Mineral And Metamorphic Rock

Quartzite Pebble with Feldspar Vein

Quartzite (SiO2) with Feldspar (KAlSi3O8)

Quartzite

Quartzite (primarily SiO2)

Quartzite (or Ferruginous Quartzite)

Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 impurities)

Schist

Mica Schist

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Serpentinite

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

Agate

Silicon Dioxide (Chalcedony), SiO2

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

Pyrite in Slate

Iron Sulfide (FeS2) in Slate host matrix

Quartz with Spessartine Garnet and Biotite

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

Serpentinite

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

Quartzite

Metamorphic Quartz (SiO2)

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)

Quartz Pebble with Host Rock / Schist Matrix

Silicon Dioxide (SiO2) with Metamorphic Host Rock

Rhodonite

Manganese silicate (MnSiO3)

Weathered iron-stained quartzite or sandstone cobble

Quartzite (quartz-rich rock), possibly ferruginous sandstone

Gneiss

Gneiss (Metamorphic rock of variable composition, typically SiO2 rich)

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]

Quartz-rich translucent pebble, possibly iron-stained quartz or chalcedony

Quartz (SiO₂), potentially microcrystalline quartz (chalcedony)

Milky quartz (likely quartz vein fragment)

Quartz, silicon dioxide (SiO₂)

Weathered quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂), possibly quartzite with iron-oxide staining

Chalcopyrite (Peacock Ore)

Chalcopyrite (CuFeS2)

Quartz (Milky or Cloudy Quartz)

Silicon Dioxide (SiO2)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Quartzite with Mafic Intrusion (Gneiss/Schist Contact)

Metamorphic Quartzite (SiO2) with Amphibole/Biotite Schist

Rock Specimen

Unclassified rock specimen

White Marble

Metamorphic carbonate rock (primarily CaCO3)

Dark gray foliated metamorphic rock, likely slate or phyllite

Slate/phyllite; commonly quartz, muscovite/illite, chlorite, and graphite or carbonaceous matter

Serpentinite

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

Granitoid (Granite/Gneiss mix)

Phaneritic Felsic Igneous Rock

Epidote (or Epidote-rich rock)

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

Green Aventurine

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

Unakite (likely)

Epidote–pink feldspar–quartz rock; commonly termed unakite

Lapis Lazuli

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

Milky quartz (rough quartz fragment)

Quartz, silicon dioxide (SiO₂)

Charnockite

Orthopyroxene-bearing granite (Charnockite)