Metamorphic (Low Grade)

Greenstone

Metamorphic Greenstone (Greenschist facies)

Tumbled yellow-green stone, likely serpentine or nephrite jade

Serpentine-group mineral, commonly antigorite/lizardite; possible nephrite, a tremolite–actinolite amphibole aggregate

Likely chlorite schist

Chlorite-rich schist; chiefly chlorite with possible quartz and mica

Greenstone (likely chlorite-rich metamorphic rock)

Chlorite-bearing greenschist; exact identification requires testing

Epidotite

Epidotite (Epidote content > 50%)

Siltstone / Slate

Siltstone / Low-grade Slate

Likely chlorite schist

Chlorite-rich schist; commonly composed of chlorite, quartz, and mica

Quartzite with Epidote

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

Ruby (Corundum)

Corundum (Aluminum Oxide with Chromium), Al2O3:Cr

Tumbled greenstone pebble

Greenstone (metamorphosed mafic volcanic rock; commonly chlorite, actinolite, epidote, and albite)

Likely greenstone (metamorphosed mafic rock)

Greenstone; commonly metamorphosed basalt or dolerite, with chlorite, actinolite, epidote, and albite

Garnet Schist

Almandine Garnet in Micaceous Schist

Jadeite Jade

NaAlSi2O6 (Sodium Aluminum Silicate)

Serpentinite

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

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)

Jadeite (Jade)

Jadeite, NaAlSi₂O₆

Slate / Greenschist

Foliated Metamorphic Rock (Greenschist/Slate)

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

Greenstone

Metamorphic mafic rock (greenschist facies)

Epidote in Quartz

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

Greenstone (likely altered basalt)

Metamorphosed mafic volcanic rock, commonly chlorite- and actinolite-rich; exact identification requires testing

Dark gray slate (possibly argillite or shale)

Slate, a low-grade metamorphic rock derived mainly from shale; composition commonly quartz, illite/muscovite, chlorite, and clay minerals

Epidotite (Unakite-related)

Epidote-rich 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

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Tumbled quartz pebble

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

Purple-gray shale or slate fragment

Argillite/slate, chiefly compacted clay minerals with quartz and mica

Small polished green stone, possibly serpentine or greenstone

Likely serpentine-rich rock; exact identification is limited by the blurred image

Schist

Mica Schist

Greenstone (likely actinolite-bearing metamorphic rock)

Actinolite-rich greenschist; exact identification requires testing

Greenstone (likely chlorite- or epidote-altered basalt)

Metamorphosed mafic volcanic rock; commonly chlorite–epidote–actinolite assemblage

Weathered greenstone (possible serpentinite)

Greenstone, a broad term for metamorphosed mafic rock; exact identification is uncertain from the photograph

Greenstone (altered volcanic rock)

Chlorite–epidote–actinolite-bearing metabasalt (tentative identification)

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

Blue-gray metamorphic rock, likely slate or schist

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

Fine-grained dark metamorphic rock, likely slate or phyllite

Slate/phyllite; chiefly quartz, mica, and chlorite