Igneous (Anthropogenic)

Biotite Schist

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

Black Tourmaline

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Anyolite (Ruby in Zoisite)

Zoisite with inclusions of Hornblende and Ruby (Ca2Al3(SiO4)3(OH))

Pyrite

Iron Sulfide (FeS2)

Muscovite Mica

KAl2(AlSi3O10)(F,OH)2

Diorite (River Cobble)

Phaneritic Intermediate Plutonic Rock

Graphic Granite

Graphic Granite (Granite Pegmatite)

Granite

Granite (Felsic Plutonic Rock / SiO2 + Al2O3 + K2O + Na2O + CaO + FeO + MgO)

Dalmation Stone (frequently called Dalmatian Jasper)

Peralkaline Quartz-Feldspar Rock

Dalmatian Stone (often called Dalmatian Jasper)

Peralkaline Quartz-Feldspar Rock with Arfvedsonite (formerly believed to be Jasper)

Granite Pebble

Granite (Phaneritic intrusive igneous rock)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Amethyst

Silicon Dioxide with trace Iron (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Iron-stained or Ferruginous)

Silicon Dioxide (SiO2)

Olivine (likely Peridot variety)

Olivine Mineral Group (specifically Forsterite-Fayalite solid solution series); Chemical formula: (Mg,Fe)2SiO4

Granite

Granite (felsic intrusive igneous rock)

Granite

Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).

Olivine (Peridotite)

(Mg,Fe)2SiO4 (Magnesium Iron Silicate)

Granite

Granite (Felsic intrusive igneous rock)

Granite

Phaneritic plutonic rock (SiO2 typically >69%)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Gold and Silver (in jewelry form)

Gold (Au) and Silver (Ag)

Astrophyllite

Astrophyllite (K2NaFe7Ti2Si8O26(OH)4F)

Milky Quartz (Common Quartz)

Quartz (Silicon Dioxide, SiO2)

Schorl (Black Tourmaline)

Sodium Iron Aluminum Borosilicate Hydroxide; NaFe2+3Al6Si6O18(BO3)3(OH)3OH

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Quartz (Druzy)

Silicon Dioxide (SiO2)

Quartz with Mica inclusions (Gold-colored Mica)

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (Phlogopite/Muscovite) inclusions

Basalt

Mafic Volcanic Rock (composed of plagioclase, pyroxene, and olivine)

Sodalite Syenite

Sodalite-bearing Syenite (Na8(Al6Si6O24)Cl2)

Granite Pebble

Intrusive Felsic Igneous Rock (primarily SiO2 with Al2O3, K2O, Na2O)

Olivine (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Granite Glacial Erratic

Granite (Phaneritic Quartz-Feldspar Plutonic Rock)

Obsidian

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

Granite

Granite

Granite

Phaneritic Plutonic Igneous Rock (primarily composed of quartz, alkali feldspar, and plagioclase)

Dalmation Stone (Dyed)

Peralkaline rhyolite

Granite

Granite (a felsic intrusive igneous rock)

Sodalite (blue beads) and Clear Quartz (clear beads)

Sodalite: Na4Al3Si3O12Cl; Quartz: SiO2

Amazonite

Amazonite (KAlSi3O8) - a variety of Microcline Feldspar

Pyrite

Iron Pyrite (FeS₂)