Mineral

Quartz with Pyrite and Iron Staining

Silicon Dioxide (SiO2) with Iron Disulfide (FeS2) inclusions

Blue Dumortierite Quartz

Dumortierite Inclusions in Quartz (SiO2 with Al7(BO3)(SiO4)3O3)

Granite

Granite

Fossilized Coprolite

Coprolite (fossilized feces)

Man-made Synthetic Material (Costume Faux Fur)

Synthetic Polymer (Polyester/Acrylic)

Peach Aventurine

Silicon Dioxide (SiO2) with inclusions

Pegmatite

Coarse-grained Igneous Rock (Granitic Pegmatite)

Granite Pebble

Granite (Phaneritic intrusive igneous rock comprising Quartz, Feldspar, and Mica)

Granite Pebble

Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica/amphibole)

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2) with iron and other mineral inclusions

Turquoise

Turquoise (CuAl6(PO4)4(OH)8·4H2O)

Red Sandstone

Sandstone (mainly SiO2 with Iron Oxide cement)

Turquoise

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

Azurite

Azurite (Cu3(CO3)2(OH)2)

Pyrite on Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Turquoise

Turquoise, CuAl6(PO4)4(OH)8·4H2O

Turquoise

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

Sandstone

Clastic Sedimentary Rock (composed primarily of Quartz: SiO2)

Fluorite

Calcium Fluoride (CaF2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Shale with Iron Staining

Fissile Argillaceous Sedimentary Rock

Sandstone (Ferruginous)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)

Sandstone

Arenite

Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

Red Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3 iron oxide staining)

Turquoise

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

Sandstone

Arenite (composed primarily of SiO2)

Granite (Fine-grained)

Phaneritic Felsic Igneous Rock

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Larimar

Pectolite (a blue variety of Pectolite)

Turquoise

Turquoise (Hydrated copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O)

Gneiss Pebble

Gneiss (High-grade metamorphic rock)

Amygdaloidal Basalt

Amygdaloidal Basalt containing Zeolite and Calcite inclusions

Arfvedsonite (often mistakenly sold as Astrophyllite)

Arfvedsonite [Na3(Fe2+)4Fe3+Si8O22(OH)2]

Sandstone

Arenite (SiO2 primarily)

Chrysocolla in Jasper (Chryso-Jasper)

Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O (Chrysocolla) + SiO2 (Jasper)

Sandstone (Quartzose Sandstone)

Arenite

Limestone Gravel

Calcium Carbonate (CaCO3)

Sandstone

Arenite (SiO2 principal)

Geode (Unopened)

Silicon Dioxide (SiO2) in sedimentary host rock

Pyrite

Iron Sulfide (FeS2)

Amazonite

Potassium Feldspar (KAlSi3O8)