Rock Identifier

Milky Quartz rock specimen

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Bauxite rock specimen

Bauxite

Hydrated Aluminum Oxides (primarily Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))

sedimentary

Muscovite Mica (with Schist) rock specimen

Muscovite Mica (with Schist)

Muscovite - KAl2(AlSi3O10)(OH)2

metamorphic

Celestite (Celestine) rock specimen

Celestite (Celestine)

Strontium sulfate (SrSO4)

mineral

Celestite rock specimen

Celestite

Celestine (Strontium Sulfate, SrSO4)

mineral

Almandine Garnet in Schist rock specimen

Almandine Garnet in Schist

Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist

metamorphic

Basalt rock specimen

Basalt

Africite (Mafic Igneous Rock)

igneous

Quartz Druzy on Basalt rock specimen

Quartz Druzy on Basalt

Silicon Dioxide (SiO2) on Mafic Volcanic Rock

Mineral on Igneous Rock

Limestone rock specimen

Limestone

Calcium Carbonate (CaCO3)

sedimentary

Milky Quartz rock specimen

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Granite River Rock rock specimen

Granite River Rock

Phaneritic Felsic Igneous Rock (Granite)

igneous

Sandstone (Ferruginous) rock specimen

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 cement)

sedimentary

Almandine Garnet in Matrix rock specimen

Almandine Garnet in Matrix

Almandine, Fe3Al2(SiO4)3

metamorphic

Jasper rock specimen

Jasper

Silicon dioxide (SiO2)

sedimentary

Flint (within Limestone matrix) rock specimen

Flint (within Limestone matrix)

Silicon dioxide (SiO2)

sedimentary

Quartz Pebble rock specimen

Quartz Pebble

Silicon Dioxide (SiO2)

mineral

Tiger's Eye (likely Hawk's Eye variant) rock specimen

Tiger's Eye (likely Hawk's Eye variant)

Pseudomorph of Quartz after Crocidolite (SiO2)

metamorphic

Tiger's Eye (Tumbled Blue/Black-Golden variety) rock specimen

Tiger's Eye (Tumbled Blue/Black-Golden variety)

Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)

metamorphic

Tiger Iron rock specimen

Tiger Iron

Tiger Iron (Hematite, Red Jasper, and Chert/Tiger's Eye composite)

metamorphic

Rose Quartz rock specimen

Rose Quartz

SiO2 (Silicon Dioxide)

mineral

Amethyst (Chevron Amethyst/Dream Amethyst) rock specimen

Amethyst (Chevron Amethyst/Dream Amethyst)

Silicon Dioxide (SiO2) with trace Iron impurities

mineral

River Rock (Greywacke/Siltstone) rock specimen

River Rock (Greywacke/Siltstone)

Siltstone / Argillaceous Greywacke

sedimentary

Chert (specifically Zebra Chert/Flint) rock specimen

Chert (specifically Zebra Chert/Flint)

Silicon Dioxide (SiO2)

sedimentary

Fancy Jasper rock specimen

Fancy Jasper

Silicon Dioxide (SiO2)

mineral

Red Jasper rock specimen

Red Jasper

Jasper (Silica/Silicon Dioxide, SiO2 plus iron inclusions)

sedimentary

Banded Iron Formation (BIF) rock specimen

Banded Iron Formation (BIF)

Banded Iron Formation (predominantly Hematite Fe2O3 and magnetite Fe3O4 alternating with Chert SiO2)

sedimentary

Red Quartzite Cobble rock specimen

Red Quartzite Cobble

Quartzite (primarily SiO2)

metamorphic

Basalt (River Stone) rock specimen

Basalt (River Stone)

Mafic volcanic rock

igneous

Diamond rock specimen

Diamond

Diamond (C)

mineral

Blue Sapphire rock specimen

Blue Sapphire

Corundum (Al2O3)

mineral

Greenstone rock specimen

Greenstone

Greenschist / Greenstone (containing Chlorite, Epidote, Actinolite)

metamorphic

Obsidian rock specimen

Obsidian

Volcanic Glass (70-75% SiO2)

igneous

Quartz Crystal with Inclusions rock specimen

Quartz Crystal with Inclusions

Silicon Dioxide (SiO2)

mineral

Amber rock specimen

Amber

Succinite

Organic Mineraloid

Clear Quartz (Rock Crystal) rock specimen

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

mineral

Opal rock specimen

Opal

Hydrated Amorphous Silica (SiO2·nH2O)

mineral

Green Aventurine rock specimen

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

metamorphic

Clear Quartz (Rock Crystal) rock specimen

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

mineral

Yellow Jade (Nephrite or Quartzite) rock specimen

Yellow Jade (Nephrite or Quartzite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jade-colored Quartzite (SiO2)

metamorphic

Lapis Lazuli rock specimen

Lapis Lazuli

Lazurite-rich metamorphic rock (complex silicate)

metamorphic

Obsidian rock specimen

Obsidian

Volcanic Glass (predominantly SiO2)

igneous

Fluorite rock specimen

Fluorite

Calcium Fluoride (CaF2)

mineral

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