Mineral In Metamorphic Rock

Waterworn Pebble / Quartzite

Metamorphic/Sedimentary rock fragment

Greenschist

Greenschist facies metamorphic rock

Dark gray fine-grained stone, likely basalt

Basalt; chiefly plagioclase feldspar and pyroxene, commonly with minor olivine and iron oxides

Greenstone pebble (likely serpentinite)

Serpentinite, composed mainly of serpentine-group minerals

Garnet-bearing Quartzite

Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)

Tiger's Eye (Rough)

Pseudomorph of Quartz after Crocidolite (SiO2)

Common Quartz Pebble

Silicon dioxide (SiO2) rock fragment

Quartz Vein in Metamorphic Rock

Quartzite or Schist host with Quartz (SiO2) intrusion

Dyed Agate / Quartz

Silicon Dioxide (SiO2) with artificial dye

Green Aventurine

Quartz with fuchsite inclusions (SiO2)

Unidentified weathered rock fragments

Likely mixed quartz- and feldspar-bearing silicate material; exact identification requires testing

Quartz Veined Rock (Likely Graywacke or Quartzite)

Silicon Dioxide (SiO2) veins in Metasedimentary matrix

Pyrite in Matrix (Fool's Gold)

Iron Disulfide (FeS2)

Banded Metamorphic Rock

Gneiss or Schist

Quartzite with Schist layers

Metamorphosed Quartz-rich Rock (Mixed Schist/Quartzite)

Weathered green metamorphic rock, possibly serpentinite or greenstone

Likely serpentinite (serpentine-group minerals) or chlorite/epidote-rich greenschist; exact identification requires testing

Agate

Silicon Dioxide (Chalcedony), SiO2

Gneiss and Igneous Rock Collection

Foliated Metamorphic Rock (Gneiss) / Igneous Rocks

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Weathered, iron-stained rock (likely metamorphic)

Indeterminate from photograph; possibly quartz-rich gneiss or schist

Slickenside

Tectonic Fault Scarp Surface

Banded gneiss

Gneiss, commonly quartz–feldspar–mica gneiss

Epidotite (Unakite-related)

Epidote-rich rock

Dark gray metamorphic rock, likely slate or phyllite

Slate/phyllite; commonly quartz, muscovite/illite, chlorite, and minor feldspar

Greenschist

Greenschist facies rock

Gneiss Pebble

Gneiss

Slate

Slate (foliated metamorphic rock)

Slate

Slate (foliated metamorphic rock)

Banded gneiss

Foliated gneiss, likely quartz–feldspar–biotite or amphibole gneiss

Marble

Metamorphic Limestone (CaCO3)

Yellow Quartz

Silicon Dioxide (SiO2)

Serpentinite

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

Quartz Pebble (with Feldspar/Mica)

Granitic Quartz / SiO2 with KAlSi3O8

Clear Quartz

Silicon Dioxide (SiO2)

Painted River Rock

Artificially Coated Sedimentary Rock

Blue Agate (Dyed Chalcedony)

Silicon Dioxide (SiO2)

Veined Grey Metamorphic Pebble

Quartzo-feldspathic vein in Metabasalt / Serpentinite / Slate

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Tiger Iron

Tiger Iron (Composition: SiO2, Fe2O3, Fe3O4)

Quartz Vein

Silicon Dioxide (SiO2)

Dark, coarse-grained rock fragment (possibly amphibolite or gabbro)

Uncertain from the photo; likely amphibolite (hornblende-rich metamorphic rock) or a mafic igneous rock such as gabbro

Pyrite in Matrix

Iron Sulfide (FeS2)