Serpentine
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4
metamorphic
Category
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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
Cullet Glass (Industrial Slag Glass)
Amorphous Silica (SiO2) with metallic oxide impurities
Man-made byproduct (often mistaken for Obsidian or Emerald)
Chert with Quartz Veining
Microcrystalline Silica (SiO2)
sedimentary
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
Geode (Quartz / Chalcedony Geode)
SiO2 (Silicon Dioxide)
sedimentary
Granite River Rock
Intrusive igneous rock (composed mainly of quartz, alkali feldspar, and plagioclase)
igneous
Granodiorite
Phaneritic-textured Intrusive Granodiorite
igneous
Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Mineral/Sedimentary Geode
Granite / Quartzite Specimen
Granite / Quartz (SiO2 with Feldspar and Mica)
igneous
Basalt Pebble (Vesicular / Beach Cobble)
Basalt (mafic extrusive igneous rock)
igneous
Jasper
Silicon dioxide (SiO2)
mineral
Chert Pebble
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Yellow Quartzite (River Pebble)
Quartzite (SiO2)
metamorphic
Unidentified Rock Fragment
Unknown
Rock
Amber-bearing Coal/Sedimentary Rock
Bituminous coal or carbonaceous siltstone with Fossilized Tree Resin (C10H16O)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Red Jasper (Beach Pebble)
SiO2 (Microcrystalline Quartz with Hematite inclusions)
sedimentary