Sedimentary Rock (Altered)

Dzi Bead (Agate)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Tiger’s-eye schist (likely golden amphibole-bearing schist)

Quartz–mica schist with fibrous amphibole, commonly riebeckite/crocidolite-derived material

Greenstone (Epidosite/Altered Diorite)

Metabasalt or Meta-andesite / Epidotized Diorite

Likely dark green-black tumbled stone (possibly serpentine)

Unconfirmed; appearance is consistent with serpentine, a group of hydrated magnesium silicate minerals

Serpentinite with green serpentine inclusion

Serpentinite; serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile, with possible magnetite

Red Jasper with Quartz Vein

Microcrystalline quartz (Chalcedony), SiO2

Unakite

Granitic rock composed of pink orthoclase feldspar, green epidote, and clear quartz

Weathered quartz-rich pebble, possibly quartzite or granite fragment

Quartzite (mostly SiO₂), though the specimen may contain feldspar and other silicates

Blue-gray quartz-rich rock, likely sodalite-bearing syenite or granite

Probable sodalite-bearing nepheline syenite; composition may include quartz, feldspar, sodalite, and dark mafic minerals

Gabbroic or basaltic rock with weathered veins

Likely mafic igneous rock, possibly olivine gabbro or porphyritic basalt; exact identification requires testing

Tumbled greenish jasper

Jasper, microcrystalline quartz (SiO₂) with iron-bearing and clay-mineral impurities

Weathered iron-rich rock, possibly laterite or altered basalt

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

Likely native copper nugget

Native copper (Cu)

Likely tumbled calcite or limestone

Calcite (CaCO₃), possibly microcrystalline limestone

Turquoise

Hydrated phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)

Mica-rich schist (likely quartz-mica schist)

Quartz–mica schist; chiefly quartz with muscovite and/or biotite

Greenstone (likely serpentine-rich metamorphic rock)

Serpentinite, composed chiefly of serpentine-group minerals, approximately Mg₃Si₂O₅(OH)₄; identification from the image is tentative.

Ruby in Fuchsite

Corundum var. Ruby in Chromium Muscovite rock

Serpentine-rich rock (possibly lizardite/serpentinite)

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

Lapis Lazuli

Lapis Lazuli (Metamorphic rock primarily composed of Lazurite, Calcite, and Pyrite)

Likely serpentinite (serpentine-rich rock)

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

Quartz vein with iron oxides and possible sulfide minerals

Predominantly quartz (SiO₂), with limonite/goethite staining and possible chalcopyrite or other sulfides; the colorful metallic-looking flecks are not identifiable with certainty from the photo.

Brecciated Jasper (Polished)

Silicon Dioxide (SiO2) with Iron Oxide Impurities

Milky quartz with dark mineral veins

Quartz, silicon dioxide (SiO₂), likely massive vein quartz; dark veins may be chlorite, mica, iron/manganese oxides, or a sulfide mineral

Polished brecciated jasper

Microcrystalline quartz (SiO₂), commonly with iron oxides and altered volcanic fragments

Unakite

Epidote–orthoclase–quartz granite (unakite)

Greenstone (likely metamorphosed basalt)

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

Greenstone, likely altered basalt (possibly serpentinite)

Metabasalt/greenschist; commonly chlorite–actinolite–epidote ± serpentine

Likely serpentine-rich rock (serpentinite)

Serpentinite, composed mainly of serpentine-group minerals (e.g., lizardite, antigorite, or chrysotile); exact identification is uncertain from the image alone

Greenstone (Chert)

Microcrystalline Silica (SiO2) with chlorite/epidote inclusions

Polished agate-bearing rock

Chalcedony (microcrystalline quartz, SiO₂) with iron-oxide inclusions; likely agate in host rock

Green Serpentine

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

Likely hornblende amphibolite fragment

Amphibolite, chiefly hornblende and plagioclase feldspar

Weathered volcanic rock, likely altered basalt

Altered basalt (fine-grained mafic volcanic rock; exact identification requires testing)

Weathered volcanic rock, likely altered andesite

Altered andesite; predominantly plagioclase and volcanic pyroxene/amphibole, with secondary iron oxides and clay minerals

Weathered greenish rock fragment

Indeterminate; possibly epidote- or chlorite-bearing altered silicate rock

Serpentine-rich rock (probable serpentinite)

Serpentinite; predominantly serpentine-group minerals, commonly antigorite, lizardite, or chrysotile, with possible magnetite and carbonate

Greenstone (or River-tumbled Basalt / Greywacke with Epidote)

Metabasalt / Greenschist facies rock

Greenstone / River Jadeite pebble

Metavolcanic rock / Chlorite or Actinolite-rich schist

Unakite

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

Red-and-green jasper

Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides and possibly chlorite/epidote

Weathered stone, likely sandstone or altered volcanic rock

Indeterminate; possibly quartz-rich sandstone or weathered tuff