Organic Gemstone (Not A Rock Or Mineral In The Traditional Sense, But Bio Mineralized Material)

Quartz

Silicon Dioxide (SiO2)

Red Sandstone

Arenite (primarily composed of SiO2 with Fe2O3 cement)

Agatized Chert / Chalcedony

Silicon Dioxide (SiO2)

Sandstone (Quartzose Sandstone)

Arenite (SiO2 principal component)

Pink Feldspar

Orthoclase Feldspar (KAlSi3O8)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Turquoise (beads)

Turquoise; CuAl6(PO4)4(OH)8·4H2O

Sandstone (Quartz Arenite)

Sandstone (SiO2 with possible mineral cements)

Moissanite

Silicon Carbide (SiC)

Diorite (River Pebble)

Intermediate plutonic igneous rock

Red Sandstone

Arenite (with Iron Oxide / Hematite), Formula: SiO2 (Quartz) + Fe2O3 (Hematite coating)

Sandstone

Arenite (primarily composed of SiO2 - Silicon Dioxide)

Turquoise

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

Turquoise

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

Sandstone (Water-worn)

Arenite

Red Sandstone (Arkose)

Clastic Sedimentary Rock (Lithic Arkose)

Moss Agate and Hematite

Silica (SiO2) with fibrous inclusions of Manganese or Iron; Hematite (Fe2O3)

Rose Quartz

Silicon Dioxide (SiO2) with trace titanium, iron, or manganese

Turquoise

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

Red Sandstone

Arenite (high iron oxide content)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Glauconitic Sandstone (Greensand)

Glauconitic Sandstone ((K, Na)(Fe3+, Al, Mg)2(Si, Al)4O10(OH)2)

Olivine (Peridot)

Olivine Group (Mg,Fe)2SiO4

Milky Quartz

Quartz / Silicon Dioxide (SiO2)

Sedimentary Breccia

Clastic Breccia (CaCO3/SiO2 matrix)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Diorite

Diorite (an intrusive igneous rock)

Amethyst

Silicon Dioxide (SiO2) with Iron impurities

Sandstone (likely Arkosic)

Clastic Sedimentary Rock (Sandstone)

Turquoise

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

Aquamarine and clear quartz

Aquamarine (Be3Al2Si6O18), Quartz (SiO2)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Basalt with Quartz/Feldspar Inclusions

Amygdaloidal or Porphyritic Mafic Volcanic Rock with Siliceous Veining

Red Sandstone

Arenite (Ferruginous Sandstone)

River Jasper (Chert/Chalcedony mix)

Silicon Dioxide (SiO2) with iron oxide and chlorite inclusions

Amethyst Sage Agate

Silicon Dioxide (SiO2) with trace minerals (Manganese/Iron oxides)

Dragon Blood Jasper (Lizard Stone/Septarian Chalcedony)

Epidote with Black Hornblende and White Quartz mixture

Sandstone

Arenite (composed primarily of SiO2)

Talc

Talc (Mg₃Si₄O₁₀(OH)₂)

Sandstone

Arenite (primarily Quartz, SiO2)

Chrysocolla

Hydrated copper silicate - Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)