Metamorphic Or Igneous Alteration

Tumbled green serpentine (probable)

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

Polished black stone carving, likely soapstone/steatite

Steatite (massive talc), Mg₃Si₄O₁₀(OH)₂; exact material cannot be confirmed from the image

Serpentinite (with Pyrite/Garnet inclusions)

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3Si2O5(OH)4

Serpentine

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

Green jade-like cabochon pendant

Possibly nephrite (fine-grained tremolite–actinolite); the photo alone cannot confirm the material

Polished tiger’s-eye cabochon

Chatoyant quartz (SiO₂), typically quartz pseudomorphically replacing crocidolite fibers

Mixed mineral and gemstone specimens

Likely amethyst (quartz), malachite, blue calcite or dyed chalcedony, red jasper, and green aventurine/serpentine

Tiger’s-eye

Quartz variety, SiO₂, with fibrous crocidolite pseudomorphed by quartz

Tumbled serpentine (likely nephrite-like greenstone)

Serpentine-group minerals, chiefly antigorite/lizardite; exact identification requires testing

Epidote

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

Tumbled yellow-green stone, likely serpentine

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

Possible serpentine or greenstone pebble

Serpentine-group minerals, chiefly antigorite/lizardite; exact identification requires testing

Weathered quartz-rich rock, possibly quartzite or silicified sandstone

Quartzite (mostly SiO₂), with possible iron-oxide staining and minor feldspar/mica

Greenstone (likely serpentinite or altered basalt)

Serpentinite, chiefly serpentine-group minerals; possibly chlorite- or actinolite-bearing greenschist

Quartz-bearing metamorphic rock (likely quartz vein in schist or altered granite)

Quartz (SiO₂) in a mica-rich host rock; exact identification requires testing

Likely serpentine or greenstone pebble

Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄; possibly chlorite-rich greenstone

Unakite (likely)

Epidote–K-feldspar–quartz metamorphic rock

Serpentine (Nephrite-like Serpentine)

Serpentinite (Hydrous magnesium iron phyllosilicate)

Unakite

Altered Granite (Epidote-bearing Granitic Rock)

Unakite

Altered Granite

Serpentinite

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

Unakite

Unakite (altered granite)

Weathered granitic rock (likely granite or granodiorite)

Granite–granodiorite; chiefly quartz, feldspar, and mica/amphibole

Propylitic Altered Andesite

Hydrothermally Altered Andesite

Small brown rock fragment

Undetermined; possibly weathered iron-stained quartzite or chert

Amazonite

KAlSi3O8 (Potassium Aluminum Silicate)

Seraphinite

Clinochlore (Mg,Fe2+)5Al(Si3Al)O10(OH)8

Tumbled greenstone-like pebble

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

Tumbled dark stone, likely labradorite or serpentine

Likely labradorite (plagioclase feldspar; approximately NaAlSi₃O₈–CaAl₂Si₂O₈) or serpentine-group mineral

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

Greenstone / altered basalt (probable)

Chlorite–epidote–actinolite-rich metabasalt; exact identification requires testing

Tumbled greenstone, likely serpentine or altered basalt

Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄; possibly chlorite/epidote-bearing mafic rock

Banded Chert or Unakite-like Rock

Epidotized Granulite or Jasperoid Chert

Unakit

Epidotized Granite

Quartzite with Chlorite / Epidote Inclusion

Metamorphic Quartzite (SiO2 with chlorite/epidote inclusions)

Unakite

Unakite; epidote–pink feldspar–quartz rock

Serpentine

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

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite)

Unakite

Unakite (Epidotized Granite)

Unakite

Epidotized Granite

Serpentine (Lizardite)

Serpentine subgroup, Mg3Si2O5(OH)4

Unakite

Unakite (Epidotized Granite)