River Stone (Sedimentary Sandstone/Quartzite)
Arenite/Quartzite transition specimen
sedimentary
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Banded Sandstone Peabble
Arenite with iron oxide banding
sedimentary
Sandstone with Quarzite clasts
Arenite (SiO2 based)
sedimentary
Wishing Rock (Quartz Vein in Host Rock)
Silicon dioxide (SiO2) vein in various host rocks
Igneous/Sedimentary/Metamorphic with Mineral Vein
Weathered granite or granitic gneiss
Granite; predominantly quartz, feldspar, and mica (exact identification is uncertain from the image)
igneous
Pumice
Pumice (volcanic rock)
Igneous
Veined Limestone (Micrite) with Quartz/Calcite Veins
Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions
sedimentary
Granite with Cupules / Bedrock Mortars
Granite (felsic intrusive plutonic rock)
igneous
Banded Gneiss
Gneiss (high-grade metamorphic silicate rock)
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Schist
Schist (Metamorphic Rock)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Calcite (or Travertine / Limestone)
Calcium Carbonate (CaCO3)
sedimentary
Ulexite
NaCaB5O6(OH)6·5H2O
mineral
Orange Quartz (or Carnelian Chalcedony)
Silicon Dioxide (SiO2)
mineral
Ironstone / iron-oxide-rich rock fragment
Likely limonite/goethite-rich ironstone; exact identification is not possible from the image alone
sedimentary
Granite
Granite, a coarse-grained intrusive felsic rock composed mainly of quartz, feldspar, and mica
igneous
Weathered quartz-bearing rock
Quartz-rich vein material; likely quartz with iron oxides and feldspar, exact rock type uncertain
mineral
Hag Stone
Perforated sedimentary rock (typically sandstone or limestone)
sedimentary
Small rough mineral/rock fragment
Indeterminate; possibly quartz-bearing rock or weathered feldspar
mineral
Blue-green rough mineral specimen (identity uncertain)
Undetermined; the image is insufficient for a reliable mineral identification
mineral
Geode (Unopened)
Siliceous Geode (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Asphalt aggregate
Human-made bituminous asphalt containing crushed silicate rock aggregate
sedimentary
Small rounded pebble, possibly quartz-rich stone
Indeterminate; likely quartz/quartzite or a weathered feldspathic pebble
igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Banded Sandstone (Beach Pebble)
Quartz Arenite Sandstone
sedimentary
Quartz geode
Quartz (SiO₂), likely in a chalcedony or other silica-rich host rind
mineral
Quartz (Smoky/Granular variety)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone with Quartz Vein
Arenite with SiO2 intrusion
sedimentary
Quartz geode
Microcrystalline and crystalline quartz, SiO₂, likely with chalcedony and iron-oxide staining
mineral
Peach Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Sedimentary or Igneous
Orbicular Jasper (Ocean Jasper)
Silicon Dioxide (SiO2) with various inclusions
mineral
Granite (likely weathered granitic rock)
Granite; chiefly quartz (SiO₂), feldspar, and mica
igneous
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic
Unable to identify - Image contains non-geological items
N/A
Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous