Mineral (Man Made Composite)

Aquamarine with Sunstone

Aquamarine (Be3Al2Si6O18), Sunstone (Na,Ca)Al(Si,Al)Si2O8

Ferruginous Sandstone (Gozzanous)

SiO2 (Quartz) with FeO(OH) (Goethite) or Fe2O3 (Hematite) coating

Gneiss

Foliated Metamorphic Rock (Gneiss)

Sandstone

Arenite (lithic or quartz sandstone)

Red Sandstone (Iron-rich)

Ferruginous Sandstone (SiO2 with Iron Oxides)

Turquoise and Hematite

CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Fe2O3 (Hematite)

Quartz-veined Sedimentary Rock

Hydrothermally veined Clastic Sedimentary Rock (SiO2 veins in Matrix)

Sandstone (likely with Quartz Veining)

Arenite (primarily SiO2)

Gneiss

Gneiss (a type of metamorphic rock)

Sandstone

Arenite (primarily SiO2)

Pyrite

Iron Sulfide (FeS2)

Gneiss (with Quartzite and Mica)

Gneiss

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Diorite

Phaneritic plutonic rock (dominated by plagioclase feldspar and hornblende)

Sandstone

Arenite (primarily SiO2)

Granite or Pegmatite in host rock

Granitoid / Felsic Intrusive Rock

Staurolite (Fairy Stone)

Staurolite (formula: Fe2+2Al9Si4O23(OH))

Okenite (in Zeolite matrix)

Okenite (CaSi2O5 · 2H2O)

Quartzite

Quartzite (Primary mineral: Silicon Dioxide, SiO₂)

White Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Limonite Concretion (Ironstone)

Limonite (Hydrated Iron(III) Oxide-Hydroxide, FeO(OH)·nH2O)

Limonite (vibrant yellowish-brown iron oxide)

Limonite (FeO(OH)·nH2O)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated Iron Oxide)

Granite

Granite (Mainly Quartz, Feldspar, and Mica)

Gneiss (specifically a granitic gneiss cobble)

Gneiss (high-grade regional metamorphic rock)

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (SiO2 dominated)

Red Sandstone

Arenite (Ferruginous Sandstone)

Granite

Granite (Phaneritic Acidic Igneous Rock)

Limonitic Sandstone with Inclusion

Limonitic Quartz Sandstone (primarily SiO2 with FeO(OH)·nH2O)

Chrysocolla

Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·n(H2O)

Granite

Granite (Felsic Plutonic Rock)

Milky Quartz (with Chlorite/Mineral Inclusions)

Silicon Dioxide (SiO2)

Bauxite

Bauxite (mixture of hydrous aluminum oxides: Al(OH)3 & AlO(OH))

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Calcite (Yellow/Orange variety - sometimes called Honey Calcite)

Calcite

Sandstone

Arenite (SiO2 based)

Chrysocolla on Matrix

Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O

Schorl (Black Tourmaline) in Quartz or Feldspar Matrix

NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl) in Granitic Pegmatite

Banded Gneiss

Gneiss (pronounced "nice")

Garden Quartz (Lodalite)

Silicon Dioxide (SiO2) with mineral inclusions

Diamond (in Gold Jewelry)

Carbon (C)