Mineral In Metamorphic Rock

Likely raw quartz-bearing stone, possibly greenish quartz or calcite

Uncertain from photograph; possible quartz (SiO₂) or calcite (CaCO₃)

Orange Calcite

Calcium Carbonate (CaCO3)

Quartzite with Pyrite Inclusions

Metamorphic Quartz-rich Rock

Rounded quartz-rich pebble

Likely granitoid-derived quartz–feldspar rock; exact identification uncertain from image

Biotite Schist

Biotite Schist

Milky Quartz (Quartz Vein)

Silicon Dioxide (SiO2)

Foliated metamorphic rock, likely gneiss or schist

Biotite–quartz–feldspar gneiss/schist; exact identification requires a fresh surface and testing

Gneiss (Metamorphosed Granitic Rock)

Gneiss (composed mainly of quartz, feldspar, biotite, and/or hornblende)

Gneiss

Gneiss

Blue Apatite

Fluoroapatite (Ca5(PO4)3F)

Greenstone

Greenschist (Greened Metabasalt)

Quartzite Cobble / Quartz River Pebble

Silicon Dioxide (SiO2) - Quartzite / Quartz

Jasper and Epidote in Quartzite

Metamorphic rock containing microcrystalline quartz, epidote, and jasper

Red Garnet (Pyrope or Almandine)

Garnet Group (A3B2(SiO4)3)

Banded gneiss pebble

Gneiss, typically quartz–feldspar–mica; exact mineral composition requires testing

Biotite Mica

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

Granite Gneiss

Gneiss (High-grade Metamorphic Rock)

Green Slate Pebble (Serpentine / Greenschist Pebble)

Greenschist / Low-grade Metamorphic Rock

Pyrite

Iron Sulfide (FeS2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) with host rock (often Schist or Basalt)

Gneiss

Gneiss (High-grade metamorphic rock)

Granite Gneiss

Gneiss (High-grade Metamorphic Rock)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Foliated metamorphic rock, likely gneiss

Biotite–quartz–feldspar gneiss, possibly migmatitic gneiss

Quartzite with Mica Matrix

Metamorphic Quartz-Mica Schist/Quartzite

Gneiss

Gneiss (High-grade Metamorphic Rock)

Gneiss

Gneiss (High-grade metamorphic rock)

Granite-like gneiss

Foliated granitic gneiss, composed mainly of quartz, feldspar, and mica

Likely weathered mica schist fragment

Mica schist, chiefly muscovite/biotite mica with quartz and feldspar

Schist (Kyanite Schist)

Kyanite-Mica Schist (primarily Al2SiO5, KAl2(AlSi3O10)(OH)2, and SiO2)

Greenshist / Chlorite Schist

Chlorite schist (contains (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)

Polished dark stone fragment, possibly slate or schist

Fine-grained foliated metamorphic rock; exact mineral composition is indeterminate from the image

Quartz

Silicon Dioxide (SiO2)

Gneiss

Metamorphic rock of high-grade regional metamorphism

Rounded gray pebble, likely quartz-rich stone

Indeterminate; possibly quartzite or a weathered granitic pebble

Greenish altered rock, possibly serpentinite or chlorite-rich schist

Tentative: serpentine-group minerals, chiefly antigorite/lizardite, or chlorite–actinolite assemblage

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Greenstone (likely chlorite-rich metamorphic rock)

Greenschist; commonly composed of chlorite, actinolite, and epidote, with possible albite

Lapis Lazuli (polished cabochon/sphere)

Na8[Al6Si6O24]Sn with accessory minerals (Pyrite, Calcite)

Brecciated marble (decorative stone slab)

Calcite-rich marble breccia; chiefly calcite (CaCO₃), potentially with dolomite and minor iron oxides

Quartz Vein Rock

Silicon Dioxide (SiO2)