Chert Concretion with Iron Oxide Staining
Microcrystalline Quartz (SiO2)
sedimentary
Category
Organic (Non Rock)
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Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous
Fulgurite
Fulgurite (Lechatelierite/Silica glass)
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Chert (Flint / Quartz Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Concretion / Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Obsidian
Amorphous volcanic glass (primarily SiO2)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Polished septarian nodule
Septarian concretion, commonly calcite/aragonite with brown calcite or barite veins in a limestone–clay matrix
sedimentary
Granite
Felsic Plutonic Rock (primarily SiO2)
igneous
Snowflake Obsidian
Volcanic glass with Spherulite inclusions (SiO2)
igneous
Graphite-rich metamorphic rock (graphitic schist)
Graphitic schist; chiefly graphite (C), quartz (SiO₂), and mica minerals
metamorphic
Quartzite (River Pebble)
Meta-quartzite (composed primarily of SiO2)
metamorphic
Apache Tear
Obsidian (Hydrated Silica Glass)
igneous
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Banded Rhyolite (Wonderstone)
Rhyolite (High-silica volcanic rock)
igneous
Porphyritic volcanic rock, likely andesite
Porphyritic andesite; mainly plagioclase feldspar and volcanic groundmass, with possible hornblende or pyroxene
igneous
Granodiorite (foreground) and Rose Quartz (background)
Granodiorite / Quartz (SiO2)
igneous
Hag Stone
Perforated Calcarenite or Chert
sedimentary
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Limestone with Calcite Veining
Sedimentary Rock (Calcium Carbonate, CaCO3)
sedimentary
Black Limestone with Calcite Veins
Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert (Brecciated Chert)
Silicon Dioxide (SiO2)
sedimentary
Limestone with Iron Oxide Staining
Sedimentary Rock (Calcite, CaCO3)
sedimentary
Fossiliferous Sedimentary Rock
Sedimentary Rock with Invertebrate Fossil Imprint
fossil
Common Opal with Host Rock
Opal (Hydrated silica, SiO2·nH2O)
mineral
Concrete or asphalt-like aggregate surface with a dark fragment
Uncertain; likely artificial concrete containing mixed lithic aggregate, not a natural rock
sedimentary
Fossilized tooth, likely a mammalian tooth fragment
Indeterminate fossil tooth; possibly an ungulate or carnivoran tooth
fossil
Fossiliferous Sandstone
Sedimentary rock containing invertebrate fossils
fossil
Quartzite with Epidote
Meta-quartzite containing Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
metamorphic
River Rock (Quartzite)
Quartzite
metamorphic
Banded Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Rounded dark pebble, possibly weathered basalt
Fine-grained mafic volcanic rock; likely basalt, but identification is uncertain from the photograph
igneous
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Flint Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (mostly SiO2)
metamorphic
Limestone or Sandstone Cobble
Sedimentary rock (Calcium carbonate or Quartz based)
sedimentary