Metamorphic Or Igneous Alteration

Serpentine (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

Unakite

Epidotized Granite

Gneiss with Iron Staining and Sulfide Mineralization

Metamorphic Gneiss / Amphibolite with Iron/Sulfide Oxidation

Weathered iron-rich rock, possibly limonite-bearing breccia or altered basalt

Indeterminate; likely Fe-oxide/hydroxide–stained silicate rock, dominated by limonite/goethite with possible quartz or feldspar

Weathered greenish rock pebble

Possibly altered basalt or greenstone; exact identification is uncertain from the photograph

Vesicular basalt (scoriaceous basalt)

Basalt; predominantly plagioclase, clinopyroxene, and olivine with iron oxides

Rounded river pebble, likely basaltic or andesitic rock

Fine-grained mafic to intermediate volcanic rock; exact identification requires testing

Weathered volcanic rock, likely andesite

Andesite (plagioclase–pyroxene volcanic rock), identification tentative

Weathered quartz-rich stone, likely milky quartz

Quartz (SiO₂), possibly a quartz-rich metamorphic or igneous fragment

Tumbled greenish stone, possibly serpentine or aventurine

Uncertain; likely serpentine-group mineral or quartz-rich green aventurine

Tumbled tiger’s-eye

Tiger’s-eye quartz, SiO₂ with fibrous crocidolite pseudomorphs

Polished Tiger’s Eye

Tiger’s eye quartz; SiO₂ with parallel crocidolite-derived inclusions

Hematite (Specularite)

Fe2O3 (Iron(III) oxide)

Green jade bangle

Jadeite or nephrite (jade); exact species cannot be confirmed visually

Tumbled serpentine-rich stone

Serpentinite, likely with yellow limonite/goethite or epidote alteration

Greenstone pebble, likely serpentine or altered basalt

Probably serpentinite (serpentine-group minerals, Mg₃Si₂O₅(OH)₄) or chlorite-rich greenschist

Serpentine-rich rock (likely serpentinite)

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

Weathered quartz-rich rock, likely quartzite

Quartzite; predominantly crystalline SiO₂ with minor iron-oxide staining

Rounded greenstone pebble

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

Basalt with Epidote (Porphyritic Basalt)

Mafic Porphyritic Basalt with (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)) inclusions

Unakite

Epidote–orthoclase–quartz metamorphic rock

Hematite

Iron(III) oxide (Fe2O3)

Jade

There are two distinct minerals commonly known as Jade: Jadeite (NaAlSi2O6) and Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2). Based on the appearance, these spheres are likely Nephrite.

Polished feldspar-rich granite

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

Quartz-bearing pegmatitic rock, likely quartz–feldspar–mica specimen

Granitic pegmatite; primarily quartz (SiO₂), feldspar, and mica, with possible iron-oxide staining

Likely polished rhyolite or porphyritic volcanic rock

Rhyolite, possibly flow-banded or altered rhyolite; composition mainly quartz and alkali feldspar with minor biotite/iron oxides

Weathered basalt pebble

Basalt, a fine-grained mafic volcanic rock; likely containing plagioclase and pyroxene with weathering products

Pebble with vesicles, likely basalt

Vesicular basalt; chiefly plagioclase, pyroxene, and iron-magnesium minerals

Weathered iron-rich rock, possibly laterite or altered basalt

Probable ferruginous basalt/lat eritic material; exact identification requires testing

Granite (likely weathered biotite granite)

Coarse-grained felsic plutonic rock; quartz + alkali feldspar/plagioclase + biotite/hornblende

Unakite (likely)

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

Polished tiger’s-eye

Quartz-rich tiger’s-eye; mainly SiO₂ with iron oxides and fibrous pseudomorphs after crocidolite

Tumbled serpentine

Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; approximately Mg₃Si₂O₅(OH)₄

Rounded greenstone pebble

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

Unakite (likely)

Epidote–pink feldspar–quartz aggregate; commonly classified as altered granite

Polished serpentine pebble

Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, or chrysotile)

Serpentine (possibly New Jade)

Serpentine group, Mg3Si2O5(OH)4

Polished orbicular jasper (likely kambaba jasper)

Silicified microcrystalline quartz/chalcedony, commonly with chlorite- or amphibole-rich orbicules; composition varies

Tumbled serpentine

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile)

Greenstone / serpentine-rich metamorphic rock

Likely serpentinite, composed mainly of serpentine-group minerals (antigorite, lizardite, or chrysotile), with possible magnetite and chlorite

Serpentine (likely serpentine-rich pebble)

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