Metamorphic (Low Grade)

Greenstone (Metabalt)

Chlorite-actinolite schist (Greenstone)

Greenstone

Metamorphic Greenstone (Greenschist facies)

Likely basaltic or mafic metamorphic rock

Fine-grained mafic rock, probably basalt or altered basalt; composition mainly plagioclase and pyroxene, possibly chlorite/epidote

Greenstone (likely chlorite-rich metamorphic rock)

Chlorite-bearing greenschist; exact identification requires testing

Epidotite

Epidotite (Epidote content > 50%)

Stream-worn greenstone (likely serpentinite or altered basalt)

Serpentinite, chiefly serpentine-group minerals; possibly chlorite–actinolite greenstone

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Ruby (Corundum)

Corundum (Aluminum Oxide with Chromium), Al2O3:Cr

Black Beach Pebble (Basalt / Slate)

Basalt / Metamorphic Slate pebble

Quartzite with Epidote

Meta-quartzite containing Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Garnet Schist

Almandine Garnet in Micaceous Schist

Jadeite (Jade)

Jadeite, NaAlSi₂O₆

Epidote in Quartz

Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) in Quartz (SiO2)

Slate

Slate (Foliated Metamorphic Rock)

Stilbite

Stilbite-Ca (NaCa4Mg[Al9Si27O72]·28H2O)

Jasper (Red/Brown)

Microcrystalline Quartz (SiO2) with Iron Oxide inclusions

Red Jasper Pebble

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Burmese Jadeite

Jadeite (NaAlSi2O6)

Carnelian

SiO2 (Silicon Dioxide with Iron Oxide impurities)

Jade (Jadeite or Nephrite)

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

Epidotite (Unakite-related)

Epidote-rich rock

Serpentinite

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

Greenstone

Metamorphic mafic rock (greenschist facies)

Blue-gray metamorphic rock, likely slate or schist

Foliated phyllite–schist; chiefly quartz, mica, and chlorite (exact identification requires testing)

Phyllite (possibly low-grade greenish slate)

Foliated metamorphic rock composed mainly of very fine-grained quartz, mica, and chlorite; approximate composition varies and has no single fixed chemical formula

Jadeite Jade

NaAlSi2O6 (Sodium Aluminum Silicate)

Blue-gray foliated metamorphic rock, likely slate or phyllite

Slate (fine-grained metamorphosed shale), possibly phyllite; mineral proportions cannot be confirmed from the image

Quartz on Greenstone

Silicon Dioxide (SiO2) on Altered Igneous Geologic Unit

Blue Kyanite

Kyanite (Al2SiO5)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Tumbled quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky or smoky quartz

Slate / Greenschist

Foliated Metamorphic Rock (Greenschist/Slate)

Greenstone (likely altered basalt or greenschist)

Greenschist-facies mafic rock; commonly chlorite–actinolite–albite ± epidote, or chlorite-altered basalt

Likely slate or fine-grained metamorphic rock

Slate; predominantly microscopic mica, quartz, and clay-derived minerals

Fine-grained dark metamorphic rock, likely slate or phyllite

Slate/phyllite; chiefly quartz, mica, and chlorite

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)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)