Mineral And Metamorphic Rock

Blue-gray foliated metamorphic rock, likely slate or phyllite

Slate (fine-grained metamorphosed shale), possibly phyllite; mineral proportions cannot be confirmed from the image

Dark weathered metamorphic rock, likely schist or phyllite

Undetermined; probably mica-rich quartz–feldspar schist/phyllite

Gneiss (Banded Gneiss Cobble)

Gneiss

Tumbled green serpentine (probable)

Serpentine-group minerals, chiefly antigorite/lizardite; commonly Mg₃Si₂O₅(OH)₄

Tumbled serpentine

Serpentine-group minerals, chiefly antigorite/lizardite (Mg₃Si₂O₅(OH)₄)

Mica Schist / Granite

Mica Schist (Silicate metamorphic rock)

Garnet-Mica Schist

Garnetiferous Porphyroblastic Schist

Likely serpentine

Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; approximate formula Mg₃Si₂O₅(OH)₄

Moonstone

Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8

Weathered quartz-rich rock, possibly milky quartz or quartzite

Quartz (SiO₂), potentially quartzite if metamorphic

Green Aventurine

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

Quartz Vein in Hematitic Siltstone

Hydrothermal Quartz (SiO2) in Ferriferous Matrix

Tumbled green aventurine quartz

Aventurine quartz, silicon dioxide (SiO₂) with dispersed fuchsite or other mica inclusions

Garnet in Schist or Pegmatite

Almandine Garnet (Fe3Al2(SiO4)3) in host rock

Schist

Mica Schist

Quartz-rich metamorphic rock, likely quartzite

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

Milky quartz (quartz-rich rock)

Quartz, silicon dioxide (SiO₂)

Weathered mica-rich schist

Muscovite–biotite schist, possibly quartz-bearing

Mixed tumbled river pebbles and beach stones

Polymictic alluvial gravel; components include quartz, chert, jasper, sandstone, and altered volcanic rocks

Quartz Crystal Cluster on Matrix

Silicon Dioxide (SiO2)

Milky quartz (rough quartz specimen)

Quartz, silicon dioxide (SiO₂)

Quartz (Orange/Pink variety)

Silicon Dioxide (SiO2)

Likely slate or fine-grained metamorphic rock

Slate/phyllite; predominantly fine-grained mica, chlorite, and quartz

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂ with minor iron-oxide staining and possible feldspar/mica

Quartz with Mica/Host Rock

Silicon Dioxide (SiO2) with Phyllosilicates

Glaucophane Schist (Blueschist)

Blueschist facies metamorphic rock

Milky quartz

Quartz (silicon dioxide, SiO₂)

Gneiss (specifically Granitic Gneiss)

Gneissic Metamorphic Rock

Banded metamorphic rock, likely gneiss

Gneiss; predominantly quartz–feldspar with mica/amphibole minerals

Dark mafic metamorphic rock, likely amphibolite

Amphibolite; chiefly hornblende amphibole and plagioclase feldspar

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Gneiss

Metamorphic Gneiss

Milky quartz

Quartz (silicon dioxide, SiO₂), massive variety

Serpentine

Antigorite, Lizardite, or Chrysotile (Mg3Si2O5(OH)4)

Quartz in Greenstone

Metamorphic rock with quartz vein (SiO2 / mixed silicates)

Epidosite (Unakite-related)

Epidosite (composed primarily of Epidote and Quartz)

Dark gneiss or migmatitic amphibolite

Band ed gneiss; composition likely quartz–feldspar–biotite/amphibole, possibly migmatite

Hematite

Iron Oxide (Fe2O3)

Banded Gneiss

Metamorphic Gneiss

Milky Quartz with Country Rock contact

Silicon Dioxide (SiO2) in contact with Metamorphic/Igneous rock

Lapis Lazuli

Lapis Lazuli (Primary mineral: Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)