Mineral In Metamorphic Rock

Schist

Lepidoblastic Mica Schist

Schist (Biotite/Mica Schist)

Medium-grade regional metamorphic rock (rich in Phyllosilicates)

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Quartzite pebble with Mafic inclusions

Quartzite (SiO2)

Quartz (Druzy) in host rock

SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)

Banded Gneiss

Gneiss (quartz-feldspar-biotite metamorphic rock)

Garnet-Bearing Schist

Almandine Garnet Schist

Small rounded pebble, likely quartz-rich stone

Indeterminate from photograph; possibly microcrystalline quartz (SiO₂) or a weathered silicate pebble

Weathered quartz-rich cobble, possibly milky quartz with iron staining

Quartz (SiO₂), likely with iron-oxide/hydroxide coatings and minor host-rock inclusions

Polished green aventurine (likely)

Quartzite dominated by quartz (SiO₂), commonly containing fuchsite mica

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Banded Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Milky Quartz (with Iron staining)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Epidosite (Epidote-rich rock)

Epidosite (consisting primarily of Epidote: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

Likely quartz fragment

Quartz (silicon dioxide, SiO₂), possibly milky quartz or quartz-rich rock

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Serpentinite

Serpentinite (composed primarily of mineral group (Mg,Fe,Ni,Al)3Si2O5(OH)4)

Nuummite

Nuummite (Orthoamphibole rock composed of Anthophyllite and Gedrite, (Mg,Fe)7Si8O22(OH)2)

Blue Quartzite

Metamorphic Rock (rich in Quartz, SiO2 with inclusions of Dumortierite or Magnesio-riebeckite)

Greenstone

Greenschist (Metamorphosed Mafic Rock)

Serpentine (Nephrite-like River Cobble)

Serpentinite (Hydrous Magnesium Iron Silicate)

Green Schist

Greenschist (composed of Chlorite, Actinolite, and Epidote)

Serpentinite

Serpentine rock (Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4

Greenstone

Greenschist / Meta-basalt

Eclogite

Eclogite (Pyrope garnet and Omphacite pyroxene)

Corundum (Sapphire variant)

Aluminum Oxide (Al2O3)

Rhodonite

Rhodonite, manganese inosilicate — MnSiO₃; the specimen may include quartz, feldspar, and black manganese-oxide minerals in the matrix

Quartz

Silicon Dioxide (SiO2)

Quartzite with Epidote

Meta-quartzite containing Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Almandine Garnet in Schist Matrix

Almandine - Fe3Al2(SiO4)3

Likely weathered quartz-bearing rock (uncertain identification)

Possibly quartz-rich granite or granitic aplite; exact identification requires a clearer, larger image and tests

Gneiss

Gneiss

River Pebble (Gneiss or Quartzite mixture)

Metamorphic rock (Commonly Gneissic)

Quartz Vein in Metamorphic Rock

Silicon Dioxide (SiO2) within Metasedimentary host

Diamond Drill Core (Greenschist and Quartzite)

Chlorite Schist / Meta-quartzite (Metamorphic Rock Core Sample)

Tumbled or naturally etched mica-rich mineral specimen, likely muscovite

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂; possibly phlogopite mica

Unakite

Altered Granite (Epidotized Granite)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Gneiss (Granitic Gneiss)

Gneiss (from German Gneis, related to 'spark')

Quartz Pebble (Citrine-colored or Stained Quartz)

Silicon Dioxide (SiO2)