Metamorphic (Altered Igneous Rock)

Tumbled greenstone, likely serpentine or altered basalt

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

Greenstone / altered mafic rock

Likely chlorite–actinolite metabasalt (greenschist); exact identification requires testing

Lapis Lazuli

Lazurite-dominant Metamorphic Rock (complex aluminosilicate)

Polished serpentine (likely)

Serpentine-group minerals, chiefly antigorite/lizardite; commonly associated with magnetite and chromite

Phyllite (possibly low-grade greenish slate)

Foliated metamorphic rock composed mainly of very fine-grained quartz, mica, and chlorite; approximate composition varies and has no single fixed chemical formula

Lapis Lazuli

Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Serpentine-rich altered ultramafic rock

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

Unakite

Altered Granite (Plagioclase-Epidote-Quartz Rock)

Unakite (likely)

Epidote–feldspar–quartz rock; unakite is altered granitic rock, commonly containing epidote, pink orthoclase, and quartz.

Epidote

Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Likely foliated metamorphic rock (schist or phyllite)

Undetermined from the image; possibly mica-rich schist or phyllite

Rounded weathered pebble, likely basaltic or metamorphic

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

Likely basalt or mafic metamorphic rock

Fine-grained basalt, possibly altered; chiefly plagioclase feldspar and pyroxene, with minor iron-titanium oxides

Polished tiger iron

Tiger iron: banded quartz–crocidolite/jasper–hematite rock

Unakite (likely)

Epidote–feldspar–quartz rock, commonly called unakite; composition is uncertain from the photo.

Banded gneiss

Quartz–feldspar gneiss, with dark biotite or amphibole

Serpentinite (probable)

Serpentinite, a rock composed chiefly of serpentine-group minerals such as antigorite, lizardite, or chrysotile

Serpentine

Antigorite, Lizardite, or Chrysotile; (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Milky quartz in weathered host rock

Quartz, silicon dioxide (SiO₂), likely with iron-stained feldspar or altered matrix

Serpentinite (serpentinized ultramafic rock)

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

Weathered rounded pebble

Likely altered granite or granitic gneiss fragment; exact identification is uncertain from the image

Tumbled granite

Granite, chiefly quartz, feldspar, and mica

Lapis Lazuli

Complex rock primarily containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Rough Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Quartz-rich conglomeratic rock (likely granitic breccia or conglomerate)

Uncertain; quartz–feldspar rock in a fine-grained matrix, possibly weathered granite or polymictic conglomerate

Greenstone / altered mafic rock

Likely serpentinite or chlorite-rich metabasalt; exact identification requires testing

Tumbled leopard-skin jasper (probable)

Orbicular rhyolite/jasper; primarily microcrystalline quartz (SiO₂) with feldspar and iron-oxide inclusions

Lapis Lazuli (polished cabochon)

Lazurite-rich metamorphic rock (approx. Na6Ca2Al6Si6O24(SO4,S,Cl)2)

Quartz (Milky or Smoky variant)

Silicon Dioxide (SiO2)

Likely iron-rich metamorphic rock (possibly hematite-rich ironstone)

Uncertain from the image; possible hematite-bearing ironstone, chiefly Fe₂O₃ with associated silicate minerals

Greenstone (likely metamorphosed basalt)

Metabasalt/greenstone; commonly composed of chlorite, actinolite, epidote, albite, and quartz

Tumbled serpentine

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

Lapis Lazuli

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Unakite (likely)

Epidote–pink feldspar–quartz rock; commonly termed unakite

Greenstone, likely chlorite-rich schist

Chlorite schist; chiefly chlorite, actinolite/amphibole, feldspar, and quartz

Pink Granite / Gneiss Pebble

Quartz-Feldspar Granitic Rock

Weathered iron-rich rock, possibly basalt or limonite-bearing sandstone

Undetermined; likely Fe-oxide-stained basalt or ferruginous sandstone (hematite/goethite-bearing)

Hornblende-bearing metamorphic rock (likely amphibolite)

Amphibolite, chiefly hornblende amphibole and plagioclase feldspar

Weathered granite or granitic gneiss

Granite; primarily quartz (SiO₂), feldspar, and mica

Polished tiger’s-eye cabochon

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

Unakite

Altered Granite (Epidote-bearing Granitic Rock)

Unakite

Epidote–pink feldspar–quartz rock