Fossilized Bivalve
Phylum Mollusca, Class Bivalvia
fossil
Category
Organic (Non Rock)
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Weathered quartz-rich metamorphic rock, likely quartzite
Quartzite; predominantly crystalline SiO₂, possibly with mica or feldspar
metamorphic
Fossilized coral (likely honeycomb or branching coral)
Fossil coral; probable Scleractinia or Tabulata, composition mainly microcrystalline CaCO₃
fossil
Snowflake Obsidian
Volcanic glass containing Spherulites of Cristobalite (SiO2)
igneous
Fossiliferous Limestone
Biogenic Sedimentary Rock (CaCO3)
sedimentary
Breccia
Clastic Breccia (SiO2/CaCO3 dominated)
sedimentary
River Cobble (Sandstone)
Arenite (primarily SiO2)
sedimentary
Quartzite Beach Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Snowflake Obsidian
Hydrated Volcanic Glass with Cristobalite inclusions
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Fossilized Bark
Lepidodendron / Sigillaria fossil impression
fossil
Sandstone
Sandstone (principally SiO2/Silicon Dioxide)
sedimentary
Chert (specifically Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Tumbled green aventurine (probable)
Quartzite dominated by quartz (SiO₂), with green fuchsite mica inclusions
mineral
Quartzite Cobble with Iron Staining
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite Pebble
Metamorphic Quartz (SiO2)
metamorphic
Serpentinite
Serpentinite (group of hydrous magnesium iron phyllosilicates)
metamorphic
Mahogany Obsidian
Volcanic Glass with Hematite or Magnetite inclusions (SiO2 + Fe2O3)
igneous
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Likely graphite-rich metamorphic rock (graphitic schist)
Graphitic schist; chiefly carbon (graphite) with quartz, mica, and possibly sulfides
metamorphic
Claystone / Mudstone
Mudstone (Hydrous aluminum silicate rich rock)
sedimentary
Quartzite
Metamorphic Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Obsidian (Polished)
Obsidian (Volcanic glass, primarily SiO2)
igneous
Obsidian
Obsidian (volcanic glass), amorphous SiO2 + impurities
igneous
Precious Opal
Hydrated silica (SiO2·nH2O)
mineraloid
Sandstone with Liesegang Rings
Clastic Sedimentary Rock with Iron Oxide Precipitates (SiO2 + Fe2O3)
sedimentary
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Obsidian
Volcanic Glass (SiO2)
igneous
Opal
Hydrated Silica (SiO2·nH2O)
mineral
Apache Tear
Obsidian (Hydrated Volcanic Glass) - SiO2 (with impurities)
igneous
Chert / Flint
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Opal
Hydrated silica (SiO2 "NH2O)
mineraloid
Shale with Iron Staining
Fissile Mudrock (Sedimentary Rock)
sedimentary
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Obsidian
Volcanic glass (mainly SiO2)
Igneous
Snowflake Obsidian
Volcanic Glass with Spherulite Inclusions (primarily SiO2)
igneous