Mineral Precipitate (Anthropogenic Context)

Smoky Quartz (Herkimer-style)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Milky Quartz with Chlorite inclusions

Silicon Dioxide (SiO2) with Chlorite group minerals

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Chakra Tumbled Stone Set

Various (including Amethyst [SiO2], Sodalite [Na8(Al6Si6O24)Cl2], Green Aventurine [SiO2], Red Jasper [SiO2], etc.)

Granite Pebble

Granite (composed primarily of Quartz, Feldspar, and Mica)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Turquoise

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

Red Sandstone

Arenite (primarily Quartz, SiO2, with Iron Oxide cementing agent)

Dendritic Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides

Turquoise

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

Fossilized Bone Fragment

Permineralized Vertebrate Bone (Hydrox yapatite replaced by Silica or Calcite)

Ironstone (with Limonite/Goethite)

Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O and Hematite Fe2O3)

Azurite and Malachite on Matrix

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

Brown Sandstone

Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Botryoidal Goethite

Goethite (α-Fe3+O(OH))

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (SiO2 + Fe2O3)

Hematite

Ferric oxide (Fe2O3)

Orbicular Granite

Orbicular Granitoid

Tiger's Eye

Tiger's eye (Pseudomorph of Quartz after Crocidolite), SiO2

Pyrite

Iron Sulfide (FeS2)

Green Calcite

Calcium Carbonate (CaCO3)

Ferruginous Sandstone (Gozzan)

Iron-rich clastic sedimentary rock with Limonite/Goethite

Ferruginous Quartz

Quartz (Silicon Dioxide, SiO2) with iron oxide inclusions

Jasper (Red/Brown Variety)

Jasper (Silicon Dioxide, SiO2 plus Iron Oxide impurities)

Red Jasper

Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)

Travertine

Travertine (CaCO3 - Calcium Carbonate)

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Bronzite

Enstatite (var. Bronzite), (Mg,Fe)SiO3

Chrysocolla

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

Himalayan Salt (Halite)

Halite (NaCl) with trace minerals

Quartz

Silicon Dioxide (SiO2)

Serpentinite

Serpentine rock (Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4

Blue Apatite

Apatite-(CaF), Ca5(PO4)3F

Bauxite (Pisolitic Bauxite)

Bauxite (mixture of Hydrous Aluminum Oxides)

Greenstone (Epidote/Chlorite Rich Rock)

Metabasalt (often contains Epidote Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Pink/Orange Variety)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)