Mineral (Synthetic)

Prehnite

Prehnite (Ca2Al2Si3O10(OH)2)

Celestite (Celestine)

Strontium sulfate (SrSO4)

Granite (Weathered)

Phaneritic Felsic Igneous Rock

Granite

Phaneritic Igneous Rock (Granite)

Granite Pebble

Granite (Phaneritic intrusive igneous rock)

Granite

Granite (Phaneritic igneous rock consisting of Quartz, Feldspar, and Mica)

Basalt (with possible Olivine inclusions)

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Basalt

Basalt (composition predominately plagioclase feldspar and pyroxene)

Shale

Fissile mudrock (composed primarily of clay minerals and quartz)

Nuummite

Nuummite (intergrowth of orthoamphiboles Anthophyllite and Gedrite, (Mg,Fe)7Si8O22(OH)2)

Diamond (in jewelry)

Carbon (C)

Milky Quartz

Silicon Dioxide (SiO2)

Yooperlite

Fluorescent Sodalite-bearing Syenite

Granite

Phaneritic Felsic Igneous Rock

Granite

Granite (Felsic Plutonic Rock)

Granite

Phaneritic Felsic Igneous Rock (composed of SiO2, KAlSi3O8, NaAlSi3O8)

Petrified Wood

Silicified wood (Quartz/Chalcedony - SiO2)

Red Sandstone (Old Red Sandstone)

Ferruginous Sandstone (SiO2 + Fe2O3)

Hag Stone

Porous sedimentary rock (typically Flint, Chert, or Sandstone) with naturally occurring holes

Quartzite with inclusions

Quartzite (SiO2)

Granite

Phaneritic intrusive igneous rock

Mica Schist

Mica Schist (Composition typically contains Muscovite: KAl2(AlSi3O10)(OH)2 or Biotite: K(Mg,Fe)3AlSi3O10(OH)2 along with Quartz and Feldspar)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (composed primarily of SiO2)

Quartz (Variety: Citrine or Tumbled Chalcedony)

Silicon Dioxide (SiO2)

Amazonite

K(AlSi3O8), Microcline (potassium feldspar)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Nephrite Jade

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

Cuprite

Cuprite (Copper(I) oxide, Cu2O)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite (SiO2 principal)

Rose Quartz

Silicon Dioxide (SiO2) with trace Titanium, Manganese, or Iron

Pyrite in Matrix (often with Chalcopyrite)

Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)

Muscovite Mica

Muscovite (Potassium Aluminum Silicate) - KAl2(AlSi3O10)(F,OH)2

Turquoise

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

Peridot

Olivine (Mg, Fe)₂SiO₄

Milky Quartz

Silicon Dioxide (SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Iolite (Cordierite)

Cordierite (Magnesium iron aluminum cyclosilicate), Mg2Al4Si5O18

Sandstone

Arenite (SiO2 based)