Metamorphic (Low Grade)

Leopard jasper (orbicular jasper)

Silicified volcanic rock, chiefly microcrystalline quartz/chalcedony (SiO₂) with feldspar and iron-oxide inclusions

White quartz fragment (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Dark shale or slate fragment

Carbonaceous shale, possibly low-grade slate; composition mainly clay minerals, quartz, and organic carbon

Dark gray metamorphic rock fragment

Likely slate or fine-grained schist; mineral composition cannot be confirmed from the image

Aquamarine

Beryllium aluminum silicate (Be3Al2Si6O18)

Quartz vein in greenstone/altered mafic rock

Quartz (SiO₂) with chlorite–epidote-rich metabasalt or greenstone

Polished tiger’s-eye

Tiger’s-eye quartz (fibrous chalcedony/quartz, SiO₂)

Argillite (with Barnacles)

Argillite (metamorphosed mudstone/shale)

Weathered gray metamorphic rock, likely phyllite or slate

Micaceous quartz–phyllosilicate rock; commonly quartz + muscovite/illite ± chlorite

Dark gray slate or phyllite cobble

Slate–phyllite, composed mainly of fine-grained mica, quartz, and chlorite

Tumbled greenstone (likely serpentine or chlorite-rich metamorphic rock)

Serpentinite, approximately Mg₃Si₂O₅(OH)₄, or chlorite-rich greenstone

Blue Kyanite

Kyanite (Al2SiO5)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Greenstone / Greenstone Pebble

Greenschist (metamorphosed basalt or gabbro)

Likely graphite-rich metamorphic rock (graphitic schist)

Graphitic schist; chiefly carbon (graphite) with quartz, mica, and possibly sulfides

Jadeite Jade

NaAlSi2O6 (Sodium Aluminum Silicate)

Banded gneiss pebble

Gneiss, typically quartz–feldspar–mica assemblage

Polished dark greenstone with quartz vein

Likely chlorite-rich metabasalt or greenschist with a quartz–feldspar vein

Fine-grained gray stone, likely slate or weathered basalt

Indeterminate; possible slate (foliated phyllite-grade shale)

Dark metamorphic rock, likely slate or phyllite

Foliated metapelite; commonly mica-rich quartz–clay mineral assemblage

Slate

Slate; fine-grained metamorphosed shale, commonly mica- and chlorite-rich

Slate

Slate; primarily fine-grained mica, chlorite, quartz, and clay minerals

Greenstone with Magnetite Veins

Metabasalt (Greenstone)

Lapis Lazuli

Na6Ca2(Al6Si6O24)(S,SO4,Cl)1-2 (primarily containing Lazurite with inclusions of Calcite and Pyrite)

Iron-stained quartz-rich rock, likely quartzite or silicified breccia

Quartz (SiO₂), possibly quartzite with limonite/goethite iron oxides

Gneiss

Foliated quartz–feldspar–mica gneiss

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Schist

Schist (various mineral compositions)

Unakite (likely epidote–feldspar rock)

Epidote–K-feldspar–quartz aggregate; commonly approximated as pink orthoclase/microcline + green epidote + quartz

Anthracite Coal

Anthracite

Quartz with Chlorite or Hornblende inclusions

Silicon dioxide (SiO2) with phyllosilicate or amphibole inclusions

Dark metamorphic cobble, likely slate or phyllite

Foliated metamorphic rock, probably carbonaceous slate/phyllite; exact identification requires testing

Brecciated Jasper (Polished)

Silicon Dioxide (SiO2) with Iron Oxide Impurities

Picasso Jasper (Picasso Stone)

Metamorphosed Calcium Carbonate (Silicified Limestone)

Green Calcite

Calcite (CaCO3)

Iron-rich breccia or hematite-bearing jasper

Hematite–quartz jasper (silica-rich ironstone), possibly brecciated

Weathered quartz-rich rock, possibly milky quartz or quartzite

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

Weathered quartz-rich rock, possibly quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂)

River Quartzite Pebble

Quartzite (primarily SiO2)

Mixed Mineral Collection (with Quartz, Beryl, and host rock)

Silicon Dioxide (Quartz), Be3Al2Si6O18 (Beryl), and associated Schist/Pegmatite

Quartzite with Chlorite

Metamosphosed Quartz Sandstone (SiO2 with (Mg,Fe)3(Si,Al)4O10(OH)2 inclusions)