Red Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Category
Not A Natural Rock
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Red Sandstone
Quartz arenite / Lithic sandstone
sedimentary
Shale
Shale (claystone/mudstone)
sedimentary
Quartz Druzy
Crystalline Silicon Dioxide (SiO2)
mineral
Red Sandstone
Sandstone (Quartz Arenite / Arkose with Hematite cement)
sedimentary
Chalk (or Soapstone Marking Stick)
Calcium Carbonate (CaCO3) / Hydrous Magnesium Silicate (Mg3Si4O10(OH)2)
sedimentary
Likely weathered river pebble
Unidentified rounded lithic pebble; the image does not show enough detail to determine its rock species
sedimentary
Shale
Sedimentary Shale
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Banded Basalt with Sandstone Vein
Basalt with sedimentary intrusion
igneous
Dyed Quartz Pendant
Silicon Dioxide (SiO2) with artificial dye
mineral
Amethyst Geode
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Cut/Faceted Gemstone)
Silicon Dioxide (SiO2)
gemstone
Small rounded pebble (specific rock type indeterminate)
Unidentified lithic pebble; composition cannot be determined from the image
sedimentary
Chert Concretion (Flint)
Silicon Dioxide (SiO2)
sedimentary
Purple glassy pebble, possibly slag glass
Unidentified; likely man-made glass rather than a natural mineral
mineral
Small water-worn pebble, likely quartz-rich
Rock fragment of uncertain composition; possibly quartzite or chert
sedimentary
Shale
Fissile mudstone (Shale)
sedimentary
Porphyritic Basalt (Porphyry pebble)
Porphyritic Basalt / Amygdaloidal Basalt
igneous
Grey River Pebble (Greywacke / Basalt)
Stream-rounded silicate rock pebble
sedimentary
Basalt River Stone
Basalt (extrusive igneous rock)
igneous
Banded Sedimentary Rock
Sedimentary rock with Liesegang banding
sedimentary
Granite Pebble
Granite (Phaneritic Igneous Rock)
igneous
Granite Pebble
Phaneritic Felsic Igneous Rock (Granite)
igneous
Banded Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Rounded gray-green rock, likely gneiss
Gneiss (tentative; mineral composition and texture cannot be confirmed from the image)
metamorphic
Turquoise (rough, likely stabilized or treated)
Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Polymictic conglomerate or breccia (possibly concrete-like aggregate)
Lithified polymictic gravel; clasts may include basalt, granite, quartzite, and other silicates
sedimentary
Mahogany Obsidian
Obsidian (Volcanic Glass) with Hematite or Magnetite inclusions, SiO2 (Silicon Dioxide)
igneous
Wishing Stone
Quartz-veined sedimentary rock
sedimentary
Pink Granite
Intrusive Felsic Igneous Rock
igneous
Polished stone sphere, possibly agate or jasper
Likely microcrystalline quartz (SiO₂); exact variety cannot be confirmed from the image
mineral
Rounded, mottled river pebble
Unidentified fine-grained rock; the image is insufficient for a reliable species-level identification
igneous
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Quartz-rich river pebble
Likely quartz-rich granitic rock; mainly quartz (SiO₂), with possible feldspar and mica
igneous
Rounded brown river pebble
Indeterminate lithic clast; possibly weathered sandstone or fine-grained volcanic rock
sedimentary
Smoky Quartz and Chalcedony Geode Fragment
Silicon Dioxide (SiO2)
mineral
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Blue topaz (possible)
Topaz, Al₂SiO₄(F,OH)₂
mineral