Mineral (Tectosilicate)

Moonstone

Orthoclase (Potassium Feldspar) - (K,Na)AlSi3O8

Quartz Vein in Host Rock (Gneiss/Schist)

Silicon Dioxide (SiO2) within a metamorphic matrix

Quartz Pebble (with Mica or Iron staining)

Silicon Dioxide (SiO2)

Lapis Lazuli

Lapis Lazuli (A complex rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Feldspar

KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8

Lepidolite with Quartz

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Granite Pebble (Salt and Pepper Granite)

Felsic Intrusive Igneous Rock (Granite)

Granite Gneiss

Gneiss (High-grade regional metamorphic rock)

Quartz Vein in Schist

Quartz (SiO2) in Mica Schist

Grey River Stone (Gneiss/Schist mix)

Foliated Metamorphic Rock (variable mineral formula)

Basalt with Epidote (Flowerstone-like texture)

Amygdaloidal Basalt (silicate mineral inclusions)

Conglomerate

Conglomerate

Chalcopyrite

Chalcopyrite (CuFeS2)

Quartz with Arsenopyrite

Silicon Dioxide (SiO2) with Iron Arsenic Sulfide (FeAsS)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Sardonyx Agate Sphere

Cryptocrystalline Quartz (SiO2) with iron oxide inclusions

Turquoise (set in silver jewelry)

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

Azurite and Malachite on Matrix

Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Sandstone (likely Ferruginous)

Sandstone (SiO2 with iron oxides)

Turquoise

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

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of Iron Oxide)

Hematite

Iron(III) oxide (Fe2O3)

Dalmatian Stone

Peralkaline rhyolite

Lapis Lazuli (polished cabochon)

Lazurite-rich metamorphic rock (approx. Na6Ca2Al6Si6O24(SO4,S,Cl)2)

Blue Apatite

Fluoroapatite (Ca5(PO4)3F)

Tiger's Eye (with Blue Tiger's Eye / Hawk's Eye)

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)

Limonite (Iron Ore)

Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)

Bauxite

Bauxite (Al2O3·2H2O)

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within a metamorphic matrix

Bauxite

Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Ruby in Kyanite

Corundum in Disthene (Al2SiO5 + Al2O3)

Fluorite (Green)

Calcium Fluoride (CaF2)

Quartz Pebble

Silicon Dioxide (SiO2)

Yellow Ochre / Limonite

Limonite (FeO(OH)·nH2O)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz pebble

Silicon Dioxide (SiO2)

Limonite (Ironstone Concretion)

Limonite (Hydrated iron(III) oxide-hydroxide, mixtures of FeO(OH)·nH2O)

Basalt with Quartz Vein

Basalt (SiO2 vein inclusion)