Igneous

Browse igneous specimens identified by the Rock Identifier community.

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

mineral

Orthoclase Feldspar

Potassium Feldspar (KAlSi3O8)

mineral

Arfvedsonite in Quartz (also labeled as Astrophyllite or Nuummite by collectors)

[Na][Na2][Mg4Fe2+](Si8O22)(OH)2 in SiO2

metamorphic

Olivine/Peridot

Magnesium Iron Silicate (Mg,Fe)2SiO4

mineral

Opal

Hydrated Silica (SiO2·nH2O)

mineral

Citrine

Silicon Dioxide (SiO2)

mineral

Lapis Lazuli

Na8[Al6Si6O24]Sn (Lazurite-rich metamorphic rock)

metamorphic

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

mineral

Moonstone

Orthoclase (Potassium aluminum silicate - KAlSi3O8)

mineral

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

mineral

Gold Nugget

Native Gold (Au)

mineral

Fluorite

Calcium Fluoride (CaF2)

mineral

Quartz (Milky/Crystalline)

Quartz (Silicon Dioxide, SiO2)

mineral

Garnet and Quartz

Pyrope or Almandine (Red Garnets) and Quartz (Center Stone)

mineral

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

mineral

Quartz Crystal (specifically Rock Crystal)

Silicon Dioxide (SiO2)

mineral

Gneiss

Gneiss (High-grade Metamorphic Rock)

metamorphic

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Peach Moonstone

Potassium Aluminum Silicate (KAlSi3O8)

mineral

Lemon Quartz (Orizaba/Citrinated Quartz)

Silicon Dioxide (SiO2) with iron impurities/treatment

mineral

Pyrite (Iron Pyrite)

Iron Disulfide (FeS2)

mineral

Banded Agate

Cryptocrystalline Quartz (SiO2)

mineral

Gneiss (Banded Gneiss)

Gneiss

metamorphic

Chalcedony (Smoky Quartz or Agate nodule fragment)

Silicon Dioxide (SiO2)

mineral

Blue Apatite

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

mineral

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Black Tourmaline

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

mineral

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

mineral

Agate (Carnelian-like)

Chalcedony (Silicon Dioxide, SiO2)

mineral

Rose Quartz

Silicon Dioxide with trace inclusions (SiO2)

mineral

Blue Sapphire

Corundum (Al2O3)

mineral

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Magnetite

Magnetite (Fe3O4)

mineral

Iridium sand or Osmium-Iridium nugget

Iridosmine / Osmiridium (Platinoid grouping)

mineral

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese

mineral

Sodalite

Sodium aluminum silicate chloride (Na8(Al6Si6O24)Cl2)

mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

mineral

Smoky Quartz

Silicon Dioxide (SiO2)

mineral

Mica Schist

Schist (Muscovite/Biotite Schist)

metamorphic

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Unakite

Unakite Epidosite (Granite with epidote and orthoclase)

metamorphic

Clear Quartz Fragment

Quartz (Silicon Dioxide, SiO2)

mineral