Mineral With Metamorphic Or Igneous Host

Pyrite

Iron Sulfide (FeS2)

Chalcopyrite

Chalcopyrite (CuFeS2)

Pyrite (Iron Pyrites)

Iron Sulfide (FeS2)

Turquoise (set in silver jewelry)

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

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Epidote

Epidote - {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Magnetite or Magnetic Iron Ore

Magnetite (Fe3O4)

Green Fluorite

Calcium Fluoride (CaF2)

Quartz in Matrix (possibly Basalt or Siltstone host)

Silicon Dioxide (SiO2) in Host Rock

Apache Tear (Obsidian)

Volcanic glass (SiO2 - Silicon Dioxide)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Pink Chalcedony

Silicon Dioxide (SiO2)

Epidote (with Quartz and Feldspar)

Epidote (unakalite/unite), Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)

Quartz Geode

Silicon Dioxide (SiO2)

Druzy Chalcedony (Agate Geode)

Silica (SiO2) - Cryptocrystalline Quartz with druzy macrocrystalline quartz

Orthoclase Feldspar

Potassium Aluminum Silicate (KAlSi3O8)

Quartz-veined Sedimentary Rock

Hydrothermally veined Clastic Sedimentary Rock (SiO2 veins in Matrix)

Druzy Quartz

Crystalline Silicon Dioxide (SiO2)

Quartz (likely a form of massive or vein quartz)

Quartz (SiO₂)

Turquoise in Matrix

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

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Quartz Geode

Silicon Dioxide (SiO2)

Chrysocolla and Azurite in Matrix

Hydrated copper phyllosilicate (Chrysocolla - Cu2H2Si2O5(OH)4) and Copper carbonate (Azurite - Cu3(CO3)2(OH)2)

Quartz

Silicon Dioxide (SiO2)

Smoky Quartz

Smoky Quartz (SiO2)

Limonite with Opal infusion

FeO(OH)·nH2O (Limonite) / SiO2·nH2O (Opal)

Turquoise

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

Turquoise

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

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Quartz Geode

Silicon Dioxide (SiO2) in Host Rock

Quartz Pebble (Water-Worn)

Silicon Dioxide (SiO2)

Quartz-encrusted Matrix

Silicon Dioxide (SiO2) with Ferruginous Sandstone

Gold in Quartz Ore

Hydrothermal Quartz with native Gold (Au)

Chalcopyrite

Chalcopyrite (CuFeS2)

Orange Calcite

Calcium Carbonate (CaCO3)

Blue Quartz

Quartz (Silicon Dioxide) with blue inclusions (SiO2)

Biotite Schist

Biotite Schist (predominantly K(Mg,Fe)3AlSi3O10(OH,F)2)

Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone.

SiO2 (Silicon Dioxide)

Ruby in Matrix

Corundum (Al2O3)

Quartz

Silicon Dioxide (SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Calcite

Calcium Carbonate (CaCO3)