Metamorphic Or Igneous (Context Dependent)

Tumbled white quartz pebble

Quartz (silicon dioxide, SiO₂)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Greenschist (Chlorite Schist)

Greenschist (containing chlorite, actinolite, and epidote)

Potassium-Rich Silicate Clay (inferred from biological context)

Phyllosilicate group (likely Illite or Smectite within surrounding soil substrate)

Granite

Phaneritic plutonic rock (Quartz, Feldspar, Mica)

Gneiss

Gneiss (High-grade metamorphic rock)

Eclogite

Eclogite (Omphacite-Garnet rock)

Granite Gneiss with Garnet

Garnetiferous Gneiss

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Gneiss

High-grade regional metamorphic rock (Foliated)

Banded Gneiss

Gneiss (high-grade metamorphic silicate rock)

Muscovite Mica

Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2

Gneiss

Gneiss

Chalcopyrite

Chalcopyrite (CuFeS2)

Metagabbro / Epidote Gneiss

Epidote bearing Hornblende Gneiss

Milky Quartz

Silicon Dioxide (SiO2)

Biotite (Black Mica)

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

Orthoclase Feldspar

Potassium Aluminum Silicate (KAlSi3O8)

Fluorite (often referred to casually as 'Fluorspar' in industrial contexts)

Fluorite (CaF2)

Quartz-rich pegmatite (possibly quartz–feldspar rock)

Granite pegmatite; chiefly quartz (SiO₂) with feldspar and minor mica/iron staining

Quartz (Engineered Stone Countertop)

Silicon Dioxide (SiO2) within a resin matrix

Pyrite

Iron Sulfide (FeS2)

Gneiss

High-grade foliated metamorphic rock

Schist

Mica Schist (Metamorphic rock)

Gneiss

Gneiss (Foliated Metamorphic Rock)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Milky Quartz with Country Rock contact

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

Quartz-rich feldspathic pebble, possibly granite or granitic gneiss

Quartz–feldspar aggregate, likely granite; dark inclusion may be biotite, hornblende, or iron-oxide staining

Quartz with Mica and Feldspar

Granitic Pegmatite Fragment (SiO2 + KAlSi3O8 + KAl2(AlSi3O10)(OH)2)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Gneiss

Gneiss (High-grade metamorphic rock)

Gneiss

Gneiss (High-grade metamorphic rock)

Banded Gneiss

Gneiss (High-grade metamorphic rock)

Greenstone / Graywacke

Metagraywacke or Chlorite Schist

Garnet-Bearing Gneiss

Garnetiferous Feldspathic Gneiss

Pyrite

Iron Disulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Disulfide (FeS2)

Pegmatite with Black Tourmaline

Granitic Pegmatite with Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)