Metamorphic Rock (Composed Of Multiple Minerals)

Smoky Quartz

Silicon Dioxide (SiO2)

Gastropod Fossil (Snail Internal Mold)

Gastropoda; internal mold (steinkern), often composed of Calcium Carbonate (CaCO3) or Silica (SiO2)

Jadeite Jade

NaAlSi2O6 (Sodium Aluminum Silicate)

Granite

Intrusive Felsic Igneous Rock

Granite

Phaneritic Igneous Rock (Granite)

Granite

Phaneritic Granocrystalline Igneous Rock

Quartz

Silicon Dioxide (SiO2)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Pyrite

Iron Disulfide (FeS2)

Iron-stained Milky Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Unakite

Unakite (Epidotized Granite)

Venetian Gold Granite

Phaneritic Felsic Igneous Rock (Granite)

Charoite

Charoite (Hydrated potassium sodium calcium barium strontium silicate hydroxyfluoride)

Limonitic Iron Ore / Goethite

Hydrated Iron(III) oxide-hydroxide (primarily FeO(OH)·nH2O)

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

Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)

Nephrite Jade

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

Quartz (milky quartz variety)

Quartz (SiO₂)

Chakra Tumbled Stone Set

Various (including Amethyst [SiO2], Sodalite [Na8(Al6Si6O24)Cl2], Green Aventurine [SiO2], Red Jasper [SiO2], etc.)

Pyrite

Iron Disulfide (FeS2)

Orange Calcite

Calcium Carbonate (CaCO3)

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Black Sapphire (Basaltic Blue Sapphire)

Corundum (Al2O3)

Slate

Phyllo-silicate based metamorphic rock

Anthracite Coal

Anthracite (Carbon-based metamorphic rock)

Quartzite

Quartzite (SiO2-rich metamorphic rock)

Anthracite Coal

Anthracite (Carbon-rich metamorphic rock)

Anthracite Coal

Anthracite (Carbon-rich metamorphic rock)

Anthracite Coal

Low-grade metamorphic carbonaceous rock

Gneiss

High-grade foliated metamorphic rock

Ferruginous Quartzite (Iron-stained Quartzite)

Quartzite with Iron oxides (FeO(OH) / Fe2O3)

Chrysocolla and Azurite in Matrix

Hydrated copper phyllosilicate (Chrysocolla - Cu2H2Si2O5(OH)4) and Copper carbonate (Azurite - Cu3(CO3)2(OH)2)

Desert Rose (also known as Sand Rose)

Gypsum (CaSO4·2H2O) or Barite (BaSO4) with sand inclusions

Diorite (River Pebble)

Diorite (Intermediate intrusive igneous rock)

Chert / Flint Nodules in Limestone

Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)

Quartz (in matrix)

Quartz (SiO₂)

Granodiorite

Granodiorite (containing Quartz, Plagioclase, Orthoclase, Biotite/Hornblende)

Blue Sapphire

Corundum (Al2O3)

Peacock Ore (Chalcopyrite/Bornite)

Bornite (Cu5FeS4) or iridescent treated Chalcopyrite (CuFeS2)

Basalt with Weathering Crust

Extrusive mafic volcanic rock

Epidote in Granite Gneiss

Epidote bearing Orthogneiss (Ca2(Al,Fe)3(SiO4)3(OH))

Lake Superior Agate

Banded Chalcedony (Silicon Dioxide / SiO2)