Metamorphic Or Igneous Alteration

Tiger’s-eye

Chatoyant quartz (SiO₂), commonly pseudomorphic quartz after crocidolite

Quartz-veined altered rock

Likely quartz-bearing metasediment or altered igneous rock; vein mineral: quartz (SiO₂)

Weathered sulfide-bearing rock, likely pyrite-rich schist or quartzite

Quartz–mica rock with disseminated pyrite (FeS₂), possibly altered schist

Polished dark green stone pendant, likely serpentine or nephrite jade

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

Tumbled serpentine (likely)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄

Banded Serpentinite (Beach Pebble)

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

Engraved green stone worry pebble

Likely nephrite jade (tremolite–actinolite series); identification is uncertain from the image

Tumbled serpentine or chlorite-rich pebble

Serpentine-group minerals, chiefly antigorite/lizardite; possibly chlorite or greenstone

Serpentine

Antigorite, Lizardite, and Chrysotile (Mg3Si2O5(OH)4)

Serpentine

Antigorite/Lizardite/Chrysotile group, Mg3Si2O5(OH)4

Unakite

Epidotized Granite

Unakite (Epidote in Feldspar/Quartz)

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

Unakite

Altered Granite (Epidotized Granite)

Serpentine

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

Serpentinite

Serpentinite ((Mg, Fe, Ni)3Si2O5(OH)4)

Stichtite in Serpentine (Atlantasite)

Mg6Cr2CO3(OH)16·4H2O in Mg3Si2O5(OH)4

Tumbled green stone, likely serpentine

Serpentine-group minerals, commonly antigorite or lizardite; approximate composition Mg₃Si₂O₅(OH)₄

Greenstone (likely serpentinite or altered basalt)

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

Likely greenish serpentine or soapstone fragment

Serpentine-group minerals, commonly antigorite/lizardite; possibly talc-rich steatite

Polished serpentine-rich stone (likely serpentine jade/“new jade”)

Serpentinite; chiefly serpentine-group minerals, commonly antigorite, lizardite, or chrysotile, with possible magnetite and carbonate

Quartz with Epidote / Serpentine (Vein Quartz)

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

Yellow Jade

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

Epidote in Quartz

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

River Cobble (likely Basalt or Greenstone)

Mafic Igneous Rock (with possible chloritic alteration)

Serpentine

Antigorite, Lizardite, or Chrysotile; formula generally (Mg,Fe)3Si2O5(OH)4

Serpentine

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

Quartz (in a rock matrix)

Quartz (SiO2)

Likely green serpentine or chlorite-rich rock

Serpentine-group minerals, commonly lizardite/magnesite-bearing serpentinite; exact identification requires testing

Polished serpentine breccia

Serpentinite, commonly serpentine-group minerals with carbonate and magnetite

Charoite

Charoite; (K,Sr,Ba,Ca)15-16(Na,Ca)8(Si,Al)24O60(OH,F)4·nH2O

Epidote (likely Pistacite in Epidosite rock)

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

Nephrite Jade

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

Rounded greenstone cobble

Likely greenschist or altered basalt; composition commonly chlorite, epidote, actinolite, albite, and quartz

Greenstone (likely serpentinite or altered basalt)

Serpentinite, predominantly serpentine-group minerals (Mg₃Si₂O₅(OH)₄); possibly chlorite- or actinolite-rich greenschist

Serpentinite (serpentinized ultramafic rock)

Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with magnetite, brucite, and residual olivine/pyroxene

Serpentine (serpentinite)

Serpentine-group minerals, chiefly antigorite, lizardite, and chrysotile: Mg₃Si₂O₅(OH)₄

Quartzite with Mica

Metamorphic Quartzite (SiO2 + Mica phyllosilicates)

Unakite

Altered Granite (Granitic Metamorphic Rock)

Unakite

Altered Granite (Granitic Metamorphic Rock)

Green Apophyllite and Stilbite on Quartz Cluster

Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)

Polished green stone, possibly serpentine or nephrite jade

Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄; alternatively nephrite, a tremolite–actinolite aggregate

Tumbled greenstone (likely serpentine or nephrite)

Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄; possibly nephrite, a fibrous amphibole aggregate