Muscovite Mica Schist
Metamorphic rock rich in muscovite mica (KAl2(AlSi3O10)(F,OH)2)
metamorphic
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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
Dyed Blue Agate Slice
Silicon Dioxide (Chalcedony variety), $SiO_2$
gemstone
Basalt (Vesicular)
Extrusive Igneous Rock
igneous
Megalodon Shark Tooth
Otodus megalodon
fossil
Tektite
Natural impact glass
meteorite
Mammoth Tooth
Mammuthus tooth
fossil
Fossilized Horse Tooth
Equus sp. (Tooth)
fossil
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Mammoth Tooth
Mammuthus tooth fossil
fossil
Quartz with Feldspar and Matrix
Silicon Dioxide (SiO2) with Potassium/Plagioclase Feldspar
mineral
Amethyst Beads
Quartz (Silicon Dioxide, SiO2 with iron impurities)
gemstone
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Amber
Fossilized tree resin (Amorphous organic polymer)
gemstone
Basalt
Mafic extrusive igneous rock
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz with Mica
Silicon Dioxide (Quartz, SiO2) with Muscovite/Biotite Mica
mineral
Jasper Beads
Microcrystalline Quartz (SiO2)
sedimentary
Carnelian (Tumbled Pebble)
Quartz (Variety: Carnelian, SiO2)
gemstone
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Hematite
Hematite (Fe2O3)
mineral
Hematite Beads
Iron Oxide (Fe2O3)
mineral
Rhodonite
(Mn,Fe,Mg,Ca)SiO3
mineral
Rhodochrosite
Rhodochrosite (MnCO3)
mineral
Blue Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
Carnelian
Quartz (Variety: Chalcedony, SiO2)
gemstone
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Amethyst
Quartz (Silicon Dioxide, SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Porphyritic Rhyolite
Extrusive igneous rock with felsic composition
igneous
Chert
Microcrystalline quartz (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Basalt Pebble (Shaped)
Extrusive Igneous Rock
igneous
Jasper Agate
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary
Jadeite
Jadeite (NaAlSi2O6)
mineral
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary