Sedimentary Or Igneous (Host Environment)

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)

Granite (Pegmatitic)

Phaneritic Felsic Igneous Rock

Chert (often called Flint)

Chert (Cryptocrystalline Quartz, SiO2)

Quartz (White/Milky)

Silicon Dioxide (SiO2)

Fluorite (often referred to casually as 'Fluorspar' in industrial contexts)

Fluorite (CaF2)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Quartz in Limonite-rich Matrix

Silicon Dioxide (SiO2) with Goethite/Limonite FeO(OH)·nH2O

Muscovite Mica

Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2

Chert (Pink and Yellow Chert)

Microcrystalline Quartz (SiO2)

Zircon

Zircon (ZrSiO4)

Sandstone or Limestone

Sedimentary Rock

Quartz (Granular Milky Quartz fragment)

Silicon Dioxide (SiO2)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Quartzite (River Pebble)

Metamorphic Quartzite (SiO2)

Quartzite Pebble (River Rock)

Quartzite (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Gneiss (Granitic Gneiss)

Gneiss

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Carnelian

Silicon dioxide / Chalcedony (SiO2)

Gneiss

Gneiss

Gneiss

High-grade Metamorphic Gneiss

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Apatite

Fluorapatite, Chlorapatite, and Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))

Gneiss

High-grade regional metamorphic rock (Foliated)

Magnetite / Iron Ore

Magnetite (Fe3O4)

White Zircon

Zircon (Zirconium silicate, ZrSiO4)

Chalcedony with inclusions (Agate/Quartz)

Silicon Dioxide (SiO2)

Chalcedony (Moonstone variant or White Agate)

Silicon Dioxide (SiO₂)

Biotite Gneiss

Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Granite Gneiss

Gneiss (High-grade Metamorphic Rock)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Prehnite with Epidote inclusions

Prehnite: Ca2Al(AlSi3O10)(OH)2; Epidote: Ca2(Al,Fe)3(SiO4)3(OH)

Satin Spar (Selenite variant)

Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)

Yellow Calcite

Calcium Carbonate (CaCO3)

Quartz

Silicon Dioxide (SiO2)

Magnetite / Iron Ore

Magnetite (Fe3O4)