Mineral And Metamorphic Rock

Likely dark mineral or rock fragment

Indeterminate from image; possibly a dark silicate mineral such as hornblende, biotite, or basalt

Schist (likely Mica Schist)

Mica Schist

Agate

Silicon Dioxide (Chalcedony), SiO2

Gneiss

Gneiss (Metamorphic Rock)

Clear quartz crystal (tentative)

Quartz, silicon dioxide (SiO₂)

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

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

Aquamarine

Beryl (Be3Al2Si6O18 with Fe impurities)

Milky quartz (rough quartz)

Quartz, silicon dioxide (SiO₂)

Garnet Schist

Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Gneiss (with Quartz Vein / Pegmatite Banding)

Metamorphic Gneiss

Schist

Schist (Metamorphic Rock)

Milky quartz

Quartz, silicon dioxide (SiO₂)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Likely basalt (possibly weathered volcanic rock)

Basalt; predominantly plagioclase feldspar and pyroxene, with possible olivine and iron oxides

Rounded pale quartz-rich pebble

Likely milky quartz or quartzite (SiO₂); exact identification is uncertain from the photograph

Clear quartz (rock crystal)

Quartz, silicon dioxide (SiO₂)

Unidentified dark mineral or rock specimen

Indeterminate from the severely blurred image; possible dark igneous rock or opaque mineral

Quartzite pebble

Quartzite (SiO2 with iron oxide impurities)

Quartz-rich rock, likely milky quartz

Quartz (SiO₂), possibly a massive quartz aggregate

Epidote

{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Quartz-Veined Slate or Greenstone

Metamorphic rock with quartz vein (SiO2)

Rounded, banded metamorphic cobble

Likely gneiss or foliated quartz-rich metamorphic rock; exact identification is uncertain from the photograph.

Milky quartz with iron-oxide staining

Quartz, silicon dioxide (SiO₂), likely massive or granular aggregate

Clear quartz pebble

Quartz (silicon dioxide, SiO₂)

Weathered quartz-rich metamorphic rock, likely milky quartz or quartzite

Quartz (SiO₂), possibly quartzite with iron-oxide staining and dark inclusions

Greenish metamorphic rock (possibly chlorite schist)

Chlorite-rich schist; exact identification is uncertain from the image

Weathered gneissic metamorphic rock

Gneiss, likely quartz–feldspar–mica gneiss

Iron-rich metamorphic rock, likely magnetite–hematite-bearing ironstone

Banded or massive iron formation (BIF), chiefly hematite (Fe₂O₃) and magnetite (Fe₃O₄), with quartz and possible iron silicates

Granitic Gneiss

Gneiss (Metamorphic Rock)

Iron-stained milky quartz cluster

Quartz (SiO₂), with brown iron-oxide staining

Coarse-grained gray metamorphic rock, likely gneiss

Biotite–quartz–feldspar gneiss (probable)

Pyrite (Fool's Gold) in Matrix

Iron Disulfide (FeS2)

Likely slate

Slate, a fine-grained metamorphic rock composed mainly of clay-derived mica minerals and quartz

Clear quartz crystal (likely quartz fragment)

Quartz, silicon dioxide (SiO₂)

Garnet in Schist (Mica Schist with Garnet Inclusion)

Garnetiferous Mica Schist (X3Al2(SiO4)3)

Likely milky quartz crystal fragment

Quartz (silicon dioxide, SiO₂)

Pyrite-bearing metamorphic rock (probable pyrite schist or sulfide ore)

Pyrite (FeS₂) in a foliated, quartz–mica-rich host rock; exact identification requires testing

Granitic gneiss (weathered, rounded cobble)

Foliated granitoid; primarily quartz, feldspar, and mica (composition commonly approximates granite)

Quartz vein fragment

Quartz (SiO₂), likely milky quartz with iron-oxide staining

Talc

Talc (Mg₃Si₄O₁₀(OH)₂)