Metamorphic (Low Grade)

Greenschist (Greenstone)

Greenschist

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)

Yellow Jade

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

Tumbled ruby-bearing corundum (probable)

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

Emerald

Beryl (Be3Al2(SiO3)6)

Porphyritic Andesite or Basalt

Porphyritic Intermediate/Mafic Igneous Rock

Jadeite

Jadeite (NaAlSi2O6)

Weathered mica-rich metamorphic rock

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

Sandstone and Quartzite Specimens

SiO2 with varying mineral/clastic inclusions

Slate

Metamorphic Pelitic Rock

Epidote in Matrix (Unakite-related)

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

Dark gray foliated metamorphic rock, likely slate or phyllite

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

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

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)

Weathered iron-rich rock, likely shale or slate

Probably ferruginous shale (iron-oxide-stained mudstone); exact identification requires testing

Rounded gray-green pebble, likely basaltic or metamorphic

Indeterminate mafic rock; possibly basalt, diabase, or greenstone

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Epidote

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

Greenstone (Greenschist)

Greenschist facies rock (containing chlorite, epidote, actinolite)

Epidote

Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Iron-rich quartzite or ferruginous metamorphic rock

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

Weathered quartz-rich rock, possibly milky quartz or quartzite

Quartz (SiO₂), potentially quartzite if metamorphic

Ruby (Raw Corundum)

Corundum (Al2O3) with Chromium traces

Gray metamorphic rock, likely slate or phyllite

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

Jadeite (Jade Ring)

NaAlSi2O6 (Sodium Aluminum Silicate)

Dark gray metamorphic pebble, likely slate or phyllite

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

Lapis Lazuli (Low Grade)

Lapis Lazuli (Metamorphic rock containing lazurite, calcite, and pyrite)

Jade Bangle (Jadeite)

Jadeite, NaAlSi2O6

Raw Emerald (Emerald Beryl)

Beryl (Be3Al2Si6O18) with chromium/vanadium impurities

Banded Slate Pebble

Metamorphosed Mudstone / Slate

Jadeite

Jadeite (NaAlSi2O6)

Epidote

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