Sedimentary Rock (Altered)

Likely weathered basalt or volcanic rock

Basalt; mainly plagioclase feldspar, pyroxene, and commonly olivine

Serpentinite (probable)

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

Likely weathered quartz-bearing rock (uncertain identification)

Possibly quartz-rich granite or granitic aplite; exact identification requires a clearer, larger image and tests

Greenstone / altered basalt (probable)

Chlorite–epidote–actinolite-rich metabasalt; exact identification requires testing

Small brown mineral specimen, possibly mica-bearing rock

Unidentified from the image; exact mineral species cannot be determined at this scale

Unakite

Epidotized Granite

Likely weathered blue-gray basalt

Basalt, a fine-grained mafic volcanic rock; commonly plagioclase + pyroxene ± olivine and iron oxides

Tumbled jasper pebble

Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions

Greenstone (Epidosite)

Epidosite (Metamorphosed Basalt/Diabase)

Weathered banded gneiss (probable)

Gneiss; quartz–feldspar–mica metamorphic rock

Greenstone / altered mafic rock

Likely serpentinite or chlorite-rich metabasalt; exact identification requires testing

Porphyritic basalt or andesite

Porphyritic volcanic rock; typically plagioclase phenocrysts in a fine mafic/intermediate groundmass

Weathered granite or granitic gneiss fragment

Granite; chiefly quartz (SiO₂), feldspar, and mica, with iron-oxide weathering

Weathered quartz-rich metamorphic rock, possibly gneiss or quartzite

Quartz–feldspar–mica metamorphic aggregate; exact identification requires testing

Epidote in Matrix (Unakite-related)

Epidosite (Ca2(Al,Fe)3(SiO4)3(OH))

Serpentine-rich altered ultramafic rock

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

Dark green, fine-grained pebble (likely amphibolite or greenstone)

Likely amphibolite, composed mainly of hornblende and plagioclase; exact identification requires examination

Drill core of probable granite or granodiorite

Crystalline quartz–feldspar–mica rock; exact composition cannot be confirmed from the photograph

Greenstone / altered mafic rock

Likely chlorite–actinolite metabasalt (greenschist); exact identification requires testing

Unakite

Altered Granite (Plagioclase-Epidote-Quartz Rock)

Conical fossil shell or shell fragment

Likely a gastropod shell fragment; exact taxon indeterminate from the image

Rounded green-gray pebble, likely greenstone

Greenstone (metamorphosed mafic rock; commonly chlorite- and actinolite-bearing)

Unakite

Altered Granite (Epidotized Granite)

Greenstone (likely altered basalt or greenschist)

Greenschist-facies mafic rock; commonly chlorite–actinolite–albite ± epidote, or chlorite-altered basalt

Unakite

Altered Granite (Epidote-bearing Granitic Rock)

Unakite

Altered Granite (Epidotized Granite)

Iron-stained porphyritic volcanic rock (possibly altered tuff)

Likely porphyritic andesite or volcanic tuff; exact identification requires examination of a fresh surface

Weathered greenish-gray rock fragment, likely chlorite-rich schist

Tentatively chlorite schist; exact identification requires closer examination

Polished serpentine (likely)

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

Weathered granite or granitic pegmatite fragment

Granitic rock, chiefly quartz, feldspar, and mica; exact identification requires testing

Tumbled dark-green stone, possibly serpentine

Undetermined; serpentine-group rock (predominantly serpentine minerals) is a tentative visual identification

Tumbled greenstone (likely serpentine or chlorite-rich stone)

Serpentinite, approximately Mg₃Si₂O₅(OH)₄; exact identification requires testing

Tumbled green-brown stone, likely serpentine

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

Quartz with Sericite and Cinnabar

Silicon Dioxide (SiO2) with muscovite/sericite and mercury sulfide (HgS)

Green-and-white mottled stone, possibly serpentinite

Likely serpentinized ultramafic rock; exact identification is uncertain from the photograph

Serpentinite (probable)

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

Unakite (likely)

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

Weathered mineralized rock fragment

Indeterminate; likely quartz–feldspar-rich lithic material with iron-oxide staining

Possible weathered iron-rich rock or breccia

Indeterminate; likely iron-oxide-stained silicate rock, possibly basaltic breccia or limonite-bearing material

Lapis Lazuli

Lapis Lazuli (Complex aggregate including Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Unakite

Altered Granite (Epidotized Feldspar with Quartz)

Presumed K2 granite (K2 stone)

K2 granite, an altered granitic rock composed mainly of quartz, feldspar, and white mica, with blue azurite spots