bominable (Monster High character)
Anthropomorphic Yeti / Digital Animation
not a rock (animated character)
Apache Tear
Obsidian (Volcanic Glass)
igneous
Snowflake Obsidian
Volcanic Glass with Spherulite inclusions (Amorphous SiO2 + Cristobalite)
igneous
Coal
Bituminous coal (Complex organic sedimentary rock)
sedimentary
Quartzite Cobble
Quartzite (SiO2 based metamorphic rock)
metamorphic
Quartzite with Epidote
Meta-quartzite containing Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
metamorphic
Metaconglomerate
Protolith: Conglomerate (comprising SiO2, Al2O3, etc.)
metamorphic
Black Obsidian
Obsidian (Volcanic Glass)
igneous
Quartzite
Metamorphic quartz rock (SiO2)
metamorphic
Heart-shaped Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Weathered feldspar-rich rock, possibly amazonite-bearing granite
Likely granite or pegmatite containing microcline feldspar (KAlSi₃O₈), with quartz and altered minerals
igneous
Coal
Carbonaceous sedimentary rock (C)
sedimentary
Basalt (River Rock)
Basalt (Mafic volcanic rock)
igneous
Red Sandstone
Sandstone (Quartz Arenite / Arkose with Hematite cement)
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
mineral
Quartzite River Rock
Metamorphic Quartzite (primarily SiO2)
metamorphic
Obsidian
Volcanic Glass (SiO2)
igneous
Fossil Coral (Petoskey / Horn Coral Sliced Button)
Scleractinia / Rugosa (Silurian-Devonian Anthozoa)
fossil
Shale or Mudstone
Argillaceous sedimentary rock
sedimentary
Chert (Yellow/Tan Variety)
Chert (SiO2)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Earth
Terra / Earth
igneous, sedimentary, and metamorphic
Siltstone
Siltstone (primarily composed of quartz and clay minerals)
sedimentary
Jasper (Iron-stained Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Quartzite River Rock
Metamorphic Quartzite (SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Quartzite Cobble
Metamorphosed Sandstone (SiO2)
metamorphic