Metamorphic (Altered Igneous Rock)

Rounded yellow-green pebble, likely serpentine or quartzite

Provisional: serpentinite/serpentine-rich rock; alternatively iron-stained quartzite

Greenstone pebble (likely altered basalt)

Chlorite–actinolite–epidote altered basalt; precise identification requires testing

Lapis Lazuli (Lazurite crystals on Marble)

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

Garnet Gneiss

Garnetiferous quartzo-feldspathic gneiss

Greenstone / altered mafic rock

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

Unidentified gray-green rock, possibly serpentinite or altered basalt

Tentatively serpentinite (serpentine-group minerals), but identification is uncertain from the blurred image

Smoky Quartz with Inclusions

Silicon Dioxide (SiO2)

Serpentine

Antigorite, Lizardite, or Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Unakite

Altered Granite (Epidotized Granite)

Green Aventurine (or Jadeite/Nephrite Jade)

SiO2 (Silicon Dioxide) - Aventurine Quartz

Weathered gray metamorphic rock, likely slate or phyllite

Foliated metapelite; composition commonly quartz, mica, and chlorite

Lapis Lazuli

Lapis Lazuli (Primary mineral: Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Unakite / Red Jasper beach pebble

Altered Granite (Epidotized Feldspar and Quartz)

Serpentine (Nephrite-like River Cobble)

Serpentinite (Hydrous Magnesium Iron Silicate)

Polished green stone, likely serpentine or altered basalt

Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄; exact identification requires testing

Unakite

Epidotized Granite

Serpentinite

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

Dragon Blood Jasper

Epidote-rich Quartzite (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))

Weathered basalt or volcanic rock

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

Serpentine

Serpentinite (group of hydrous magnesium iron phyllosilicate minerals)

Citrine Geode Fragment

Citrine (Silicon Dioxide with Iron Impurities), SiO2

Veined quartz-bearing metamorphic rock

Likely quartzite or siliceous schist with iron-oxide staining

Weathered volcanic rock, likely basalt

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

Painted Rock / Geode Specimen

Silicon Dioxide with artificial pigment coating

Greenstone

Metabasalts and metavolcanics

Likely weathered quartz-bearing rock

Probably quartz-rich pegmatite or altered feldspathic rock; exact identification is uncertain from the image

Tumbled granite

Granite, chiefly quartz, feldspar, and mica

Unakite (likely)

Epidote–pink feldspar–quartz rock; commonly termed unakite

Serpentine / Serpentinite (with Weathering Crust)

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

Greenstone (Metabalt)

Chlorite schist / Altered Basalt

Tumbled serpentine

Serpentinite; chiefly serpentine-group minerals, Mg3Si2O5(OH)4

Possible weathered quartz-rich rock or iron-stained mineral fragment

Indeterminate; possibly quartz (SiO₂) with iron-oxide inclusions

Greenstone / Serpentinite

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

Lapis Lazuli

Lazurite-rich metamorphic rock (complex silicate)

Greenstone / altered mafic rock

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

Water-worn green pebble

Likely altered basalt or greenstone; precise identification requires testing

Epidosite with Quartz (Unakite-variant or Jasper)

Epidotized Metasomatite

Ruby (Corundum)

Corundum (Aluminum Oxide with Chromium), Al2O3:Cr

Serpentine

Antigorite, Lizardite, or Chrysotile; (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Unakite (or Polished Jasper Pebble)

Altered Granite (Epidote-Orthoclase Rock)

Lapis Lazuli

Complex rock primarily containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Lapis Lazuli (polished cabochon)

Lazurite-rich metamorphic rock (approx. Na6Ca2Al6Si6O24(SO4,S,Cl)2)