Conglomerate
Conglomerate (Sedimentary Clastic Rock)
sedimentary
Category
Not A Natural Rock
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Granite
Phaneritic plutonic rock (Felsic)
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
River Pebble (Granite/Gneiss)
Granitic Pebble (Quartz, Feldspar, Mica composition)
igneous
Ventifact
Wind-abraded rock (Ventifact)
sedimentary
Basalt
Basalt
igneous
Sandstone
Arenite
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite
sedimentary
River Pebble (likely Quartzite or Chert)
Silicon Dioxide (SiO2)
metamorphic or sedimentary
Sandstone (Grooved/Weathered)
Arenite (composed primarily of Quartz and Lithic fragments)
sedimentary
Aura Quartz (Anomalously Coated Quartz)
Silicon Dioxide (SiO2) treated with vaporized metals
mineral
Shale
Argillaceous Sedimentary Rock
sedimentary
Shale (sub-type: Carbonaceous Shale)
Lutaceous Sedimentary Rock
sedimentary
Granite
Plutonic Granite
igneous
Sandstone (with Iron concretions/staining)
Arenite (composed primarily of Quartz and Feldspar with Iron Oxide cement)
sedimentary
Dalmatian Jasper (Dyed Blue)
Peralkaline Rock with Arfvedsonite and Blue Dye
igneous
Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
mineral
Granite
Phaneritic intrusive igneous rock
igneous
Granite
Phaneritic Igneous Rock (Granite)
igneous
Granite
Phaneritic intrusive igneous rock
igneous
Amethyst (Tumbled)
Amethyst (Silicon Dioxide, SiO2 + Fe4+)
mineral
Sandstone (Quartz-rich)
Arenite (SiO2 based)
sedimentary
Moss agate bracelet
Chalcedony (microcrystalline quartz, SiO₂) with chlorite/amphibole inclusions
gemstone
Sandstone (Weathered Pebble)
Arenite (primarily SiO2)
sedimentary
Bivalve Fossil (Shell-bearing Sedimentary Rock)
Class Bivalvia (Phylum Mollusca) within a Calcarenite/Sandstone matrix
fossil
Tumbled brecciated jasper
Silica-rich microcrystalline quartz/chalcedony (SiO₂), with iron-oxide and other mineral inclusions
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Rounded gray-brown river pebble
Indeterminate lithic clast; likely weathered sandstone or fine-grained metamorphic rock
sedimentary
River Cobble (Quartzite / Granitic Gneiss)
Metamorphic Quartzite / Granitic Gneiss
metamorphic
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Pink Granite
Phaneritic intrusive igneous rock (Granite)
igneous
Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Pink Granite River Rock
Phaneritic Felsic Igneous Rock (Granite)
igneous
Chert / Chalcedony Pebble
Cryptocrystalline Quartz (SiO2)
sedimentary
Pink Granite
Phaneritic intrusive igneous rock (Felsic)
igneous
Diamond Druzy (Crystalline Diamond)
Carbon (C)
mineral
Porphyritic Basalt
Porphyritic Basalt (containing Plagioclase or Alkali Feldspar phenocrysts)
igneous
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Shale
Fissile mudrock (composed of clay-sized particles and detrital grains)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral