Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
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Basalt
Extrusive igneous rock
igneous
Amygdaloidal Basalt
Extrusive mafic igneous rock with amygdules
igneous
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Obsidian
Volcanic Glass
igneous
Agate with Fossil/Inclusion
Silicon Dioxide (SiO2) with chalcedony and potential fossil inclusion
sedimentary
Fossiliferous Limestone with Crinoid Stem
Sedimentary Rock with Echinodermata fossil fragment
fossil
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Basalt
Extrusive Igneous Rock
igneous
Lava Rock
Basalt / Scoria
igneous
Coal
Bituminous Coal / Anthracite
sedimentary
Tourmalinated Quartz or Schorl
Silicate mineral, specifically Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4) or dark Tourmaline crystal cluster
mineral
Basalt
Extrusive Igneous Rock
igneous
Obsidian
Volcanic Glass
igneous
Basalt
Extrusive Igneous Rock (Mafic)
igneous
Tektite
Natural impact glass
meteorite
Tektite
Natural impact glass
meteorite
Jasper
Silicon dioxide (SiO2) with impurities, microcrystalline quartz
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Mammoth Molar Fossil
Mammuthus primigenius (Tooth fragment)
fossil
Fossilized Bryozoan
Phylum Bryozoa
fossil
Mammoth Tooth
Mammuthus primigenius (Tooth fragment)
fossil
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Mammoth or Mastodon Tooth Fragment
Mammuthus / Mammut molar fragment
fossil
Ammonite Fossil
Ammonoidea
fossil
Fossiliferous Limestone
Fossiliferous Carbonate Rock (CaCO3)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Granite / Pegmatite Pebble
Felsic intrusive igneous rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Fossilized Brachiopod in Limestone
Phylum Brachiopoda embedded in sedimentary limestone
fossil
Pumice or Vesicular Basalt
Vesicular volcanic rock
igneous
Fossil Coral
Rugose Coral / Hexagonaria (CaCO3)
fossil
Pyrite in Quartz
Iron Sulfide (FeS2) embedded in Silicon Dioxide (SiO2)
mineral
Pyrite with Galena and Sphalerite on Matrix
Iron Sulfide (FeS2), Lead Sulfide (PbS), Zinc Sulfide (ZnS)
mineral
Chrysotile Asbestos
Mg3Si2O5(OH)4
mineral
Muscovite Mica Schist
Metamorphic rock rich in muscovite mica (KAl2(AlSi3O10)(F,OH)2)
metamorphic
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Chrysocolla in Matrix
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Lepidodendron Fossil (Scale Tree)
Lepidodendron
fossil
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Quartz-veined Limestone
Sedimentary limestone with hydrothermal quartz/calcite veins (CaCO3 / SiO2)
sedimentary