Metamorphic (Low Grade)

Weathered gray slate or phyllite pebble

Fine-grained, foliated metamorphic rock; exact identification requires closer examination

Greenschist

Greenschist metamorphic rock (chlorite-epidote-actinolite-albite assemblage)

Emerald

Beryl (Be3Al2(SiO3)6)

Lemon Jade

Nephrite / Jadeite (Sodium Aluminum Silicate / Calcium Magnesium Silicate)

Jadeite

Jadeite (NaAlSi2O6)

Tumbled ruby-bearing corundum (probable)

Corundum, aluminum oxide (Al₂O₃), colored red by chromium; possibly ruby

Slate

Metamorphic Pelitic Rock

Dark gray foliated metamorphic rock, likely slate or phyllite

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

White Jade

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

Likely slate fragment

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

Slate with Quartz Vein

Metamorphic pelitic rock with hydrothermal quartz vein

Small dark rock fragment, possibly shale or slate

Undetermined fine-grained silicate rock; visual identification is inconclusive

Green schist (probable)

Chlorite–mica schist; exact mineralogy cannot be confirmed from the photograph

Dragon Blood Jasper (Dragon Stone / Epidote-Piemontite/Jasper rock)

Epidote with Piemontite / Chalcedony aggregate

Likely greenstone (metamorphosed mafic rock)

Greenschist or altered basalt; exact identification is uncertain from the image

Likely slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals, quartz, and chlorite

Greenstone / altered mafic rock

Likely serpentinite or chlorite-rich metabasalt; exact identification requires testing

Weathered metamorphic rock, likely slate or phyllite

Fine-grained foliated rock, probably quartz–mica-rich phyllite (exact identification requires testing)

Greenstone (likely altered basalt or serpentinite)

Chlorite-rich metabasalt or serpentinite; exact identification requires testing

Epidote in Matrix

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

Sandstone and Quartzite Specimens

SiO2 with varying mineral/clastic inclusions

Dark gray foliated metamorphic rock, likely slate or phyllite

Slate/phyllite; commonly quartz, muscovite/illite, chlorite, and graphite or carbonaceous matter

Yellow Jade

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

Flagstone paving (likely slate or shale)

Slate, a fine-grained metamorphic rock composed mainly of quartz, mica, and chlorite; exact identification from the image is uncertain

Weathered greenstone (altered mafic rock)

Greenschist-facies metabasalt; typically chlorite, actinolite, epidote, and albite

Polished greenstone pebble

Likely chlorite- or actinolite-bearing greenstone (metamorphosed mafic rock)

Likely greenstone (altered basalt)

Chlorite–actinolite-bearing metabasalt; identification is tentative from the image

Weathered greenstone (metabasalt)

Chlorite–actinolite metabasalt; composition varies, commonly plagioclase with chlorite, actinolite, epidote, and amphibole

Likely slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz

Gray slate or fine-grained metamorphic rock

Slate–phyllite spectrum; predominantly fine-grained quartz, mica, and chlorite

Likely slate or fine-grained metamorphic rock

Slate–phyllite spectrum; commonly quartz, mica, and chlorite

Quartz-bearing greenstone (probable epidote–quartz rock)

Epidote–quartz schist/greenstone; chiefly quartz (SiO₂) and epidote [Ca₂(Al,Fe)₃(SiO₄)₃(OH)], with possible chlorite and feldspar

Greenstone (Epidosite/Altered Diorite)

Metabasalt or Meta-andesite / Epidotized Diorite

Greenstone / Metabasalt

Chlorite schist or Epidiorite

Greenstone

Metamorphic mafic rock (chlorite-actinolite-epidote schist)

Yellow Jade (Nephrite or Quartzite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jade-colored Quartzite (SiO2)

Iron-rich quartzite or ferruginous metamorphic rock

Ferruginous quartzite, likely hematite/goethite-bearing quartzite; SiO₂ with Fe₂O₃/FeO(OH)

Greenschist

Greenschist (comprising Actinolite, Chlorite, and Epidote)

Greenschist (Greenstone)

Greenschist

Weathered mica-rich metamorphic rock

Likely schist or phyllite; composition probably quartz, mica, and feldspar

Gray metamorphic rock, likely slate or phyllite

Fine-grained foliated rock, probably quartz–mica slate/phyllite

Jadeite

Jadeite (NaAlSi2O6)