Metamorphic Or Igneous Alteration

Polished magnetite-rich ironstone (probable magnetite/hematite nodule)

Magnetite, Fe₃O₄, possibly mixed with hematite, Fe₂O₃, and iron-bearing gangue

Tumbled tiger’s-eye

Quartz variety, fibrous golden-brown quartz (SiO₂), commonly pseudomorphic after crocidolite

Polished dark stone, likely nephrite jade or serpentine

Tentatively nephrite (fibrous amphibole aggregate, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂); possibly serpentine

Likely tumbled green mineral (possibly serpentine or aventurine)

Indeterminate; possibilities include serpentine-group minerals, nephrite, or green aventurine quartz

Small brown rock fragment; exact identification uncertain

Unidentified fine-grained lithic fragment

Dark basalt or vesicular volcanic rock

Basalt; predominantly plagioclase, pyroxene, and commonly olivine, with possible iron-oxide alteration

Serpentine (likely antigorite-rich serpentinite)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with dark magnetite/chromite or pyroxene inclusions

Unakite

Altered granite (Epidotized granite)

Unakite

Altered Granite (Epidote, Pink Orthoclase Feldspar, and Quartz)

Unakite

Unakite (Epidotized Granite)

Serpentine

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

Serpentine

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

Greenstone / Basalt

Aphanitic Mafic Igneous Rock (Metabasalt)

Likely polished greenstone or serpentine inlay

Serpentine-group mineral, commonly antigorite/lizardite; possibly nephrite jade

Blue calcite-rich marble or limestone

Calcite (CaCO₃), likely recrystallized as marble; possibly aragonite-bearing limestone

Tumbled dark green stone, likely serpentine or nephrite jade

Serpentine-group minerals, commonly antigorite/lizardite; possibly nephrite (interlocking tremolite-actinolite)

Likely tumbled epidote-bearing rock or green jasper

Epidote-group silicate, possibly in a jasper or serpentinite matrix

Tumbled green stone, likely serpentine or green aventurine

Uncertain; possible serpentine-group mineral (Mg₃Si₂O₅(OH)₄) or quartz-rich aventurine

Black tourmaline (schorl)

Schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Rhodonite

Manganese inosilicate, (Mn,Fe,Mg,Ca)SiO3

Pale blue-gray quartz-rich pebble (tentative)

Quartz, SiO₂, possibly chalcedony or a weathered metamorphic fragment

Serpentinite (Polished Serpentine)

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

Serpentinite (likely veined variety)

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and carbonate veins

Polished pink quartzite (likely with chlorite inclusions)

Quartzite; predominantly quartz (SiO₂), with minor chlorite or amphibole inclusions

Tumbled greenstone pebble

Likely serpentinite or greenstone; exact identification requires testing

Moss Agate

Silicon Dioxide (Chalcedony variety) with green hornblende or chlorite inclusions - SiO2

Rock Fragment with Calcite/Quartz Vein

Polymictic Rock Fragment (SiO2 / CaCO3)

Unakite

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

Tumbled greenstone (likely serpentine or nephrite jade)

Serpentine-group mineral, commonly antigorite [(Mg,Fe)₃Si₂O₅(OH)₄], or nephrite jade (interlocking tremolite–actinolite amphibole)

Green serpentine or nephrite-like stone

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

Greenstone (likely altered basalt or metabasalt)

Chlorite–actinolite-rich metabasalt; composition commonly dominated by chlorite, actinolite, epidote, albite, and quartz

Serpentine (likely serpentinite)

Serpentine-group minerals, chiefly antigorite/lizardite, commonly with magnetite and chlorite

Green serpentine or nephrite-like stone

Serpentine-group minerals, chiefly antigorite/lizardite; possibly nephrite jade (actinolite)

Polished pink-and-green feldspar-bearing rock, likely unakite or aventurine granite

Unakite-like epidote–feldspar–quartz aggregate; composition commonly K-feldspar + quartz + epidote

Fuchsite-bearing Quartzite (Green Quartzite)

Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2) in Quartzite

Weathered quartz-rich rock, possibly pegmatite

Likely quartz–feldspar pegmatite; exact identification is uncertain from the image

Quartz-rich pegmatitic rock, possibly altered granite

Quartz–feldspar pegmatite; probable composition of quartz (SiO₂), feldspar, and mica/secondary alteration minerals

Tumbled magnetite (likely)

Magnetite, Fe₃O₄; possibly magnetite-rich ironstone

Basalt with Epidote Veins

Mafic Igneous Rock (Basalt)

Raw greenish mica-rich mineral specimen

Likely muscovite mica with quartz or feldspar inclusions; exact identification requires testing

Serpentine

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

Unakite (Epidote with Quartz and Feldspar)

Unakite (Metasomatized Granitic Rock)