Jasper
Microcrystalline Quartz (SiO2)
sedimentary
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Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Native Copper
Copper (Cu)
mineral
Petrified Wood
Silicified Wood (Permineralized organic tissue)
fossil
Agate
Silicon dioxide (Chalcedony), SiO2
gemstone
Quartz Crystal Rock
Silicon Dioxide (SiO2)
mineral
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Tiger's Eye
Silicon Dioxide (Quartz pseudomorph after crocidolite), $SiO_2$
mineral
Granite
Intrusive Igneous Rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Pegmatite
Igneous Pegmatite (Quartz-Feldspar-Biotite)
igneous
Mica (Muscovite or Biotite)
Sheet silicate mineral group (e.g., KAl2(AlSi3O10)(F,OH)2)
mineral
Sugilite
KNa2(Fe,Mn,Al)2Li3Si12O30
mineral
Quartz Vug / Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Anyolite (Ruby in Zoisite)
Metamorphic rock composed primarily of green Zoisite (Ca2Al3(Si2O7)(SiO4)O(OH)), red Ruby (Al2O3:Cr), and black Tschermakite
metamorphic
Blue Quartz
Silicon Dioxide (SiO2)
mineral
Aragonite
Aragonite (CaCO3)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Basalt or Slag
Extrusive Igneous Rock / Industrial Slag
igneous
Basalt
Extrusive Igneous Rock
igneous
Sandstone (Weathered / Crushed)
Quartz Sandstone
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Green Jasper / Green Quartz
Silicon dioxide (SiO2) with mineral impurities
sedimentary
Belemnite Fossil (Guardsman Fossil)
Belemnitella spp. (Rostrum)
fossil
Pink Quartz / Rose Quartz
Silicon Dioxide (SiO2)
mineral
Green Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Lapis Lazuli and Amazonite
Complex silicate mineral aggregates (Lazurite, Calcite, Pyrite & Microcline feldspar)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Unknown Rock
Unknown
unknown
Amethyst
Quartz (Silicon Dioxide, SiO2)
gemstone
Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Graphite
Graphite (Carbon, C)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Lake Superior Agate
Silicon Dioxide (Chalcedony / Quartz)
gemstone