Mineral Based Composite

Bronzite

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

Vesicular Basalt with Xenocrysts

Mafic Igneous Plutonic/Extrusive Complex

Quartz (Iron-stained or Rose variant)

Silicon Dioxide (SiO2)

Lepidolite

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

Citrine (likely Heat-Treated Amethyst)

Silicon Dioxide (SiO2)

Peacock Ore

Bornite (Cu5FeS4) or iridescent Chalcopyrite (CuFeS2)

Granitic Sand

Detrital sediment (predominantly Quartz, Feldspar, and Mica)

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Basalt with Quartz Veining

Amygdaloidal Basalt (predominately SiO2 and (Na,Ca)(Si,Al)4O8)

Lepidolite

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

River Pebble (Quartzite/Siltstone mixture)

Silicon Dioxide (SiO2) mixture with varied clastic minerals

Granite

Intrusive igneous felsic rock

Granodiorite (or Granite) Pebble

Phaneritic Felsic Igneous Pebble

Rutilated Quartz

Quartz with Rutile inclusions (SiO2 with TiO2 inclusions)

Moss Agate

Silicon dioxide (SiO2) with inclusions of hornblende or chlorite

Garden Quartz (Phantom Quartz)

Silicon Dioxide (SiO2) with various inclusions (often Chlorite, Hematite, or Iron)

Chert (Limestone-based)

Silicon dioxide (SiO2)

Lepidolite

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

Beryl (Aquamarine) in Matrix with Schorl

Be3Al2Si6O18 (Beryl) with NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)

White Topaz

Topaz - Al2SiO4(F,OH)2

Granite

Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Fuchsite

Chrome-bearing Muscovite [K(Al,Cr)2(AlSi3O10)(OH)2]

Lepidolite

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

White Topaz

Aluminum Silicate Fluoride Hydroxide, Al2SiO4(F,OH)2

White Topaz

Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)

Limestone

Sedimentary rock composed of Calcium Carbonate (CaCO3)

Chert (often colloquially called Flint)

Chert (Microcrystalline Quartz, SiO2)

Basalt with Quartz/Plagioclase Inclusions

Mafic volcanic rock (Basaltic)

Schist

Mica Schist (primarily composed of quartz, feldspar, and mica)

Amygdaloidal Basalt

Basalt with secondary amygdule minerals (likely Epidote or Chlorite)

Chert (with Limestone and Iron Oxide staining)

Cryptocrystalline Quartz (SiO2)

Lepidolite

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

Quartz Pebble

Silicon Dioxide (SiO2)

Limestone with Quartz/Calcite Veins

Sedimentary Limestone (CaCO3 with SiO2 or CaCO3 intrusions)

Dendritic Agate

Silicon Dioxide (SiO2) with inclusions

Gold (Elemental Metal)

Gold (Au)

Pyrite

Iron Disulfide (FeS2)

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Granodiorite

Granodiorite (intermediate intrusive igneous rock)

Montana Moss Agate

Chalcedony (SiO2) with Manganese/Iron oxide inclusions

Limestone

Calcium Carbonate (CaCO3)

Lepidolite

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