Metamorphic Or Igneous Alteration

Unakite

Epidote with orthoclase feldspar and quartz

Milky quartz (iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Green Fuchsite and Quartz

K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)

Nephrite Jade

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

Epidosite

Epidosite (composed mainly of Epidote - {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

Nephrite Jade

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

Nephrite Jade

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

Tumbled green stone, likely serpentine or nephrite jade

Serpentine-group minerals, commonly antigorite/lizardite; possible nephrite, a jade variety of tremolite–actinolite

Black Star Diopside

Diopside (CaMgSi2O6) with Magnetite inclusions

Epidote

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

Tumbled pale-green mineral specimen, likely aventurine or serpentine

Quartzite with fuchsite (aventurine) or serpentine-group mineral; exact identification requires testing

Tumbled green serpentine (probable)

Serpentine-group minerals, chiefly antigorite and lizardite; hydrated magnesium silicate, approximately Mg₃Si₂O₅(OH)₄

Dyed Magnesite (Howlite imitation)

Magnesium carbonate (MgCO3) with dye

Serpentine

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Unakite

Unakite (Epidotized Granite)

Dalmatian Jasper

Microgranular quartz with amphibole/tourmaline inclusions

Dark green cabochon, likely serpentine or nephrite jade

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

Stichtite in Serpentinite (Atlantisite)

Mg6Cr2CO16(OH)16·4H2O in Mg3Si2O5(OH)4

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

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)

Quartz-bearing metamorphic rock, possibly epidote/quartzite

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

Pink Thulite

Thulite (Ca2Al3(SiO4)3(OH)) - Pink Zoisite

Unakite

Altered Granite (Epidotized Granite)

Serpentine

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

Serpentine

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

Greenstone pebble, likely serpentine or epidote-bearing rock

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

Nephrite Jade Elephant Carving

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

Fuchsite in Quartz (Aventurine Quartz)

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

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)

Pyrite on Quartz (Fool's Gold in Quartz)

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Metasedimentary or Igneous Matrix

Quartzite with Epidote

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

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

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)