Metamorphic Mineral

Mica (Lepidolite or Muscovite)

Phyllosilicate mineral (KAl2(AlSi3O10)(OH)2 for Muscovite)

Garnet (Almandine)

Almandine (Fe3Al2(SiO4)3)

Biotite in Host Matrix

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

Mica

Phlogopite or Biotite group (KMg3(AlSi3O10)(F,OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)

Green Kyanite

Kyanite (Al2SiO5)

Rhodonite

Manganese silicate (Mn,Fe,Mg,Ca)SiO3

Gneiss

Foliated Metamorphic Gneiss

Gneiss (with Quartz-Feldspar vein)

Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)

Rhodochrosite

Manganese carbonate (MnCO3)

Quartz (Milky/Crystalline)

Silicon Dioxide (SiO2)

Greenstone or Epidote-rich rock

Epidote or Chlorite schist/greenstone

Garnet Schist

Almandine Garnet-Mica Schist (X₃Y₂(SiO₄)₃)

Quartz

Silicon Dioxide (SiO2)

Epidote (with Quartz and Feldspar)

Epidote (unakalite/unite), Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)

Schist (Diamond Drill Core)

Mica Schist

Lapis Lazuli (Raw)

Lazurite-rich metamorphic rock; Na3Ca(Al3Si3O12)S

Rhodonite

Rhodonite (MnSiO3)

Quartz (White/Milky)

Silicon Dioxide (SiO2)

Mixed Gemstone Collection

SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)

Galena

Lead(II) sulfide (PbS)

Quartz (Milk Quartz / Massive Quartz)

Silicon Dioxide (SiO2)

Yellow Aventurine

Silicon Dioxide with inclusions (SiO2 + Muscovite/Fuchsite)

Quartz (Milky/Clear Fragment)

Silicon Dioxide (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Pyrite

Iron Disulfide (FeS2)

Pyrite

Iron Disulfide (FeS2)

Hematite

Iron (III) oxide (Fe2O3)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Pyrite

Iron Sulfide (FeS2)

Potassium Feldspar

Orthoclase (KAlSi3O8)

Yellow Calcite

Calcium Carbonate (CaCO3)

Moonstone

Orthoclase Feldspar (KAlSi3O8)

Biotite (Black Mica)

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

Citrine or Yellow Quartz

Silicon Dioxide (SiO2) with iron impurities

Pyrite (Iron Pyrites)

Iron Sulfide (FeS2)

Pyromorphite on Epidote

Pyromorphite [Pb5(PO4)3Cl] and Epidote [Ca2(Al2,Fe3+)(SiO4)3(OH)]

Pyrite

Iron Disulfide (FeS2)

Chalcopyrite

Chalcopyrite (CuFeS2)

Pyrite

Iron Sulfide (FeS2)

Banded Gneiss

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

Gneiss

Gneiss