Amethyst (Rough Quartz) rock specimen

Amethyst (Rough Quartz)

Silicon Dioxide (SiO2) with iron impurities

mineral

Quartzite rock specimen

Quartzite

Quartzite (SiO2)

metamorphic

Granite Glacial Erratic rock specimen

Granite Glacial Erratic

Granite (Phaneritic Quartz-Feldspar Plutonic Rock)

igneous

Sulfur (on Matrix) rock specimen

Sulfur (on Matrix)

Native Sulfur (S8)

mineral

Quartz Druzy on Matrix (with Copper Mineralization) rock specimen

Quartz Druzy on Matrix (with Copper Mineralization)

Silicon Dioxide (SiO2) with Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O)

mineral

Granite rock specimen

Granite

Granite (Felsic Plutonic Rock)

igneous

Shale rock specimen

Shale

Fissile Mudstone

sedimentary

Granodiorite rock specimen

Granodiorite

Phaneritic Granodiorite

igneous

Amazonite rock specimen

Amazonite

Potassium Feldspar (Microcline), K(AlSi3O8)

mineral

Quartzite rock specimen

Quartzite

Quartzite (SiO2)

metamorphic

White Calcite rock specimen

White Calcite

Calcium Carbonate (CaCO3)

mineral

Green Fluorite rock specimen

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

mineral

Specular Hematite and Magnetite Ore rock specimen

Specular Hematite and Magnetite Ore

Iron Oxide (Fe2O3 and Fe3O4)

mineral

Basalt with Scoria and potential Olivine/Pyroxene inclusions rock specimen

Basalt with Scoria and potential Olivine/Pyroxene inclusions

Vesicular Basalt

igneous

Specular Hematite with Pyrite rock specimen

Specular Hematite with Pyrite

Iron Oxide (Fe2O3) with Iron Sulfide (FeS2)

mineral

Slag rock specimen

Slag

Anthropogenic glassy silicate

Mineral-like byproduct

Asphalt (Bituminous Slate/Sandstone) rock specimen

Asphalt (Bituminous Slate/Sandstone)

Asphaltum / Bituminous Rock

sedimentary

Ferrous Slag (Iron Smelting By-product) rock specimen

Ferrous Slag (Iron Smelting By-product)

Fused Siliceous Slag

Anthropogenic Material (Man-made Rock)

Sandstone rock specimen

Sandstone

Clastic Sedimentary Rock (composed mostly of SiO2)

sedimentary

Sandstone (likely Arkose or Quartz Sandstone) rock specimen

Sandstone (likely Arkose or Quartz Sandstone)

Arenite (SiO2 principal component)

sedimentary

Tiger's Eye (Rough) rock specimen

Tiger's Eye (Rough)

Macrocrystalline Quartz (SiO2 with inclusions of Crocidolite)

mineral

Petrified Wood rock specimen

Petrified Wood

Silicified Wood (SiO2 permineralization)

sedimentary

Tiger's Eye rock specimen

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

metamorphic

Purple Agate (Dyed Chalcedony) rock specimen

Purple Agate (Dyed Chalcedony)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

mineral

Tree Agate rock specimen

Tree Agate

SiO2

mineral

Scoria (Lava Rock) rock specimen

Scoria (Lava Rock)

Scoria (extrusive volcanic rock)

igneous

Zebra Jasper (usually a trade name for Serpentine or Basalt blend) rock specimen

Zebra Jasper (usually a trade name for Serpentine or Basalt blend)

Antigorite/Chrysotile (Serpentine family) - Mg3Si2O5(OH)4

metamorphic

Kambaba Jasper rock specimen

Kambaba Jasper

Stromatolite (Fossilized Algae within Microcrystalline Quartz)

sedimentary

Corundum (Sapphire in Host Rock) rock specimen

Corundum (Sapphire in Host Rock)

Corundum (Aluminum Oxide, Al2O3)

mineral

Red Jasper rock specimen

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

sedimentary

Quartzite rock specimen

Quartzite

Quartzite (SiO2)

metamorphic

Milky Quartz rock specimen

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Clear Quartz (Rock Crystal) rock specimen

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

mineral

Red Jasper rock specimen

Red Jasper

Silicon dioxide with hematite impurities (SiO2 + Fe2O3)

mineral

Quartz (Iron-stained) rock specimen

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

mineral

Nephrite Jade rock specimen

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

metamorphic

Quartzite rock specimen

Quartzite

Quartzite (primarily SiO2)

metamorphic

Blue Chalcedony rock specimen

Blue Chalcedony

Silicon Dioxide (SiO2)

mineral

Rose Quartz rock specimen

Rose Quartz

Silicon dioxide (SiO2)

mineral

Blue Agate (Dyed Chalcedony) rock specimen

Blue Agate (Dyed Chalcedony)

Silicon Dioxide (SiO2)

mineral

Blue Lace Agate rock specimen

Blue Lace Agate

Silicon Dioxide (SiO2) - Variety of Chalcedony

mineral

Blue Agate (likely Dyed) rock specimen

Blue Agate (likely Dyed)

Silicon Dioxide (SiO2) - Chalcedony variety

mineral