Mineral (Metamorphic Pseudomorph)

Quartz on Host Rock

Silicon Dioxide (SiO2)

Gneiss

Gneiss

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Blue Quartzite

Quartzite with inclusions (often Dumortierite or Magnesio-riebeckite), SiO2

White Marble

Recrystallized Calcite (CaCO3)

Green Aventurine (Quartzite)

Silicon Dioxide (SiO2) with inclusions of Fuchsite (Mica)

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).

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Banded gneiss pebble

Gneiss, composed chiefly of quartz, feldspar, and mica/amphibole

Lapis Lazuli

Lapis Lazuli (A complex rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Lapis Lazuli

Lapis Lazuli (Mineral composition: Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2, Calcite, and Pyrite)

Lapis Lazuli (Raw)

Lazurite-rich metamorphic rock; Na3Ca(Al3Si3O12)S

Emerald (Beryl)

Be₃Al₂Si₆O₁₈ (Chromium/Vanadium-bearing Beryl)

Green Quartz / Aventurine

Silicon Dioxide (SiO2) with inclusions

Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone.

SiO2 (Silicon Dioxide)

Milky Quartz

Silicon Dioxide (SiO2)

Blue Quartz (Aventurine)

Silicon Dioxide (SiO2) with fibrous inclusions (commonly Dumortierite)

Ruby and Sapphire Cluster Ring

Corundum (Al2O3)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(F,OH)2)

Quartz (Clear or Cloudy)

Silicon Dioxide (SiO2)

Banded gneiss pebble

Gneiss, typically quartz–feldspar–mica banded rock

White Marble

Calcite-rich Metasomatized Carbonate (CaCO3)

Epidote with Quartz

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Quartzite (with Iron Staining)

Metamorphosed Quartz Sandstone (SiO2)

Sapphire

Corundum (Al2O3)

Serpentinite (with Pyrite/Garnet inclusions)

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3Si2O5(OH)4

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Gneiss

Metamorphic Gneiss (High-grade regional metamorphism)

Slate

Foliated Metamorphic Rock

Felsic gneiss, likely granitic gneiss

Quartz–feldspar–mica gneiss; commonly quartz + plagioclase/K-feldspar + biotite or hornblende

Lapis Lazuli (Low Grade)

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2)

Weathered greenish rock fragment

Indeterminate; possibly epidote- or chlorite-bearing altered silicate rock

Mixed rock and mineral collection

Multiple specimens; visible pieces may include quartz, calcite, agate/chalcedony, jasper, and dyed or coated materials

Quartz pebble

Silicon dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Quartz with Oxides

Silicon Dioxide (SiO2)

Citrine

Silicon Dioxide (SiO2)

Quartz / Quartz Geode Fragment

Silicon Dioxide (SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Milky Quartz Pebble with Iron staining

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)