Metamorphic (Altered Igneous Rock)

Lapis Lazuli

Sodium aluminum silicate with sulfur (main component: Lazurite [(Na,Ca)8(AlSiO4)6(SO4,S,Cl)2])

Quartz-bearing altered rock, likely quartzite or hydrothermal quartz vein

Predominantly quartz (SiO₂), with possible chlorite/serpentine and iron-oxide alteration

Serpentine-rich altered rock (likely serpentinite)

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

Weathered volcanic rock, likely basalt or andesite

Fine-grained mafic to intermediate volcanic rock; probable basalt (plagioclase ± pyroxene, with alteration minerals)

Quartz-rich granite or granitic pegmatite cobble

Granite/pegmatite, chiefly quartz (SiO₂) with feldspar and minor iron-oxide staining

Greenstone / Basalt

Aphanitic Mafic Igneous Rock (likely altered Basalt)

Water-worn greenstone pebble

Greenstone (metamorphosed mafic volcanic rock; commonly chlorite–actinolite–epidote-bearing metabasalt)

Weathered iron-rich rock (likely basalt or ironstone)

Probable altered basalt; exact identification requires testing

Weathered iron-rich basalt or laterite

Basalt, likely limonitized/goethite-stained; exact identification requires testing

Lapis Lazuli (Low Grade)

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2)

Iron-stained milky quartz vein

Quartz (SiO₂), with iron-oxide/hydroxide staining and minor dark inclusions

Weathered quartz-rich rock, possibly granite or quartzite

Likely quartz–feldspar aggregate; precise identification requires testing

Greenstone pebble

Likely chlorite- or epidote-bearing metamafic rock (metabasalt/greenschist)

Polished porphyritic volcanic rock, likely andesite or basalt

Porphyritic andesite/basalt; commonly plagioclase and pyroxene phenocrysts in a fine volcanic groundmass

Iron-stained quartz-rich rock, possibly quartzite or chalcedony

Quartz (SiO₂), likely in a quartzite/chalcedonic matrix with iron oxides

Vesicular basalt (likely weathered scoria)

Vesicular mafic volcanic rock, chiefly plagioclase, pyroxene, and volcanic glass; commonly ~45–52% SiO₂

Weathered mafic metamorphic rock, likely amphibolite or hornblende gneiss

Amphibolite; primarily hornblende amphibole and plagioclase feldspar, with possible biotite, quartz, and iron oxides

Dark vesicular volcanic rock, likely basalt

Basalt (predominantly plagioclase and pyroxene, with possible olivine and iron oxides)

Weathered volcanic rock, likely altered basalt/andesite

Fine-grained mafic to intermediate volcanic rock; possible chlorite–calcite alteration

Weathered volcanic rock, likely altered basalt

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

Banded calcite (likely marble or calcite-rich limestone)

Calcite, CaCO₃; possibly calcitic marble

Greenschist (likely chlorite schist)

Greenschist-facies metamorphic rock; commonly quartz + chlorite ± actinolite, epidote, albite, and mica

Weathered limestone or calcitic cave deposit

Calcite (CaCO₃), likely porous limestone/travertine

Weathered basaltic rock

Basalt, likely an iron-rich, oxidized variety

Likely altered granite or feldspathic gneiss

Quartz–feldspar–mica rock; exact identification requires testing

Likely serpentine-rich metamorphic rock

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile), with possible magnetite and minor chlorite/talc

Copper Ore / Altered Granodiorite

Cupriferous rock with silicate gangue

Orbicular jasper (likely brecciated jasper)

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

Quartz vein in greenstone/altered mafic rock

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

Weathered reddish-brown rock fragment

Probably altered basalt or fine-grained volcanic rock; exact identification requires testing

Polished lapis lazuli slab

Lapis lazuli; primarily lazurite (Na₃Ca(Si₃Al₃)O₁₂S), with calcite and pyrite

Weathered quartz-rich rock, likely quartzite or milky quartz

Quartzite; chiefly quartz (SiO₂), with minor iron-oxide staining and possible feldspar/clay impurities

Serpentinite (probable)

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

Orbicular/porphyritic stone, likely weathered igneous rock

Indeterminate; possibly orbicular granite or a weathered felsic porphyry

Weathered quartz-rich rock, likely arkose or quartzite

Quartz-dominant siliciclastic rock; probable arkose (quartz + feldspar), possibly weakly metamorphosed quartzite

Polished Unakite pebble

Unakite: pink potassium feldspar and green epidote in quartz-rich rock

Unakite

Unakite (Epidote-Feldspar rock)

Likely tumbled dark volcanic rock

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

Rhyolite or jasper-bearing volcanic rock

Rhyolite, likely altered and silicified; red coloration may come from hematite

Weathered basalt pebble

Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase, clinopyroxene, and iron-rich oxides

Likely limestone or marble fragment

Calcite-rich carbonate rock; CaCO₃

Quartz-rich granitic rock, possibly weathered pegmatite

Granite or pegmatitic quartz–feldspar aggregate; mainly SiO₂ quartz with K-feldspar/plagioclase and minor mica