Metamorphic (Altered Igneous Rock)

Serpentinite

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

Unakite

Altered Granite (Epidotized Feldspar with Quartz)

Quartz-bearing metamorphic rock, possibly quartzite or hornfels

Mostly quartz (SiO₂), with probable iron-oxide and dark silicate minerals

Weathered greenish stone, possibly serpentinite or altered basalt

Tentatively serpentinite (mostly serpentine minerals) or chlorite-rich basalt; exact identification requires testing

Greenstone / altered mafic rock

Likely chlorite–actinolite schist or metabasalt; exact identification requires testing

Lapis Lazuli

Lazurite-rich metamorphic rock (complex silicate)

Greenstone (likely chlorite- or actinolite-rich metabasalt)

Metamorphosed mafic volcanic rock; commonly greenschist-facies basalt, composed chiefly of chlorite, actinolite, epidote, and albite

Weathered mafic metamorphic rock, likely serpentinite or altered basalt

Probably serpentinized ultramafic rock; commonly dominated by serpentine-group minerals, with magnetite and altered pyroxene/olivine

Blue Tiger's Eye

Crocidolite in Quartz (altered)

Weathered basaltic cobble

Altered basalt, predominantly plagioclase and pyroxene

Greenstone / altered basalt (probable)

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

Epidote

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Epidote

Epidote, Ca₂(Al,Fe³⁺)₃(SiO₄)₃(OH); commonly occurring as an epidote-rich rock

Weathered sandstone or quartz-rich sedimentary rock

Likely quartz arenite or feldspathic sandstone; exact identification requires testing

Rhodonite

Inosilicate, (Mn,Fe,Mg,Ca)SiO3

Iron-stained quartz-rich rock, possibly quartzite

Quartzite (tentative; predominantly quartz, SiO₂)

Epidosite with Quartz (Unakite-variant or Jasper)

Epidotized Metasomatite

Weathered volcanic rock, likely basalt

Basalt; commonly composed of plagioclase, pyroxene, and iron-rich oxides

Citrine

Silicon Dioxide (SiO2)

Serpentine

Serpentinite (group of hydrous magnesium iron phyllosilicate minerals)

Weathered basalt or volcanic breccia

Fine-grained mafic volcanic rock, likely basalt (plagioclase–pyroxene ± olivine), possibly brecciated

Veined quartz-bearing metamorphic rock

Likely quartzite or siliceous schist with iron-oxide staining

Water-worn green pebble

Likely altered basalt or greenstone; precise identification requires testing

Weathered gray metamorphic rock, likely slate or phyllite

Foliated metapelite; composition commonly quartz, mica, and chlorite

Greenstone / Serpentinite

Antigorite/Lizardite series (Mg,Fe)3Si2O5(OH)4

Lapis Lazuli

Lapis Lazuli (Complex metamorphic rock primarily composed of Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2, Calcite, and Pyrite)

Rounded greenish stone, possibly serpentinite or greenstone

Likely serpentinite (hydrated ultramafic rock; chiefly serpentine-group minerals), but the photograph is insufficient for confident species identification

Quartz-rich altered rock, possibly quartz vein with mica

Microcrystalline to coarse quartz (SiO₂) with probable muscovite/biotite mica and iron-oxide staining

Weathered feldspar-rich igneous rock, likely granite or granodiorite fragment

Granite–granodiorite; chiefly quartz (SiO₂), plagioclase and potassium feldspar, with minor dark biotite/hornblende

Serpentine / Serpentinite (with Weathering Crust)

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

Lapis Lazuli (Low Grade)

Lapis Lazuli (Metamorphic rock containing lazurite, calcite, and pyrite)

Dark, mica-rich metamorphic rock (possibly schist)

Mica schist, tentatively; exact identification is limited by the small, partly obscured specimen

Weathered gray metamorphic rock, likely slate or phyllite

Fine-grained foliated metamorphic rock; commonly quartz–mica–chlorite, possibly chlorite phyllite

Likely granite or granitic gneiss

Quartz–feldspar–mica rock; exact identification requires closer inspection

Weathered basalt or volcanic rock

Likely vesicular basalt; composition dominated by plagioclase and pyroxene, with possible iron-oxide alteration

Weathered granite (likely granitic rock)

Granite; primarily quartz, feldspar, and mica (variable composition)

Greenish chert or serpentine-rich rock

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

Tumbled greenstone (likely serpentine or chlorite-rich stone)

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

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)

Tumbled dark-green stone, possibly serpentine

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

Tumbled greenstone, likely serpentine or altered basalt

Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄; possibly chlorite/epidote-bearing mafic rock