Metamorphic Or Igneous Alteration

Tiger's Eye

Quartz (chalcedony) with crocidolite inclusions, SiO2

New Jade (Serpentine)

Antigorite / Serpentine Group (Mg3Si2O5(OH)4)

Chakra Stone Bracelet (mixed gemstones)

Multi-mineral/Gemstone assembly (primarily Quartz variety beads)

Dark green cabochon, likely serpentine or nephrite jade

Serpentine-group minerals, commonly antigorite/lizardite; possible nephrite (microcrystalline tremolite-actinolite)

Tiger’s eye

Quartz (SiO₂), fibrous pseudomorph after crocidolite

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Unakite

Unakite (Epidotized Granite)

Rounded weathered pebble, likely basaltic or metamorphic

Indeterminate fine-grained mafic rock; possibly basalt or altered basalt

Polished dark-green stone, possibly serpentine or nephrite jade

Serpentine-group minerals, commonly antigorite/lizardite; possible nephrite (actinolite–tremolite amphibole)

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Serpentine Jade (New Jade/Olive Jade)

Serpentinite (a rock composed primarily of serpentine minerals) / Mg3Si2O5(OH)4 for Antigorite and Lizardite

White Jade (Nephrite)

Nephrite, Ca2(Mg,Fe)5Si8O22(OH)2

Tumbled green stone, possibly serpentine or nephrite jade

Tentative: serpentine-group mineral (Mg₃Si₂O₅(OH)₄) or nephrite, a fibrous amphibole aggregate

Polished greenstone (likely serpentine or nephrite jade)

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

Serpentinite (likely serpentinized ultramafic rock)

Serpentinite; predominantly serpentine-group minerals (Mg3Si2O5(OH)4), commonly with magnetite, brucite, and relict olivine/pyroxene

Tumbled greenstone (likely serpentine or nephrite jade)

Serpentine-group minerals, commonly antigorite; possibly nephrite, a fibrous aggregate of amphibole (actinolite–tremolite)

Nephrite Jade Elephant Carving

Nephrite (a variety of the calcium, magnesium, and iron-rich amphibole minerals tremolite or actinolite)

Greenstone pebble, likely serpentine or epidote-bearing rock

Probable serpentinite (serpentine-group minerals: Mg₃Si₂O₅(OH)₄), possibly epidote-rich metamorphic rock

Fuchsite in Quartz (Aventurine Quartz)

K(Al,Cr)2(AlSi3O10)(OH)2 (Fuchsite) + SiO2 (Quartz)

Serpentine

Antigorite/Lizardite (Mg,Fe)3Si2O5(OH)4

Unakite

Altered Granite (Epidotized Granite)

Serpentine

Antigorite/Chrysotile/Lizardite mix - Mg3Si2O5(OH)4

Soapstone (Talc-Schist)

Steatite (composed primarily of Talc: Mg3Si4O10(OH)2)

Weathered greenstone (metamorphosed mafic rock)

Chlorite- and epidote-bearing metabasalt; exact identification requires examination

Polished green-and-white stone, possibly serpentine or jade

Tentatively serpentine (Mg₃Si₂O₅(OH)₄) or nephrite jade (interlocking amphibole fibers)

Tumbled green stone, likely serpentine or aventurine

Serpentine-group mineral (Mg₃Si₂O₅(OH)₄) or quartz-rich aventurine; exact identification requires testing

Blue sodalite bead necklace

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

Epidote and Quartz in Basalt Porpohyry

Epidote bearing Porphyritic Basalt with Quartz Veins

Granite with Epidote / Unakite precursor

Plutonic igneous rock composed of Quartz, Feldspar, and Epidote/Chlorite

Kaolinite (Chalky Clay)

Kaolinite (Al2Si2O5(OH)4)

Quartzite with Epidote

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

Quartz-bearing metamorphic rock, possibly epidote/quartzite

Quartz-rich rock with possible epidote and feldspar; exact identification requires testing

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

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2

Polished green stone, likely nephrite jade

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

Tumbled serpentine

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

Weathered sulfide-bearing metamorphic rock (likely pyrite- or chalcopyrite-rich schist)

Quartz–mica schist with iron sulfides; possible pyrite (FeS₂) and chalcopyrite (CuFeS₂)

Tumbled tiger’s-eye

Quartz (SiO₂), fibrous golden-brown variety with crocidolite pseudomorphs

Likely tumbled serpentine or greenstone pebble

Serpentine-group minerals, chiefly antigorite/lizardite; identification is uncertain from the photo

Unakite

Altered Granite (Epidote, Orthoclase Feldspar, Quartz)

Unakite

Unakite (Altered Granite composed of Orthoclase KAlSi3O8, Epidote Ca2(Al, Fe)3(SiO4)3(OH), and Quartz SiO2)

Unakite

Unakite (Altered Granite consisting of Orthoclase KAlSi3O8, Epidote Ca2(Al,Fe)3(SiO4)3(OH), and Quartz SiO2)