Mineral In Metamorphic Rock

Quartz with Spessartine Garnet and Biotite

SiO2 (Quartz) with Mn3Al2(SiO4)3 (Spessartine)

Tumbled quartz-rich rock, possibly jasperized quartz or quartzite

Quartz (SiO₂), likely with iron-oxide staining and minor feldspar or other silicate minerals; exact identification is uncertain from the photograph

Serpentinite

Serpentinite (Mg, Fe, Ni)3Si2O5(OH)4

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, e.g., Antigorite, Lizardite, or Chrysotile)

Greenstone / Serpentinite

Serpentinite (complex of Mg, Fe, Ni, Al, Zn, Mn silicate minerals including Antigorite, Lizardite, and Chrysotile)

Gneiss (specifically a Granitic Gneiss specimen)

Gneiss (high-grade metamorphic rock primarily composed of Quartz, Feldspar, and Biotite/Amphibole)

Quartzite

Metamorphic Quartz (SiO2)

Quartz Pebble with Host Rock / Schist Matrix

Silicon Dioxide (SiO2) with Metamorphic Host Rock

Weathered iron-stained quartzite or sandstone cobble

Quartzite (quartz-rich rock), possibly ferruginous sandstone

Rhodonite

Manganese silicate (MnSiO3)

Pink Quartzite Pebble

Quartzite (SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Quartzite

Quartzite (primarily SiO2)

Garnet in Matrix (Eclogite)

Eclogite, featuring Almandine or Pyrope Garnet [X3Y2(SiO4)3]

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Quartz (Milky or Cloudy Quartz)

Silicon Dioxide (SiO2)

Rock Specimen

Unclassified rock specimen

Quartzite with Mafic Intrusion (Gneiss/Schist Contact)

Metamorphic Quartzite (SiO2) with Amphibole/Biotite Schist

White Marble

Metamorphic carbonate rock (primarily CaCO3)

Granitoid (Granite/Gneiss mix)

Phaneritic Felsic Igneous Rock

Lapis Lazuli

Lapis Lazuli (a rock type, not a single mineral, composed primarily of lazurite, calcite, and pyrite)

Epidote (or Epidote-rich rock)

Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).

Serpentinite

Serpentinite (composed mainly of Serpentine-group minerals: (Mg, Fe)3Si2O5(OH)4)

Unakite (likely)

Epidote–pink feldspar–quartz rock; commonly termed unakite

Lapis Lazuli

Lapis Lazuli (Complex rock mainly composed of Lazurite, Calcite, and Pyrite)

Green Aventurine

Silicon Dioxide (Quartz) with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Charnockite

Orthopyroxene-bearing granite (Charnockite)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)

Banded Gneiss

Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Biotite/Amphiboles)

Lapis Lazuli

Lapis Lazuli (Rock composed mainly of lazurite, calcite, and pyrite)

Quartzite Pebble (River Rock)

Quartzite (SiO2)

Greenstone

Metabasalt / Greenstone (low-grade metamorphic rock)

Quartz / Quartzite

Silicon Dioxide (SiO2)

Weathered quartz-rich metamorphic rock

Likely quartzite or quartz-rich gneiss; exact identification requires a fresh surface and testing

Quartz-rich rock, possibly milky quartz or quartzite fragment

Quartz (SiO₂), potentially quartzite if metamorphic

Iron-stained quartz-rich rock, possibly jasper/quartzite

Quartz (SiO₂) with iron-oxide staining; likely ferruginous quartzite or jasper

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Mica Schist

Crystalline Schist (often primarily Muscovite or Biotite sheet silicates)

Quartzite

Metamorphic Quartzite (SiO2-rich rock)

Quartzite (Pink / Peach)

SiO2 (Metamorphosed Quartz Sandstone)

Tumbled dark gray stone, likely basalt

Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, commonly with olivine