Metamorphic (Low Grade)

Epidosite (Epidote-rich rock)

Epidotalite (primarily Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH))

Polished greenstone pebble

Likely serpentinite or chlorite-rich greenschist

Pearl and Garnet Glass

Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass

Jadeite

NaAl(Si2O6)

Jadeite

NaAl(Si2O6)

Mica Schist

Foliated Metamorphic Rock (Schist)

Likely serpentine-rich pebble

Serpentinite, composed mainly of serpentine-group minerals (e.g., antigorite, lizardite, or chrysotile)

Green Quartzite (Aventurine type)

Quartzite (principally Quartz, SiO2) with inclusions of Fuchsite

Emerald In Matrix

Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium

Quartzite with Chlorite

Metamorphic Quartzite (SiO2) with phyllosilicates

Anthracite Coal with Sulfur staining

Anthracite (Carbon C with impurities)

Greenstone (likely chlorite- or actinolite-rich metabasalt)

Metamorphosed mafic volcanic rock; commonly greenschist-facies basalt, composed chiefly of chlorite, actinolite, epidote, and albite

Greenstone (likely altered mafic rock)

Chlorite- and amphibole-bearing metabasalt; exact identification requires testing

Greenstone pebble

Greenstone, typically metamorphosed basalt or andesite; often contains chlorite, epidote, and actinolite

Tumbled greenstone (likely serpentine-rich)

Greenstone; commonly metamorphosed mafic rock composed of actinolite/chlorite with epidote and albite

Likely greenstone (metamorphosed basalt)

Metabasalt; commonly composed of chlorite, actinolite, epidote, and albite

Blue-gray metamorphic rock fragment

Likely slate or phyllite; exact identification is uncertain from the photograph

Anthracite Coal

Anthracite (Hard Coal)

Weathered dark metamorphic rock, likely slate or phyllite

Fine-grained foliated rock, probably slate/phyllite; exact identification requires testing

Likely black shale or slate fragment

Slate; predominantly fine-grained mica/clay minerals and quartz

Tumbled black-and-gold tiger’s-eye

Quartz pseudomorph after crocidolite; SiO₂ with iron oxides

Greenstone or Chlorite Schist

Greenschist / Chlorite schist

Milky quartz-rich rock

Quartz, SiO₂; possibly quartzite or massive vein quartz

Weathered greenish mineral specimen, possibly serpentine or epidote

Tentatively serpentine-group mineral (Mg3Si2O5(OH)4) or epidote (Ca2(Al,Fe)3Si3O12(OH)); identification is uncertain from the image alone

Jade (likely Nephrite Jade based on appearance)

Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)

Iron-stained slate or shale

Fine-grained, iron-oxide-stained pelitic rock; likely slate/phyllite, though the image alone cannot confirm the exact rock type

Green schist (likely chlorite schist)

Chlorite schist; commonly dominated by chlorite, actinolite, epidote, quartz, and feldspar

Greenstone (probable altered basalt)

Chlorite–epidote–actinolite-rich greenschist; composition commonly derived from basalt

Soapstone (talc-rich schist)

Talc schist; chiefly hydrated magnesium silicate, Mg₃Si₄O₁₀(OH)₂

Calcite-rich limestone or marble fragment

Calcite (CaCO₃), likely recrystallized carbonate rock

Likely greenstone (metamorphosed basalt)

Greenschist or chlorite–epidote altered basalt; commonly composed of chlorite, epidote, actinolite, albite, and quartz

Green Greenstone / Celadonite-bearing Metamorphic Rock

Greenschist / Celadonite / Serpentinitic pebble

Greenstone / altered mafic rock

Likely chlorite–actinolite metabasalt (greenschist); exact identification requires testing

Greenstone (Greenschist facies)

Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)

Greenstone

Greenschist (Greened Metabasalt)

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2), a variety of Actinolite-Tremolite

Greenstone

Metabasalt / Greenschist facies rock

Greenstone

Greenschist / Meta-basalt

Greenstone

Metabasalt

Tiger's Eye

Quartz with riebeckite inclusions (SiO2)

Stiped Slate Beach Pebble

Low-grade Metamorphic Slate with Quartz Vein (SiO2 on Phyllosilicate base)

Red Jasper

Silicon Dioxide (SiO₂)