Yellow Jasper with Hematite
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Category
Man Made Rock (Technosol)
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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
Basalt
Extrusive Igneous 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
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
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
Rounded beach pebble
Lithology indeterminate; likely fine-grained sandstone, mudstone, or weathered volcanic rock
sedimentary
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
Cullet Glass (Industrial Slag Glass)
Amorphous Silica (SiO2) with metallic oxide impurities
Man-made byproduct (often mistaken for Obsidian or Emerald)
Granite
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Quartz Geode
Quartz (Silicon Dioxide, SiO2)
mineral
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Quartz (Clear/Smoky Geode fragment)
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenite (Iron-rich)
sedimentary
Tumbled serpentine with dark magnetite/chromite matrix
Serpentinite; chiefly antigorite/lizardite, Mg3Si2O5(OH)4, with magnetite and possibly chromite
metamorphic
Basalt
Extrusive igneous rock
igneous
Granite
Granite
igneous
Druzy Quartz on Chert/Chalcedony
Silicon Dioxide (SiO2)
mineral
Fossil Coral
Rugose Coral or Tabulate Coral (Phylum Cnidaria)
fossil
Weathered granite or granitic gneiss
Granite: quartz, feldspar, and mica; possibly gneiss if the dark minerals are banded
igneous
Granite
Granite; primarily quartz (SiO₂), feldspar, and mica
igneous
Quartz-Veined Slate or Greenstone
Metamorphic rock with quartz vein (SiO2)
metamorphic
Quartz with Schist Inclusion
Crystalline Silicon Dioxide (SiO2) with Muscovite/Biotite Schist
metamorphic
Druzy Quartz on Chalcedony Matrix
Silicon Dioxide (SiO2)
mineral