Metamorphic Or Igneous Alteration

Weathered vesicular volcanic rock

Likely basaltic andesite or scoriaceous basalt; exact identification requires fresh surface and testing

Tumbled orange-brown feldspathic rock, likely granite or weathered syenite

Feldspar-rich granitoid; chiefly K-feldspar and plagioclase with minor quartz and dark biotite/amphibole

Polished green jade (likely nephrite)

Nephrite jade, an interlocking amphibole aggregate dominated by tremolite–actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂

Quartz vein in greenstone/altered mafic rock

Quartz (SiO₂) with chlorite–epidote-rich metabasalt or greenstone

Serpentinite (serpentine-rich rock)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, chlorite, and talc

Serpentine (likely serpentinite)

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

Tumbled greenstone, likely nephrite jade

Nephrite jade (interlocking tremolite–actinolite amphibole; Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂)

Polished blue-green stone, likely serpentine or chrysocolla-bearing rock

Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄; exact identification requires testing

Yellow serpentine beads (likely processed serpentine)

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

Likely weathered basalt with iron-oxide alteration

Basalt (fine-grained mafic volcanic rock), chiefly plagioclase and pyroxene with altered iron-bearing minerals

Serpentinite

Serpentinite (composed primarily of minerals in the serpentine group: (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Weathered, rounded rock (likely metamorphic or igneous)

Undetermined; possibly a quartz- and feldspar-bearing rock

Greenstone (probable altered basalt)

Chlorite–epidote–actinolite-rich greenschist; composition commonly derived from basalt

Tumbled Tiger’s Eye

Quartz variety, fibrous SiO₂ with crocidolite pseudomorphs

Tumbled serpentine (likely green calcite or aventurine alternative)

Serpentine-group minerals, commonly antigorite/lizardite; approximate formula Mg₃Si₂O₅(OH)₄

Tumbled quartz-rich stone, likely iron-stained quartzite

Quartzite, predominantly SiO₂, with iron-oxide staining and possible mica/minor feldspar

Polished greenstone pebble (likely epidote-bearing stone)

Epidote–chlorite amphibolite or altered basalt; composition likely epidote, chlorite, amphibole/pyroxene, and iron oxides

Greenstone (likely serpentinite or chlorite-rich metamorphic rock)

Probable serpentinite/chlorite schist; commonly dominated by serpentine-group minerals, chlorite, talc, and magnetite

Waterworn greenstone pebble

Likely serpentinite or chlorite-rich metamorphic rock; exact identification requires testing

Polished nephrite jade

Nephrite jade; compact amphibole aggregate, chiefly tremolite–actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂

White jade (likely nephrite) beads

Nephrite jade, an interlocking amphibole aggregate dominated by tremolite–actinolite; exact identification requires testing

Polished black tourmaline (schorl), likely a carved or polished specimen

Schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Tiger’s-eye cabochon or polished fragment

Chatoyant quartz, chiefly quartz (SiO₂) with iron-oxide inclusions

Stone bead bracelet

Unidentified polished natural-stone beads; possibly wood-grain jasper, agate, or serpentine

Carved white jade pendant

Likely nephrite jade (actinolite–tremolite series); possibly jadeite or chalcedony

Likely polished green serpentine or aventurine

Serpentine-group minerals, commonly antigorite/lizardite; alternatively quartz-rich green aventurine

Leopard Skin Jasper

Silicon Dioxide (SiO2) with impurities

Serpentinite (likely antigorite-rich)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite and minor chromite

Epidote (Unakite-related)

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

Polished greenstone (likely serpentine or altered basalt)

Serpentinite, mainly serpentine-group minerals (Mg₃Si₂O₅(OH)₄); exact identification requires testing

Serpentinite (likely serpentinized ultramafic rock)

Serpentine-group minerals, chiefly lizardite, chrysotile, and/or antigorite; commonly derived from peridotite

Tumbled serpentine (likely)

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

Serpentine (likely antigorite-rich serpentinite)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, chromite, or talc

Serpentine-rich ultramafic rock

Serpentinite (predominantly serpentine-group minerals: lizardite, chrysotile, and/or antigorite)

Greenstone (likely serpentinite or greenstone pebble)

Serpentinite-rich ultramafic rock; commonly dominated by serpentine-group minerals, with possible chlorite, actinolite, or magnetite

Magnetite

Magnetite (Fe3O4)

Serpentine (likely serpentinite)

Serpentinite, composed mainly of serpentine-group minerals such as lizardite, antigorite, or chrysotile; exact identification cannot be confirmed from the image alone.

Dark veined metamorphic rock, likely serpentinite

Serpentinite; predominantly serpentine-group minerals, possibly with magnesite or calcite veins

Likely tiger’s-eye rough fragment

Tiger’s-eye (quartz, SiO₂, with fibrous crocidolite-derived inclusions)

Polished red tiger’s-eye (likely)

Quartz pseudomorph after crocidolite; chiefly SiO₂ with iron oxides

Polished dark-green stone, likely serpentinite

Serpentinite; predominantly serpentine-group minerals, commonly antigorite, lizardite, or chrysotile, with possible magnetite and minor pyroxene

Tumbled tiger’s eye

Quartz (SiO₂) with fibrous riebeckite/crocidolite inclusions