Metamorphic (Altered Igneous Rock)

Wollastonite

Calcium Inosilicate, CaSiO3

Greenstone / altered basalt fragment

Likely chlorite–epidote–actinolite altered basalt; exact identification requires testing

Serpentinite (serpentinized ultramafic rock)

Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), commonly with magnetite, brucite, and relict olivine/pyroxene

Lapis Lazuli

Lapis lazuli (a rock primarily composed of Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Lapis Lazuli (in Matrix)

Na8[Al6Si6O24]S2 (Lazurite as the primary component)

Lapis Lazuli

Lapis Lazuli (A complex rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Rhodonite

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

Purple Dyed Dalmatian Stone

Dyed Peralkaline Trachyte

Pink Granite (Unakite-bearing Granite Pebble)

Granite (rich in Potassium Feldspar / Orthoclase)

Tumbled granite

Granite, chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende

Dragon Blood Jasper (Lizard Stone/Septarian Chalcedony)

Epidote with Black Hornblende and White Quartz mixture

Milky quartz in weathered host rock

Quartz, silicon dioxide (SiO₂), likely occurring in altered igneous or metamorphic matrix

Dark gray fine-grained stone, likely basalt or andesite

Basalt–andesite volcanic rock; commonly composed of plagioclase, pyroxene, and possibly olivine or magnetite

Polished greenstone pebble (likely epidote-bearing stone)

Epidote–chlorite amphibolite or altered basalt; composition likely epidote, chlorite, amphibole/pyroxene, and iron oxides

Weathered granite-like rock

Granite or granodiorite; quartz–feldspar–mica aggregate

Porphyritic volcanic rock, likely porphyritic andesite

Porphyritic andesite; chiefly plagioclase and pyroxene/amphibole phenocrysts in a fine volcanic groundmass

Tumbled granite or granitic gneiss

Quartz–feldspar–mica granitoid; likely biotite granite, possibly foliated gneiss

Weathered greenstone

Metamorphosed mafic rock, commonly chlorite–actinolite schist or altered basalt

Weathered porphyritic volcanic rock (likely andesite or basalt)

Aphanitic to porphyritic andesite–basalt; composition commonly plagioclase, pyroxene, and minor iron oxides

Tumbled greenish-gray stone, likely serpentinite or altered basalt

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

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Lapis Lazuli

Complex mixture of minerals (lazurite, calcite, pyrite, and sodalite); (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Greenstone (Metabalt)

Chlorite-actinolite schist (Greenstone)

Gabbroic or basaltic rock with weathered veins

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

Pink feldspar-rich granite or pegmatite

Potassium-feldspar granite; chiefly microcline/orthoclase (KAlSi₃O₈), quartz, and minor mica

Weathered green-gray stone, likely serpentinite or chlorite-rich metamorphic rock

Probable serpentinite (antigorite–lizardite), possibly chlorite schist or altered basalt

Weathered granite (likely biotite granite)

Granite; interlocking quartz, feldspar, and mica, commonly with biotite

Copper-bearing basalt or volcaniclastic rock

Cuprite–malachite-bearing mafic volcanic rock; likely basalt with copper sulfides/oxides

Lapis Lazuli (Tumbled Stone)

Na6Ca2(Al6Si6O24)(SO4,S,Cl)2 (predominantly Lazurite)

Citrine Quartz

Silicon dioxide (SiO2)

Dyed Agate

SiO2

Lapis Lazuli (in jewelry setting)

Na8[Al6Si6O24]n(S,Cl,SO4,OH)2 (Lazurite-rich rock)

Lapis Lazuli

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

Serpentinized ultramafic rock with magnesite

Serpentinite, chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with likely magnesite (MgCO₃) and minor chromite/magnetite

Unakite

Altered granite (Epidote, Orthoclase Feldspar, and Quartz)

Weathered rounded pebble

Likely altered granite or granitic gneiss fragment; exact identification is uncertain from the image

Copper Ore / Altered Granodiorite

Cupriferous rock with silicate gangue

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

Quartz-rich granite or granitic pegmatite cobble

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

Smoky Quartz

Silicon dioxide (SiO2)

Lapis Lazuli (Low Grade)

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

Weathered granite or granitic gneiss slab

Granitic rock, chiefly quartz, feldspar, and mica; exact identification is uncertain from the photograph