Metamorphic (Low Grade)

Greenstone / River Jadeite pebble

Metavolcanic rock / Chlorite or Actinolite-rich schist

Serpentinite (often called Jade or Nephrite substitute)

Serpentinite (composed primarily of Antigorite, Lizardite, or Chrysotile)

Slate

Slate (Regional metamorphic rock composed primarily of quartz, illite, and chlorite)

Greenstone

Metabasalt / Greenschist facies rock

Greenstone Pebble

Metabasalt (often containing chlorite, actinolite, or epidote)

Greenstone / Nephrite Jade

Tremolite-actinolite series (Ca2(Mg,Fe)5Si8O22(OH)2)

Serpentinite

Serpentine rock (Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4

Milky Quartz

Silicon Dioxide (SiO2)

Polished greenstone pebble

Greenstone (chlorite–epidote–actinolite-rich metamorphosed mafic rock)

Rounded green-gray pebble, likely greenstone

Greenstone (metamorphosed mafic rock; commonly chlorite- and actinolite-bearing)

Greenstone with quartz veins

Chlorite- and epidote-bearing metabasalt (greenstone), cut by quartz veins

Mottled green-and-white rock fragment

Possibly serpentinite or a chlorite-rich metamorphic rock; identification is uncertain from the photograph alone.

Greenstone pebble (likely metamorphosed basalt)

Greenstone, commonly chlorite- and actinolite-bearing metabasalt

Greenstone / altered basalt (probable)

Chlorite–epidote–actinolite-rich metabasalt; exact identification requires testing

Calcite-rich limestone (likely crystalline limestone/marble)

Calcite, CaCO₃; likely recrystallized carbonate rock

Polished tiger’s-eye

Quartz variety: fibrous golden-brown chalcedonic quartz, SiO₂

Likely polished blue-gray stone, possibly labradorite or slate

Tentatively labradorite (plagioclase feldspar, NaAlSi₃O₈–CaAl₂Si₂O₈) or blue-gray slate; identification is limited by the close-up image

Foliated metamorphic rock (likely slate or phyllite)

Slate/phyllite; chiefly quartz, mica, and chlorite

Banded Chert or Unakite-like Rock

Epidotized Granulite or Jasperoid Chert

Onyx (Calcite Onyx / Mexican Onyx)

Calcium Carbonate (CaCO3)

Likely micaceous metamorphic rock fragment

Probable phyllite or mica schist; quartz–muscovite-rich assemblage

Greenstone

Metabasalt / Greenschist

Anthracite Coal

Anthracite

Greenstone

Metabasalt (often contains Chlorite, Actinolite, and Epidote)

Pietersite

Brecciated Crocidolite in Quartz (Chalcedony)

Citrine

Quartz (Silicon Dioxide, SiO2)

Blue Kyanite

Kyanite (Al2SiO5)

Jadeite Jade

Jadeite (NaAlSi2O6)

Epidote and Quartz in Basalt

Epidote [Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)] in Metabasalt

Dark gray metamorphic rock, likely slate or phyllite

Slate/phyllite; chiefly fine-grained mica, chlorite, quartz, and clay-derived minerals

Schist (Greenschist / Mica Schist)

Schist (variable mineral composition, commonly containing quartz, feldspar, mica, chlorite)

Banded Jasper / Yellow Jasper with Chlorite or Epidote inclusions

Silicon Dioxide (SiO2) with iron oxide and silicate impurities

Polished tiger’s-eye

Quartz-rich aggregate with chatoyant fibrous crocidolite pseudomorphs; mainly SiO₂

Polished tiger’s eye

Quartz variety, SiO₂, with parallel fibrous amphibole pseudomorphs (crocidolite)

Dark gray foliated metamorphic rock, likely slate or phyllite

Slate/phyllite; chiefly quartz, mica, and chlorite

Nephrite Jade

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

Greenschist (Chlorite Schist)

Greenschist (containing chlorite, actinolite, and epidote)

Slate

Slate; fine-grained metamorphosed shale, commonly quartz–muscovite/chlorite rich

Slate

Slate; predominantly fine-grained phyllosilicates (muscovite/illite, chlorite) with quartz and possible iron oxides

Epidote

Epidote (Ca2(Al, Fe)3(SiO4)3(OH))

Greenstone (Prase / Metavolcanic)

Metamorphosed volcanic rock (Greenstone)

Emerald in Matrix (Quartz/Calcite)

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities