Petrified Wood rock specimen

Petrified Wood

Silicified Wood (SiO2)

sedimentary

Fulgurite rock specimen

Fulgurite

Fulgurite (Lechatelierite-rich fused silica)

mineraloid

Pink Granite (River Pebble) rock specimen

Pink Granite (River Pebble)

Felsic Intrusive Igneous Rock

igneous

Quartzite rock specimen

Quartzite

Quartzite (primarily SiO2)

metamorphic

Quartz / Quartzite rock specimen

Quartz / Quartzite

Silicon Dioxide (SiO2)

mineral / metamorphic

Granodiorite rock specimen

Granodiorite

Granodiorite

igneous

Mica-rich Schist fragment rock specimen

Mica-rich Schist fragment

Mica Schist

metamorphic

Copper-bearing Mica Schist rock specimen

Copper-bearing Mica Schist

Mica Schist with Native Copper inclusions

metamorphic

Granodiorite rock specimen

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

igneous

Granodiorite rock specimen

Granodiorite

Granodiorite (containing quartz, plagioclase, and biotite/hornblende)

igneous

Granodiorite rock specimen

Granodiorite

Phaneritic Plutonic Granodiorite

igneous

Sandstone rock specimen

Sandstone

Clastic sedimentary rock (primarily SiO2)

sedimentary

Basalt rock specimen

Basalt

Extrusive mafic igneous rock

igneous

Granite rock specimen

Granite

Granite (Phaneritic igneous rock)

igneous

Diorite rock specimen

Diorite

Diorite (Intermediate intrusive igneous rock)

igneous

Gneiss (specifically Micaceous Gneiss) rock specimen

Gneiss (specifically Micaceous Gneiss)

Gneiss (High-grade Regional Metamorphic Rock)

metamorphic

Ruby (Raw/Rough) rock specimen

Ruby (Raw/Rough)

Corundum (Al2O3 with Chromium trace)

mineral

Ruby (Rough/Raw) rock specimen

Ruby (Rough/Raw)

Corundum (Al2O3:Cr)

mineral

Mica Schist rock specimen

Mica Schist

Mica Schist (primarily Muscovite or Biotite KAl2(AlSi3O10)(OH)2)

metamorphic

Milky Quartz rock specimen

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Black Opal rock specimen

Black Opal

Hydrated silica (SiO2·nH2O)

mineraloid

Alexandrite rock specimen

Alexandrite

Chrysoberyl (BeAl2O4 with Chromium traces)

mineral

Rough Star Sapphire (Corundum) rock specimen

Rough Star Sapphire (Corundum)

Al2O3 (Aluminum Oxide)

mineral

Ruby (Pinkish-Red) rock specimen

Ruby (Pinkish-Red)

Corundum (Al2O3 with Chromium trace)

mineral

Obsidian rock specimen

Obsidian

Obsidian (Amorphous volcanic glass, SiO2 rich)

igneous

Opal rock specimen

Opal

Hydrated silica (SiO2·nH2O)

mineraloid

Smoky Quartz rock specimen

Smoky Quartz

Silicon Dioxide (SiO2)

mineral

Precious Opal rock specimen

Precious Opal

Hydrated amorphous silica (SiO2·nH2O)

mineral

Peridot rock specimen

Peridot

Olivine (Mg, Fe)2SiO4

mineral

Garnet rock specimen

Garnet

Garnet Group (often Pyrope or Almandine); X3Y2(SiO4)3

mineral

Peridot rock specimen

Peridot

Olivine ((Mg,Fe)2SiO4)

mineral

Peridot rock specimen

Peridot

Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4

mineral

Peridot rock specimen

Peridot

Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4

mineral

Yellow Beryl (Heliodor) rock specimen

Yellow Beryl (Heliodor)

Beryllium aluminum silicate (Be3Al2Si6O18)

mineral

Clear Quartz Crystal rock specimen

Clear Quartz Crystal

Silicon Dioxide (SiO2)

mineral

Serpentine rock specimen

Serpentine

Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

metamorphic

Tanzanite rock specimen

Tanzanite

Blue Zoisite (Ca2Al3(SiO4)(Si2O7)O(OH))

mineral

Amethyst (Faceted) rock specimen

Amethyst (Faceted)

Silicon Dioxide with Iron impurities (SiO2)

mineral

Peridot rock specimen

Peridot

Olivine (Mg, Fe)2SiO4

mineral

Peridot rock specimen

Peridot

Olivine (Mg, Fe)₂SiO₄

mineral

Nephrite Jade rock specimen

Nephrite Jade

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

metamorphic

Blue Kyanite in Quartz rock specimen

Blue Kyanite in Quartz

Kyanite (Al2SiO5)

mineral