Sedimentary Rock (Altered)

Lapis Lazuli

Lapis lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)

Small green-gray pebble (likely serpentinite)

Serpentinite, composed mainly of serpentine-group minerals

Blue-green copper mineral specimen, likely chrysocolla with malachite and quartz

Chrysocolla (hydrated copper aluminum silicate; approximate formula (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O), possibly mixed with malachite (Cu₂CO₃(OH)₂) and quartz

Polished turquoise cabochon

Turquoise, hydrous copper-aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Quartz-rich pegmatitic rock with possible epidote or chlorite

Hydrothermal/pegmatitic quartz-bearing rock; identifiable minerals may include quartz (SiO₂), feldspar, and epidote/chlorite

Weathered granite or granitic gneiss

Quartz–feldspar–mica rock; likely granitoid, possibly weakly gneissic

Unakite

Altered granitic rock (Epidote, Orthoclase Feldspar, Quartz)

Gneiss

Gneiss

Tumbled yellow-green pebble, likely serpentine or quartzite

Provisional: serpentine-group rock, chiefly Mg₃Si₂O₅(OH)₄; exact identification requires testing

Lapis Lazuli

Lazurite-dominant Metamorphic Rock (complex aluminosilicate)

Lapis Lazuli

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

Weathered granite or granitic gneiss

Quartz–feldspar–mica granitic rock; possible biotite gneiss

Lapis Lazuli

Lapis Lazuli (Mineral composition: Lazurite, Calcite, Sodalite, and Pyrite)

Lapis Lazuli

Lapis Lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)

Unakite

Altered granitic rock composed of pink orthoclase feldspar, green epidote, and quartz

Weathered granitic rock (likely granite or granodiorite)

Granite–granodiorite; quartz + feldspar + biotite/hornblende

Copper-bearing rock, likely chrysocolla–malachite with limonite

Chrysocolla (hydrated copper aluminosilicate) and malachite (Cu₂CO₃(OH)₂), with iron oxides and possible native copper

Likely biotite-rich granite or mica schist

Quartz–feldspar–biotite rock; exact identification is uncertain from the image

Tumbled greenish-gray stone, likely serpentinite or altered basalt

Probable serpentinite (serpentine-group minerals), possibly chlorite-/epidote-bearing basalt

Weathered metamorphic rock, likely quartz-mica schist

Quartz–mica schist; composition typically quartz + muscovite/biotite ± feldspar

Polished basalt pebble (likely basalt with quartz/zeolite veins)

Basalt; mainly calcic plagioclase and pyroxene, with possible alteration minerals such as quartz, calcite, or zeolites

Polished pegmatitic granite (likely graphic granite)

Coarse-grained granitic rock composed chiefly of quartz, feldspar, and biotite/hornblende

Polished serpentine-rich metamorphic rock

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

Greenish chert or serpentine-rich rock

Likely microcrystalline quartz (SiO₂), possibly with chlorite/serpentine inclusions

Likely weathered granite or granitic pebble

Granite; chiefly quartz, feldspar, and mica

Serpentinite (probable)

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

Small brown mineral fragment, possibly quartz/chert

Uncertain; likely microcrystalline quartz (SiO₂) or a weathered silicate rock

Unakite-like polished pebble

Epidote–K-feldspar–quartz rock (likely altered granite; identification from image is provisional)

Greenstone / Basalt

Aphanitic Mafic Igneous Rock (likely altered Basalt)

Tumbled jasper or rhyolitic porphyry

Silicic volcanic rock, likely rhyolite (quartz- and feldspar-rich), possibly jasperized

Zebra Jasper

Silicon dioxide (microcrystalline quartz), SiO2

Rounded greenish river pebble

Likely altered basalt or greenstone (metabasalt); exact identification requires testing

Orbicular jasper (likely brecciated jasper)

Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and silica-rich clasts

Red jasper (likely polished/chipped fragment)

Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides

Likely weathered iron-rich rock

Probable basalt or limonite/goethite-stained mafic rock; exact identification requires testing

Iridescent quartz-bearing rock, likely bornite/chalcopyrite-bearing quartzite

Quartz (SiO₂) with probable chalcopyrite (CuFeS₂) and/or bornite (Cu₅FeS₄)

Milky quartz-rich rock

Quartz (silicon dioxide, SiO₂), likely with mica or feldspar inclusions

Quartz vein in greenstone/altered mafic rock

Quartz (SiO₂) with chlorite–epidote-rich metabasalt or greenstone

Greenstone (Altered Mafic Rock)

Greenschist / Meta-basalt

Greenstone, likely chlorite-rich schist

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

Iron-stained weathered volcanic rock (probable basalt/andesite)

Altered basaltic–andesitic rock, chiefly plagioclase and pyroxene with iron oxides/hydroxides

Weathered copper-bearing volcanic rock (likely altered basalt/andesite)

Hydrothermally altered basalt or andesite; green coloration may reflect chlorite, epidote, or copper minerals such as chrysocolla