Red Tiger's Eye rock specimen

Red Tiger's Eye

Silicified Crocidolite (Quartz pseudo-morph after Crocidolite), SiO2

metamorphic

Chert with Asphaltum (or Tar) rock specimen

Chert with Asphaltum (or Tar)

Silica (SiO2) with natural Bitumen/Asphaltum

sedimentary

Banded Agate (Gray/Blue Agate) rock specimen

Banded Agate (Gray/Blue Agate)

Agate (Silicon Dioxide, SiO2)

mineral

Anyolite (Ruby in Zoisite) rock specimen

Anyolite (Ruby in Zoisite)

Zoisite with inclusions of Hornblende and Ruby (Ca2Al3(SiO4)3(OH))

metamorphic

Tanzanite (Rough) rock specimen

Tanzanite (Rough)

Blue Zoisite (Ca2Al3(SiO4)3(OH))

mineral

Turquoise rock specimen

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

mineral

Amethyst rock specimen

Amethyst

Silicon Dioxide (SiO2) with trivalent iron (Fe3+) impurities

mineral

Fluorite rock specimen

Fluorite

Calcium Fluoride (CaF2)

mineral

Amethyst (Rose-tinted variation) rock specimen

Amethyst (Rose-tinted variation)

Silicon Dioxide (SiO2) with trace iron impurities

mineral

Peacock Ore (Chalcopyrite) rock specimen

Peacock Ore (Chalcopyrite)

Chalcopyrite (CuFeS2)

mineral

Pyrite rock specimen

Pyrite

Iron Disulfide (FeS2)

mineral

Smoky Quartz rock specimen

Smoky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Diorite rock specimen

Diorite

Diorite (plutonic igneous rock)

igneous

Quartzite rock specimen

Quartzite

Quartzite (SiO2 principal component)

metamorphic

Sandstone rock specimen

Sandstone

Arenite (Sedimentary rock composed of sand-sized minerals or rock grains)

sedimentary

Gold rock specimen

Gold

Native Gold (Au)

mineral

Gold Nugget rock specimen

Gold Nugget

Native Gold (Au)

mineral

Quartz (Milky or White Quartz) rock specimen

Quartz (Milky or White Quartz)

Silicon Dioxide (SiO2)

mineral

Rose Quartz rock specimen

Rose Quartz

Silicon Dioxide (SiO2)

mineral

Gold Nugget rock specimen

Gold Nugget

Native Gold (Au)

mineral

Gold and Diamond rock specimen

Gold and Diamond

Native Gold (Au) and Diamond (C)

mineral

Fluorite (Rainbow or Multi-colored Fluorite) rock specimen

Fluorite (Rainbow or Multi-colored Fluorite)

Fluorite (Calcium Fluoride - CaF2)

mineral

Amethyst rock specimen

Amethyst

Silicon Dioxide (SiO2) with iron impurities

mineral

Sodalite rock specimen

Sodalite

Na8(Al6Si6O24)Cl2

mineral

Pyrite (Fool's Gold) rock specimen

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

mineral

Snowflake Obsidian rock specimen

Snowflake Obsidian

Spherulitic Obsidian (SiO2 + impurities)

igneous

Milky Quartz rock specimen

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Garden Quartz (Lodolite) rock specimen

Garden Quartz (Lodolite)

Quartz with inclusions (SiO2 + various inclusions such as Chlorite, Hematite, or Feldspar)

mineral

Gold Nugget rock specimen

Gold Nugget

Native Gold (Au)

mineral

Rose Quartz rock specimen

Rose Quartz

Silicon Dioxide (SiO2)

mineral

Fluorite rock specimen

Fluorite

Calcium Fluoride (CaF2)

mineral

Sodalite rock specimen

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

mineral

Sodalite rock specimen

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

mineral

Black Tourmaline in Quartz rock specimen

Black Tourmaline in Quartz

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) in Silicon Dioxide (SiO2)

igneous

Gneiss with Quartz Vein rock specimen

Gneiss with Quartz Vein

Gneiss containing Quartz (SiO2) filler

metamorphic

Granite Gneiss rock specimen

Granite Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

metamorphic

Snowflake Obsidian rock specimen

Snowflake Obsidian

Volcanic Glass with Spherulite Inclusions (70-75% SiO2)

igneous

Ferruginous Quartz (Iron-stained Quartz) rock specimen

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

mineral

Mica Schist rock specimen

Mica Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

metamorphic

Eclogite garnet in matrix rock specimen

Eclogite garnet in matrix

Eclogite (Garnet-Omphacite rock)

metamorphic

Granodiorite rock specimen

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

igneous

Geode (Unopened) rock specimen

Geode (Unopened)

Siliceous Geode (SiO2)

sedimentary