Metamorphic (Low Grade)

Reddish foliated metamorphic rock, likely phyllite

Phyllite, typically quartz–mica–chlorite with iron-oxide staining

Jadeite (Jade)

Jadeite; NaAlSi2O6

Serpentinite

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

Pyrite

Iron Sulfide (FeS2)

Red Jasper

Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)

Prase quartz with actinolite inclusions

Silicon dioxide (SiO2) with Calcium Magnesium Iron Silicate Hydroxide inclusions

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Pyrite-bearing metamorphic rock (likely greenschist or phyllite)

Quartz–chlorite–mica schist/phyllite with disseminated pyrite (FeS₂)

Quartz fragment

Quartz (silicon dioxide, SiO₂)

Greenstone, likely altered basalt (possibly serpentinite)

Metabasalt/greenschist; commonly chlorite–actinolite–epidote ± serpentine

Tumbled greenstone, likely serpentine or altered basalt

Probable serpentinite (Mg-rich phyllosilicates, chiefly antigorite/lizardite) or chlorite-rich basalt

Greenschist (Chlorite Schist)

Greenschist (Metamorphic rock dominated by chlorite, actinolite, and epidote)

Banded gneiss

Gneiss; typically quartz–feldspar–mica assemblage

Rounded greenstone cobble

Likely altered basalt/greenstone; commonly chlorite–actinolite–epidote rich

Fuchsite

Chromium-rich Muscovite (KAl2(AlSi3O10)(OH,F)2 with Cr replacements)

Quartz with Epidote

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate [Ca2(Al,Fe)3(SiO4)3(OH)]

Tumbled serpentine

Serpentine-group minerals, chiefly lizardite and antigorite; approximate formula Mg₃Si₂O₅(OH)₄

Polished tiger’s-eye

Quartz variety with fibrous crocidolite pseudomorphs; mainly SiO₂

Black shale or slate fragment

Carbonaceous shale; possibly low-grade slate (clay minerals, quartz, carbon/graphite)

Khondalite

Garnet-Sillimanite-Graphite Gneiss

Ruby (Corundum)

Aluminium oxide (Al2O3) with Chromium traces

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)

Jadeite (Jade)

Jadeite (NaAlSi2O6)

Jasper pebble

Silicon Dioxide (SiO2) with iron oxide impurities

Jadeite

Jadeite (NaAlSi2O6)

Likely raw epidote or altered amphibole crystal

Epidote, Ca₂(Al,Fe³⁺)₃(SiO₄)₃(OH); identification is tentative from the image

Greenstone

Greenschist / Greenstone (Epimetamorphic Rock)

Garnet-Bearing Gneiss

Garnetiferous Feldspathic Gneiss

Greenschist (Greenstone River Pebble)

Greenschist (Chlorite Schist)

Green schist (possibly chlorite schist)

Chlorite-rich schist; likely chlorite with quartz and mica, but exact identification cannot be confirmed from the image

Weathered greenstone (probable)

Chlorite–actinolite–epidote-rich metamorphosed mafic rock; exact identification requires testing

Greenstone (likely chlorite-rich schist)

Greenschist; commonly composed of chlorite, actinolite, epidote, and albite

Blue-gray metamorphic rock, likely slate or phyllite

Fine-grained foliated metapelite; commonly mica- and chlorite-rich

Greenstone (likely chlorite-rich greenschist)

Greenschist facies metamorphic rock, typically composed of chlorite, actinolite, and albite; exact identification requires testing

Polished black slate or schist slab

Slate/schist, composed mainly of fine-grained mica, quartz, and chlorite

Polished tiger’s-eye

Quartz variety: fibrous chatoyant quartz, chiefly SiO₂, pseudomorphous after crocidolite

Greenstone (likely altered basalt or metabasalt)

Chlorite–actinolite-rich metabasalt; composition commonly dominated by chlorite, actinolite, epidote, albite, and quartz

Hard Sandstone (Quartzite)

Quartz-rich Sedimentary Rock (Proto-Quartzite)

Greenstone, likely chlorite-rich schist

Chlorite schist; chiefly chlorite, actinolite/amphibole, feldspar, and quartz

Polished tiger’s-eye (likely blue-and-golden tiger’s-eye)

Fibrous quartz, SiO₂, pseudomorphic after crocidolite; varieties include golden tiger’s-eye and hawk’s-eye

Weathered greenstone (likely serpentinite or altered basalt)

Serpentinite-group rock, commonly dominated by serpentine minerals (antigorite/lizardite); exact identification requires testing

Crystalline limestone (marble-like calcite rock)

Calcite, CaCO₃; likely recrystallized limestone (marble)