Mineral And Metamorphic Rock

Greenstone, likely altered basalt

Metabasalt (chlorite–actinolite–epidote assemblage), likely greenschist-facies greenstone

Quartz-bearing feldspar pegmatite (likely with mica/tourmaline)

Granitic pegmatite; chiefly quartz (SiO₂) and feldspar, with dark mica or tourmaline

Quartz-veined weathered host rock

Quartz (SiO₂) in a likely altered limestone or metamorphic carbonate host

Schist

Metamorphic Rock (Schist)

Banded gneiss pebble

Gneiss, commonly quartz–feldspar–mica gneiss

Schist

Metamorphic rock (Schist)

Banded Slate

Slate (Metamorphosed Siltstone/Mudstone)

Milky quartz (massive quartz)

Quartz, silicon dioxide (SiO₂)

Quartz-rich metamorphic rock, likely quartzite or quartz vein in schist

Quartz (SiO₂) with probable mica, feldspar, and iron-oxide staining

Banded gneiss

Gneiss, commonly quartz–feldspar–mica gneiss

Polished gray metamorphic pebble, likely marble or quartzite

Uncertain; possibly calcitic marble (CaCO₃) or quartzite (SiO₂) with dark mineral veining

Garnet-bearing metamorphic rock, likely garnet schist or amphibolite

Almandine garnet (Fe₃Al₂Si₃O₁₂) in mica- or amphibole-rich matrix

Schist

Mica Schist

Quartz fragment

Quartz, silicon dioxide (SiO₂)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Greenstone / serpentine-rich metamorphic rock

Likely serpentinite, composed mainly of serpentine-group minerals (antigorite, lizardite, or chrysotile), with possible magnetite and chlorite

Mixed rock and mineral collection

Multiple specimens; visible pieces may include quartz, calcite, agate/chalcedony, jasper, and dyed or coated materials

Foliated Gneiss

Gneiss (Metamorphic Rock)

Banded Gneiss

Gneiss (Metamorphic Rock)

Greenschist (or Serpentinite with Manganese Dendrites)

Greenschist facies metamorphic rock

Quartz with Schist Inclusion

Crystalline Silicon Dioxide (SiO2) with Muscovite/Biotite Schist

Hematite

Iron Oxide (Fe2O3)

Sandstone or Quartzite

Arenite (if sedimentary) / Quartzite (if metamorphic)

Milky Quartz with Chlorite Schist Inclusions

Quartz (SiO2) with Chlorite Group silicates (typically (Mg,Fe)3(Si,Al)4O10(OH)2)

Weathered garnet-bearing gneiss

Quartz–feldspar–mica gneiss with almandine garnet, chiefly Fe₃Al₂(SiO₄)₃

Milky quartz

Quartz (SiO₂)

Quartz Vein in Matrix (Gneiss/Schist)

Silicon Dioxide (SiO2) in Metamorphic Rock Matrix

Black tourmaline (schorl)

Schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Weathered quartz-rich pebble

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

Milky quartz (rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

Milky Quartz

Silicon Dioxide (SiO2)

Polished greenstone pebble

Likely serpentinite or chlorite-rich greenschist

Likely dark green-gray metamorphic pebble

Indeterminate; possibly chlorite schist, serpentinite, or amphibolite

Banded Gneiss

Gneiss (Foliated Metamorphic Rock)

Milky quartz fragment

Quartz, silicon dioxide (SiO₂)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Wavellite with Quartz

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

Weathered granite or granitic gneiss

Granite; primarily quartz, feldspar, and mica

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Gneiss

Gneiss (Foliated Metamorphic Rock)

Small quartz-rich mineral fragment

Quartz (SiO₂), possibly milky or chalcedonic quartz