Chert / Flint
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Category
Organic (Non Rock)
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Red Quartzite
Quartzite (primarily SiO2)
metamorphic
Mahogany Obsidian
Volcanic Glass (predominantly SiO2 with Fe2O3 inclusions)
igneous
Quartzite (Engineered Stone)
Silicon Dioxide (SiO2) based synthetic composite
metamorphic
Chert (Jasper/Agate)
Silicon Dioxide (SiO2)
sedimentary
Dark volcanic rock, likely basalt
Basalt; fine-grained mafic igneous rock composed mainly of plagioclase and pyroxene, with possible olivine and iron oxides
igneous
Snowflake Obsidian
Obsidian with Cristobalite inclusions (70–75% SiO2)
igneous
Limestone pebble
Sedimentary rock, primarily calcium carbonate (CaCO3)
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock / CaCO3 with fossil fragments
sedimentary
Quartzite (River Stone)
Quartzite
metamorphic
Weathered limestone or calcareous fossil fragment
Calcite-rich carbonate rock (CaCO₃), possibly fossiliferous limestone
sedimentary
Snowflake Obsidian
Vitreous Volcanic Rock (Amorphous Silicate), SiO2
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Chert (Flint)
Chert (SiO2)
sedimentary
Hag Stone
Perforated Sedimentary Rock (typically Flint or Limestone)
sedimentary
Granite
Phaneritic intrusive igneous rock (Granite)
igneous
Tumbled green aventurine (likely quartzite)
Aventurine quartzite; predominantly microcrystalline quartz (SiO₂) with green fuchsite mica or chlorite
metamorphic
Quartzite with Hematite
Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 inclusions)
metamorphic
Basalt
Basalt
igneous
Banded Sandstone (Liesegang Rings)
Sedimentary sandstone with Iron oxide precipitates
sedimentary
Quartzite Pebble
Quartzite
metamorphic
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Chert (Cryptocrystalline Silicon Dioxide, SiO2)
sedimentary
Chert (Flint Pebbles)
Microcrystalline Quartz (SiO2)
sedimentary
Blue Slag Glass
Man-made Silicon Dioxide (Amorphous)
Anthropogenic (Man-made)
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide, SiO2)
igneous
Iron-rich quartzite or quartz-bearing metamorphic rock
Quartzite, predominantly SiO₂, with iron-oxide staining (hematite/goethite)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone
Arenite (Sedimentary rock comprising sand-sized grains)
sedimentary
N/A (Non-Geological Object)
N/A
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Shark Tooth Fossil
Vertebrate fossilized tooth
fossil
Chert (specifically Flint or Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Jasper / Agate (Chalcedony Group)
Microcrystalline Quartz (SiO2)
sedimentary
N/A - Non-Geological Item
not a rock/mineral
Tumbled brown chalcedony or quartzite pebble
Microcrystalline quartz (SiO₂), likely chalcedony; exact identification requires testing
mineral
Obsidian (Apache Tear)
Amorphous Volcanic Glass (SiO2)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclastic Inclusions
sedimentary
Quartzite pebble
Quartzite (SiO2 dominated)
metamorphic
Concretion
Septarian or Siderite Concretion
sedimentary
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic