Mineral In Metamorphic Rock

Gneiss

Banded Metamorphic Rock (Gneiss)

Gneiss

Gneiss (a metamorphic rock)

Quartz–mica metamorphic rock, likely schist

Quartz–muscovite/biotite schist; predominantly SiO₂ quartz with phyllosilicate micas

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica or feldspar

Grey Agate (Tumbled)

Silicon Dioxide (SiO2)

Greenschist

Greenschist (chlorite-epidote schist)

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Schist

Schist (Crystalline metamorphic rock)

Quartz

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock

Hydrothermal Quartz (SiO2) in Slates/Schists

Banded Slate or Siltstone with Quartz/Calcite Veins

Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)

Lapis Lazuli

(Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2 (Complex silicate rock)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Garnet Schist

Almandine Garnet-bearing Mica Schist

Quartz-veined metamorphic rock, likely greenschist or altered basalt

Chlorite–actinolite schist or metabasalt with a milky quartz vein

Unidentified gray rock/mineral specimen

Indeterminate; possibly quartz-rich rock or a metallic sulfide-bearing specimen

Mixed Tumbled Rocks and Minerals Collection

Mixed Minerals and Rocks (Quartz, Feldspar, Jasper, Agate, Lapis Lazuli, Sodalite, Rose Quartz, Fluorite, etc.)

Gneiss

Gneiss (Foliated Metamorphic Rock)

Gneiss

Metamorphic Gneiss

Gneiss

Gneiss (Metamorphic rock)

Gneiss

Gneiss (Metamorphic Rock)

Gneiss

Metamorphic Gneiss

Quartz on Schist

Silicon Dioxide (SiO2) on Foliated Metamorphic Rock

Unakite

Epidotized Granite

Gneiss

Gneissic Metamorphic Rock

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly quartz (SiO₂), with minor iron-oxide and mica impurities

Banded Agate (Gray/Brown)

Silicon Dioxide (SiO2)

Gneiss

Foliated Metamorphic Rock (Gneiss)

Slate

Slate (Metamorphic Rock)

Gneiss with Quartz Veining

Gneiss (High-grade Metamorphic Rock)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Epidote

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

Fuchsite (Green Muscovite)

K(Al,Cr)2(AlSi3O10)(OH)2

Clear Quartz (Faceted Crystal)

Silicon Dioxide (SiO2)

Quartz-veined Granite or Gneiss Pebble

Silicate-rich metamorphic rock fragment

Gneiss

Foliated Metamorphic Rock

Likely weathered gneiss

Foliated metamorphic rock, commonly quartz–feldspar–mica gneiss

Muscovite mica

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Fuchsite Gneiss or Schist

Muscovite (variety Fuchsite) within Metamorphic Host Rock

Fuchsite

K(Al,Cr)2(AlSi3)O10(OH)2