Mineral In Metamorphic Rock

Quartzite with Feldspar and Mica (Granitic Gneiss Pebble)

Metamorphic Rock / Quartzite / Granitic Gneiss

Biotite Schist

Metamorphic Rock (Schist)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz–feldspar–mica metamorphic rock, likely gneiss

Gneiss; composition commonly quartz (SiO₂), feldspars, biotite/hornblende, and minor accessory minerals

Quartz Vein in Sedimentary Matrix

Silicon Dioxide (SiO2) with host rock

Lapis Lazuli (Low Grade)

Lapis Lazuli (Metamorphic rock containing lazurite, calcite, and pyrite)

Quartz

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Agate

Chalcedony (SiO2) with impurities

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Lapis Lazuli

Lazurite-rich metamorphic rock

Tiger Iron

Tiger Iron (Composition: SiO2, Fe2O3, Fe3O4)

Quartz with Mica

Silicon Dioxide (SiO2) with Mica group inclusions

Muscovite Mica

Muscovite: KAl2(AlSi3O10)(OH)2

Gneiss (specifically Granitic Gneiss)

Gneissic Metamorphic Rock

River Stone (possibly Gneiss)

Metamorphic Gneiss

Biotite Schist (likely)

Biotite Schist (rock), Biotite (mineral)

Quartz Vein / Milky Quartz

Silicon Dioxide (SiO2)

Gneiss (Metamorphosed Granitic Rock)

Gneiss (composed mainly of quartz, feldspar, biotite, and/or hornblende)

Biotite Schist

Biotite Schist

Garnet-bearing Schist

Almandine Garnet [Fe3Al2(SiO4)3] in Micaceous Schist

Veined Grey Metamorphic Pebble

Quartzo-feldspathic vein in Metabasalt / Serpentinite / Slate

Tiny amber-colored crystal fragment

Indeterminate; possibly quartz, feldspar, mica, or a sulfide mineral

Blue Agate (Dyed Chalcedony)

Silicon Dioxide (SiO2)

Agate

Silicon Dioxide (Chalcedony), SiO2

Epidote

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

Likely weathered mica schist fragment

Mica schist, chiefly muscovite/biotite mica with quartz and feldspar

Schist (Kyanite Schist)

Kyanite-Mica Schist (primarily Al2SiO5, KAl2(AlSi3O10)(OH)2, and SiO2)

Greenshist / Chlorite Schist

Chlorite schist (contains (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)

Serpentine

Antigorite/Lizardite (Mg, Fe)3Si2O5(OH)4

Muscovite Mica

Muscovite (Potassium Aluminum Silicate) - KAl2(AlSi3O10)(F,OH)2

Milky Quartz

Silicon Dioxide (SiO2)

Shale (possibly Carbonaceous or Oil Shale)

Argillaceous Sedimentary Rock

Gneiss

Foliated Metamorphic Rock (Gneiss)

Ruby in Zoisite

Anyolite

Milky Quartz

Silicon Dioxide (SiO2)

Epidote

Epidote (Ca2(Al, Fe)3(SiO4)3(OH))

Quartz Veined Rock (Likely Graywacke or Quartzite)

Silicon Dioxide (SiO2) veins in Metasedimentary matrix

Greenstone (or Greywacke/Metasediment Pebble)

Metamorphosed Mafic Rock / Chlorite Schist

Greenstone (Epidote/Chlorite Rich Rock)

Metabasalt (often contains Epidote Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Gneiss

High-grade Metamorphic Gneiss