Vesicular Basalt
Extrusive mafic igneous rock
igneous
Category
Man Made (Synthetic Rock)
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Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Granite-like igneous rock
Likely medium-grained granite or granodiorite; quartz–feldspar–mica aggregate
igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartz-rich gravel fragment
Quartz (silicon dioxide, SiO₂), possibly with feldspar or carbonate inclusions
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Rock Specimen
Unclassified rock specimen
sedimentary
Quartz pebble with calcite
Silicon dioxide (SiO2) with Calcium carbonate (CaCO3)
sedimentary
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble with Feldspar Vein
Quartzite (SiO2) with Feldspar (KAlSi3O8)
metamorphic
Beach Pebble (Basalt/Porphyry)
Weathered Basalt or Porphyry
igneous
Schist (likely Mica Schist)
Mica Schist
metamorphic
Yellow Jasper with Hematite
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Serpentine
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Vesicular Basalt (or Scoria)
Extrusive Igneous Rock (Mafic)
igneous
Basalt Pebble / River Stone
Basalt (Mafic Extrusive Igneous Rock)
igneous
Sandstone with Iron Banding
Arenite with Hematite or Limonite staining (SiO2 with Fe2O3)
sedimentary
Pink Granite
Phaneritic Quartz-Feldspar Plutonic Rock
igneous
Wishing Rock (Quartz Vein in Host Rock)
Silicon dioxide (SiO2) vein in various host rocks
Igneous/Sedimentary/Metamorphic with Mineral Vein
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Basalt
Extrusive Igneous Rock
igneous
Unknown Rock Fragment
Unknown
unknown
Fossilized Shell Impression / Siltstone Fossil
Bivalvia / Brachiopoda mold in Siltstone
fossil
Basalt Pebble
Extrusive Igneous Rock / Basalt
igneous
Basalt
Extrusive Igneous Rock
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Serpentine
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4
metamorphic
Rounded beach pebble
Lithology indeterminate; likely fine-grained sandstone, mudstone, or weathered volcanic rock
sedimentary
Fossil Snail
Gastropoda fossil
fossil
Desert Rose (Baryte or Selenite variant)
Barium Sulfate (BaSO4) or Gypsum (CaSO4·2H2O) with Sand inclusions
mineral
Quartz-veined Metamorphic Pebble
Silicate-rich metamorphic rock with quartz veins (SiO2)
metamorphic
Basalt with Quartz/Calcite Veins
Basalt with hydrothermal vein infill
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt with Granite Inclusions (Xenoliths)
Mafic igneous rock (Basalt) with Sialic minerals
igneous
Quartz Veined Basalt
Mafic Volcanic Rock with Microcrystalline Quartz (SiO2)
igneous
Chert with Quartz Veining
Microcrystalline Silica (SiO2)
sedimentary
Granite
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Quartz Geode
Quartz (Silicon Dioxide, SiO2)
mineral
Cullet Glass (Industrial Slag Glass)
Amorphous Silica (SiO2) with metallic oxide impurities
Man-made byproduct (often mistaken for Obsidian or Emerald)
Red Sandstone
Arenite (Iron-rich)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous