Metamorphic (Low Grade)

Lapis Lazuli (Low Quality/Rough)

Lapis Lazuli (comprised of Lazurite, Calcite, and Pyrite)

Anthracite Coal

Anthracite

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

Quartzite with Chlorite

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

Picasso Jasper (Picasso Stone)

Metamorphosed Calcium Carbonate (Silicified Limestone)

Green Calcite

Calcite (CaCO3)

Anthracite Coal

Anthracite (Carbon C)

Serpentine

Antigorite-Lizardite-Chrysotile (Mg3Si2O5(OH)4)

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

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

Emerald

Beryl (Be3Al2(SiO3)6) colored by Chromium and/or Vanadium

Greenstone / Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Greenschist

Greenschist facies metamorphic rock; commonly chlorite–actinolite–epidote schist

Banded gneiss

Gneiss, commonly quartz–feldspar–biotite gneiss

Likely gneiss

Gneiss, composed chiefly of quartz, feldspar, and mica/amphibole

Tiger's Eye

Silicon Dioxide with Crocidolite inclusions (SiO2)

Tiger's Eye

Quartz pseudomorph after crocidolite, SiO2

Banded Jasper (Carved)

Microcrystalline Quartz (SiO2)

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Likely biotite-rich schist with a quartz/feldspar inclusion

Mica schist; chiefly quartz (SiO₂), feldspar, and biotite mica

Greenstone, likely serpentinite

Serpentinite; predominantly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), possibly with chlorite, talc, magnetite, or antigorite

Tumbled jasper or chert (tentative)

Microcrystalline quartz, SiO₂, likely opaque chalcedony/jasper

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Weathered quartz-bearing sandstone or quartzite

Quartzite (SiO₂-rich), possibly weakly metamorphosed sandstone

Rhodonite-bearing metamorphic rock

Rhodonite (MnSiO₃) in manganese-rich schist/gneiss, possibly with quartz and amphibole

Weathered iron-rich rock, possibly garnet schist or mica schist

Foliated metamorphic rock; likely mica schist with iron oxides and quartz, but exact identification is uncertain from the image

Quartzite pebble (likely)

Quartzite; predominantly microcrystalline quartz (SiO₂)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)

Eclogite

Eclogite

Weathered mica-rich schist

Mica schist, chiefly muscovite/biotite with quartz and feldspar

Anthracite Coal

Anthracite (Metamorphic/High-grade Sedimentary Coal)

Anthracite Coal

Anthracite

Unakite (weathered pebble)

Unakite: epidote-bearing granitoid, typically quartz + pink potassium feldspar + green epidote

Foliated shale or slate fragment

Fine-grained phyllite/slate, composed mainly of clay minerals, mica, and quartz

Polished tiger’s-eye / iron-rich quartzite

Quartz (SiO₂), commonly pseudomorphic tiger’s-eye with limonite/goethite and remnants of crocidolite fibers

Dark metamorphic pebble, likely slate or phyllite

Slate/phyllite; chiefly fine-grained mica and quartz, with possible chlorite and graphite

Greenstone (or River-tumbled Basalt / Greywacke with Epidote)

Metabasalt / Greenschist facies rock

Greenstone / River Siltstone

Metasedimentary Greenstone (Chlorite-rich Siltstone)

Greenstone

Greenschist (metamorphosed mafic igneous rock)

Banded calcite (likely polished limestone/marble fragment)

Calcite, CaCO₃; probable banded calcitic marble

Blue-gray metamorphic rock, possibly slate or phyllite

Likely quartz–mica-rich phyllite/slate; exact identification requires testing

Calcite-rich marble or limestone

Calcite (CaCO₃), likely recrystallized limestone (marble)