Metamorphic (Low Grade)

Tumbled dark green stone, likely serpentinite or greenstone

Serpentinite (antigorite/lizardite-rich), or chlorite–amphibole greenstone

Green schist (probable chlorite–actinolite schist)

Chlorite–actinolite schist; commonly composed of chlorite, actinolite, epidote, albite, and quartz

Slate

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

Greenstone

Metabasalt / Chlorite Schist

Nephrite Jade / Pounamu

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Epidote in Quartz

Epidote (Ca2(Al2,Fe3+)3(SiO4)3(OH)) / Quartz (SiO2)

Weathered greenstone pebble

Metamorphosed mafic rock, commonly metabasalt or greenschist (exact identification requires testing)

Serpentine-rich metamorphic stone

Serpentinite, chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile) with possible quartz, magnesite, and magnetite

Greenish rock with white veins, possibly epidote or chlorite bearing rock with quartz/calcite veins

Altered mafic rock or Epidosite

Quartzite Pebbles

Quartzite (primarily SiO2)

Anthracite Coal

Anthracite

Polished golden-brown banded stone, likely tiger’s eye

Tiger’s eye (quartz with fibrous crocidolite pseudomorphs; SiO₂)

Weathered gray metamorphic rock, likely slate or phyllite

Foliated metapelite; composition commonly quartz, mica, and chlorite

Chlorite-rich metamorphic rock, likely greenschist

Greenschist; commonly composed of chlorite, actinolite, epidote, albite, and quartz

Muscovite Schist

Muscovite Mica Schist (KAl2(AlSi3O10)(OH)2)

Tumbled quartz-rich pebble

Quartz (SiO₂), likely milky quartz or quartzite fragment

Greenstone (Celadonite-bearing Volcanic)

Hydrothermally altered basalt or andesite with Celadonite (K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2)

Pink-and-white quartz-rich rock, likely rose quartz in matrix

Quartz (SiO₂), possibly rose quartz hosted in quartzite or feldspathic rock

Greenschist (Greenstone)

Chlorite schist (primarily Chlorite-Epidote-Actinolite-Albite)

Serpentine (Serpentinite)

Serpentinite (complex silicate group including lizardite, chrysotile, and antigorite)

Anthracite Coal

Anthracite (Metamorphic Coal)

Gneiss

Banded gneiss; quartz–feldspar–mica rock

Red Jasper (Beach Pebble)

SiO2 (Microcrystalline Quartz with Hematite inclusions)

Brown Jasper / River Pebble

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

Garnet (Spessartine / Almandine)

Fe3Al2(SiO4)3 to Mn3Al2(SiO4)3 (Nesosilicate)

Greenish quartz (likely prase/chalcedony)

Quartz, SiO₂; possibly green chalcedony or chlorite-included quartz

Jadeite Jade

NaAlSi2O6 (Sodium Aluminum Silicate)

Quartz / Quartzite

Silicon Dioxide (SiO2)

Anthracite Coal

Anthracite (Carbon-rich metamorphic rock)

Epidote

Epidote; Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

Micaceous schist (likely biotite schist)

Biotite–quartz–feldspar schist; commonly containing muscovite and/or garnet

Schist

Mica Schist

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

Weathered greenstone

Metabasalt (greenstone), likely chlorite–actinolite–epidote rock

Rough Sapphire (Corundum)

Corundum (Al2O3)

Tumbled serpentine

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and carbonate

Milky Quartz (Quartz Vein)

Silicon Dioxide (SiO2)

Anthracite Coal

Anthracite (Highly Metamorphosed Coal)

Jade (Nephrite or Jadeite)

Nephrite: Ca2(Mg,Fe)5Si8O22(OH)2; Jadeite: NaAlSi2O6

Anthracite Coal

Anthracite (Metamorphic/High-grade Sedimentary Coal)

River Quartzite Siltstone

Quartz-rich Meta-siltstone (SiO2 dominated)