Metamorphic Or Igneous Alteration

Unakite

Altered Granite (Epidotized Granite)

Serpentine

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

Tumbled bronzite-rich metamorphic rock

Likely bronzite-bearing serpentinite or norite; exact identification requires testing

Unakite (likely)

Epidote–orthoclase–quartz rock; composition approximately epidote Ca₂(Al,Fe³⁺)₃(SiO₄)₃(OH) plus K-feldspar and quartz

Banded serpentine (likely antigorite-rich serpentinite)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnesite/talc

Polished pink-and-gray stone, likely rhodonite-bearing rock

Rhodonite (MnSiO₃) in a manganese-rich metamorphic matrix; exact identification requires testing

Polished mixed rock, likely orbicular/epidote-bearing granite or basalt

Uncertain; probable quartz–feldspar–amphibole/epidote aggregate

Unakite pebble (probable)

Unakite: epidote + pink potassium feldspar + quartz

Thulite in Matrix

Pink Zoisite - Ca2Al3(SiO4)3(OH)

Magnetite (Lodestone variety)

Magnetite (Fe3O4)

Pyrite-bearing schist (likely gold-colored mica, not native gold)

Muscovite–quartz schist with pyrite; muscovite KAl₂(AlSi₃O₁₀)(OH)₂, pyrite FeS₂

Epidote–garnet skarn (probable copper-bearing alteration rock)

Calc-silicate skarn; likely epidote, garnet, chlorite, quartz/calcite, and iron oxides/sulfides

Weathered basalt cobble

Basalt, a fine-grained mafic volcanic rock

Weathered gray pebble

Likely fine-grained basalt or andesite; exact identification requires testing

Jade

There are two distinct minerals classified as Jade: Jadeite (Na(Al,Fe3+)Si2O6) and Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2). Based on the image showing translucent, somewhat fibrous material, it is likely Nephrite.

Tumbled dark green stone, likely serpentine or nephrite jade

Serpentine-group minerals, chiefly antigorite/lizardite; possibly nephrite, an aggregate of tremolite–actinolite

Rhodonite

Rhodonite, manganese inosilicate — MnSiO₃; the specimen may include quartz, feldspar, and black manganese-oxide minerals in the matrix

Unakite (or Polished Jasper Pebble)

Altered Granite (Epidote-Orthoclase Rock)

Unakite Mushroom Carving

Altered Granite (composed of orthoclase feldspar, green epidote, and quartz)

Polished Unakite (likely)

Unakite: quartz + epidote + pink K-feldspar, commonly with minor chlorite

Unakite

Altered Granite (Epidotized Granite)

Serpentinite

Serpentinite (Mg3Si2O5(OH)4)

Unakite

Unakite (metasomatized granite)

Serpentine

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

Serpentinite

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

Serpentinite

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

Polished tiger’s-eye

Quartz variety with fibrous crocidolite pseudomorphs; mainly SiO₂

Noble Serpentine

Antigorite (Mg3Si2O5(OH)4)

Likely weathered feldspar-rich stone

Feldspar, probably microcline or orthoclase (KAlSi₃O₈), possibly altered pegmatite material

Quartz-rich rock, possibly milky quartz with chlorite or epidote

Quartz (SiO₂), with unidentified green inclusions

Tumbled blue-green stone, likely aventurine or serpentine

Quartz-rich aventurine (SiO₂) or serpentine-group mineral; exact identification requires testing

Tiger's Eye

Quartz pseudomorph after Crocidolite (SiO2 with Fe oxide inclusions)

Rhodonite

Manganese Inosilicate (MnSiO3), often with Ca, Fe, Mg, Zn

Weathered greenstone / altered rock fragment

Probable chlorite–epidote–actinolite-rich metavolcanic rock; exact identification requires testing

Greenstone (likely altered basalt or serpentinite)

Chlorite–epidote amphibolite/greenschist or serpentinite; exact identification requires testing

Greenstone / altered basalt (probable)

Chlorite–epidote–actinolite aggregate; commonly metabasalt (greenstone)

Likely serpentinite

Serpentinite, composed mainly of serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and minor chromite

Serpentinite (probable)

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and relict olivine/pyroxene

Epidote-rich rock (likely epidotite or altered basalt)

Epidote, Ca₂(Al,Fe³⁺)₃(SiO₄)₃(OH); possibly epidote-bearing mafic rock

Unakite (likely)

Epidote–K-feldspar–quartz aggregate; epidote: Ca₂(Al,Fe³⁺)₃Si₃O₁₂(OH)

Unakite

Epidote–K-feldspar–quartz granitoid (often called unakite)

Nephrite Jade

Ca2(Mg, Fe)5Si8O22(OH)2 (Magnesium-rich Tremolite-Actinolite)