Mineral In Metamorphic Rock

Mica-rich metamorphic rock, likely schist

Biotite–muscovite schist, possibly with quartz and sulfide minerals

Tumbled dark metamorphic rock, likely amphibolite

Amphibolite; chiefly hornblende amphibole and plagioclase feldspar, with possible biotite and epidote

Blue-gray metamorphic rock, possibly slate or phyllite

Likely quartz–mica-rich phyllite/slate; exact identification requires testing

Fine-grained dark metamorphic rock, likely slate or phyllite

Slate/phyllite, composed mainly of mica-group minerals, quartz, and clay-derived minerals

Weathered quartz-rich metamorphic rock, possibly quartzite or vein quartz

Quartzite / massive quartz (SiO₂), identification uncertain from photograph

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with feldspar or mica impurities

Likely mica-rich metamorphic rock (schist or gneiss)

Biotite–quartz–feldspar schist/gneiss; exact identification is limited by the blurred image

Mica-rich metamorphic rock fragments

Biotite schist / mica schist (predominantly biotite, muscovite, and quartz)

Iron-rich metamorphic rock, possibly micaceous schist

Biotite–quartz schist or iron-rich phyllite (tentative visual identification)

Quartz-rich metamorphic rock, likely quartzite with mica

Quartzite; predominantly quartz (SiO₂) with probable muscovite/sericite mica and minor iron oxides

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline quartz (SiO₂), possibly with mica and feldspar

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, possibly with mica or iron-oxide impurities

Weathered quartz-rich pebble

Likely milky quartz (SiO₂), possibly a quartz-rich vein fragment

Tumbled quartz-rich pebble

Microcrystalline quartz (SiO₂), possibly milky quartz or chalcedony

Polished greenstone pebble

Likely serpentinite or chlorite-rich greenschist

Banded Gneiss

Gneiss (Foliated Metamorphic Rock)

Foliated metamorphic rock, likely mica schist

Mica schist, chiefly quartz + biotite/muscovite; possibly chlorite-bearing

Dark gray foliated metamorphic rock, likely slate or phyllite

Slate/phyllite; chiefly quartz, mica, and chlorite

Wavellite with Quartz

Al3(PO4)2(OH,F)3 & SiO2

Lapis Lazuli (Low Grade)

Lapis Lazuli (Metamorphic rock containing lazurite, calcite, and pyrite)

Quartz-bearing metamorphic rock, likely mica schist

Mica schist with quartz; commonly muscovite/biotite mica and SiO₂ quartz

Quartz-bearing metamorphic rock, likely quartzite

Quartzite, predominantly SiO₂, with possible feldspar and mica impurities

Weathered granite or granitic gneiss

Granite; primarily quartz, feldspar, and mica

Gneiss

Gneiss (Foliated Metamorphic Rock)

Small quartz-rich mineral fragment

Quartz (SiO₂), possibly milky or chalcedonic quartz

Quartz-Veined Gneiss or Metamorphic Rock with Quartz Veins

Quartz-veined metamorphic rock (Silicate mineral assemblage)

Pale greenish quartz-bearing rock, possibly serpentine or altered feldspar

Tentatively serpentinite-related rock (serpentine-group minerals) or altered granitic material; identification is uncertain from the photograph

Gneiss

Gneiss (Foliated Metamorphic Rock)

Weathered quartz-bearing metamorphic rock

Likely quartz–feldspar schist or gneiss, possibly with iron-oxide alteration

Slate

Slate (Metamorphic Rock)

Quartz-rich metamorphic rock, possibly quartzite

Quartzite; primarily crystalline silicon dioxide (SiO₂), with minor feldspar, mica, or iron oxides

Biotite (Black Mica)

Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2

Gneiss

Metamorphic Gneiss

Weathered iron-rich metamorphic rock

Likely iron-stained quartzite or metasedimentary rock; exact identification requires testing

Coarse-grained metamorphic rock, likely amphibolite or hornblende gneiss

Amphibolite; predominantly hornblende amphibole and plagioclase feldspar, possibly with quartz and biotite

Quartz-rich metamorphic rock, likely quartzite

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

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with feldspar or mica

Quartz-rich metamorphic rock, likely mica schist or quartzite

Quartz (SiO₂) with probable mica, feldspar, and dark accessory minerals

Dark metamorphic rock, likely biotite schist or gneiss

Quartz–feldspar–biotite metamorphic rock; exact identification requires a fresh surface and testing

Gneiss

Gneiss (a metamorphic rock)

Slate

Slate (Metamorphic rock)

Blue Apatite

Calcium phosphate mineral, Ca5(PO4)3(F,Cl,OH)