Igneous And Metamorphic

Browse igneous and metamorphic specimens identified by the Rock Identifier community.

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

mineral

Pyrite

Iron Disulfide (FeS2)

Mineral

Gold Ore

Native Gold (Au) in Matrix

mineral

Ruby (Corundum)

Al2O3 (Aluminium oxide with Chromium impurities)

Mineral

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide)

mineral

Quartz

Silicon Dioxide (SiO2)

mineral

Orthoclase (Potassium Feldspar)

KAlSi3O8 (Potassium Aluminum Silicate)

mineral

Quartz (Milky or Rough Quartz)

Silicon Dioxide (SiO2)

mineral

Banded Gneiss

Gneiss (Metamorphic rock composed of feldspar, quartz, and mica)

metamorphic

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Aventurine Quartz

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

metamorphic

Yellow Quartz (Citrine/Yellow Chalcedony)

Silicon Dioxide (SiO2)

mineral

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

metamorphic

Mica Group Minerals

There isn't a single scientific name as 'Mica' refers to a group of phyllosilicate minerals. Common scientific names include Muscovite (KAl₂ (AlSi₃O₁₀)(OH)₂), Biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH)₂), Phlogopite (KMg₃AlSi₃O₁₀(OH)₂), and Lepidolite (K(Li,Al)₃(Al,Si,Rb)₄O₁₀(F,OH)₂).

Mineral

Gneiss

Gneiss (High-grade regional metamorphic rock)

Metamorphic

Foliated Gneiss (River-Worn Pebble)

Gneiss (High-grade Regional Metamorphic Rock)

metamorphic

Gneiss

Gneiss (High-grade regional metamorphic rock)

metamorphic

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

metamorphic

Lapis Lazuli (Lazurite crystals on Marble)

Lazurite / (Na,Ca)8[(S,Cl,SO4,OH)2|(AlSiO4)6]

metamorphic

Gneiss (with Quartz and Mica)

Gneiss

metamorphic

Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)

Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)

Metamorphic