Metamorphic (Altered Igneous Rock)

Weathered green metamorphic rock, possibly serpentinite or greenstone

Likely serpentinite (serpentine-group minerals) or chlorite/epidote-rich greenschist; exact identification requires testing

Sodalite

Na8(Al6Si6O24)Cl2

Pyrite-bearing quartz vein rock

Pyrite (FeS₂) with quartz (SiO₂), likely in a schistose or altered host rock

Unakite

Altered Granite (Epidotized Granite)

Unakite

Altered Granite (Epidotized Granite)

Weathered quartz-rich rock, possibly pegmatitic granite

Likely quartz–feldspar aggregate; exact identification requires testing

Unakite / Red Jasper beach pebble

Altered Granite (Epidotized Feldspar and Quartz)

Tumbled greenstone-like pebble

Likely serpentine or chlorite-rich metamorphic rock; exact identification requires testing

Quartz-veined weathered host rock

Quartz (SiO₂) in a likely altered limestone or metamorphic carbonate host

Green serpentine (likely serpentine-rich stone)

Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; composition approximately Mg₃Si₂O₅(OH)₄

Likely mica-rich schist

Mica schist, composed mainly of muscovite and/or biotite with quartz; exact identification is uncertain from the photo.

Quartz-bearing dark rock, possibly hornfels or basalt

Probable quartz–feldspar rock; exact identification requires testing

Lapis Lazuli (in Matrix)

Lazurite-bearing Metamorphic Rock (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2

Lapis Lazuli (Lazurite crystals on Marble)

Lazurite / (Na,Ca)8[(S,Cl,SO4,OH)2|(AlSiO4)6]

Unakite

Altered Granite (Epidotized Feldspar with Quartz)

Lapis Lazuli

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

Unakite (or Polished Jasper Pebble)

Altered Granite (Epidote-Orthoclase Rock)

Mica-rich schist (likely quartz-mica schist)

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

Likely tumbled lepidolite-bearing mica schist

Lepidolite-rich mica schist; chiefly lepidolite/muscovite mica, quartz, and possibly feldspar

Weathered greenstone / altered rock fragment

Probable chlorite–epidote–actinolite-rich metavolcanic rock; exact identification requires testing

Greenstone (Metabalt)

Chlorite schist / Altered Basalt

Dalmatian jasper (often sold as Dalmatian stone)

Porphyritic alkali feldspar–quartz syenite, commonly with black arfvedsonite/aegirine-group amphibole inclusions

Serpentine

Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Epidote in Matrix (Unakite-related)

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

Green tumbled stone, possibly serpentine

Likely serpentine-group rock, chiefly serpentine minerals (approx. Mg₃Si₂O₅(OH)₄); identification is uncertain from the photograph.

Weathered iron-rich rock fragment

Likely limonite/goethite-bearing rock, possibly altered pyrite or mica schist

Leopard jasper (orbicular jasper)

Silicified volcanic rock, chiefly microcrystalline quartz/chalcedony (SiO₂) with feldspar and iron-oxide inclusions

Unakite

Altered Granite (Epidote, Orthoclase Feldspar, Quartz)

Unakite

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

Greenstone, likely altered basalt (possibly serpentinite)

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

Weathered metamorphic rock, likely greenschist or amphibolite

Chlorite–actinolite schist/amphibolite; composition likely quartz, feldspar, chlorite, amphibole, and epidote

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

Tentatively chlorite schist; exact identification requires closer examination

Epidote

Epidote - {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Banded gneiss (likely biotite-bearing)

Gneiss; quartz–feldspar–mica assemblage, with possible iron-oxide staining

Weathered greenstone (metamorphosed mafic rock)

Chlorite- and epidote-bearing metabasalt; exact identification requires examination

Iron-stained quartz-rich rock (likely ferruginous quartzite)

Quartz-rich ferruginous rock, probably quartzite with iron-oxide staining (SiO₂ with hematite/goethite)

Small banded metamorphic rock fragment

Indeterminate foliated metamorphic rock; possibly mica schist or gneiss

Likely greenstone (metamorphosed basalt)

Metabasalt; commonly composed of chlorite, actinolite, epidote, and albite

Weathered greenish-gray rock fragment, likely serpentinite or chlorite-rich metamorphic rock

Tentative identification: serpentinite (serpentine-group minerals) or chlorite-bearing metamorphic rock; image alone cannot distinguish them reliably

Garnet Gneiss

Garnetiferous quartzo-feldspathic gneiss

Small reddish-brown mineral fragment

Uncertain; possibly iron-stained quartz, feldspar, or garnet

Rounded pale beach cobble, likely quartzite or massive quartz

Quartzite (mostly microcrystalline SiO₂); exact identification requires testing