Metamorphic (Altered Igneous Rock)

Greenstone, likely altered basalt

Metabasalt (chlorite–actinolite–epidote assemblage), likely greenschist-facies greenstone

Lapis Lazuli

Na8(Al6Si6O24)S2 (Lazurite is the primary constituent mineral)

Granite-like rock

Felsic intrusive igneous rock, probably granitic or granodioritic

Dumortierite in Quartz

Silicon Dioxide with Aluminium Borosilicate (SiO2 + (Al,Fe7+)7(BO3)(SiO4)3O3)

Unakite

Unakite (altered granitic rock)

Unakite / Feldspar Veined Metamorphic Pebble

Metamorphic Rock with K-Feldspar, Epidote, and Quartz

Unakite

Unakite (Altered Granite)

Milky Quartz with Talc / Serpentine

Silicon Dioxide (SiO2) with Mg3Si4O10(OH)2

Unakite

Altered Granite (Unakite)

Quartz-veined altered rock

Likely quartz-bearing metasediment or altered igneous rock; vein mineral: quartz (SiO₂)

Serpentinite (likely)

Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, or chrysotile)

Unakite

Epidotized Granite

Weathered quartz-rich rock, possibly granite or gneiss

Granite-like aggregate: quartz (SiO₂), feldspar, and minor dark minerals

Epidote

Calcium aluminum iron silicate (Ca2(Al, Fe)3(SiO4)3(OH))

Peridotite

Ultramafic igneous rock (primarily olivine and pyroxene)

Mixed river-worn rock and mineral collection

Mostly quartz/quartzite, feldspar-bearing granitoid, chert, and mafic volcanic rocks; exact species vary by pebble

Unidentified orange-brown rock fragment

Likely weathered iron-rich volcanic rock or ochre-bearing material; exact identification is impossible from the blurred image

Quartz on Greenstone

Silicon Dioxide (SiO2) on Altered Igneous Geologic Unit

Unakite

Altered Granite (Epidotized Granite)

Greenstone (Altered Mafic Rock)

Greenschist / Meta-basalt

Unakite

Unakite (altered granitic rock)

Epidote in Quartz (Epidosite)

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

Serpentine

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

Epidote (with Quartz and Feldspar)

Epidote (unakalite/unite), Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)

Epidote

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

Greenstone

Epidiorite / Altered Basalt

Gabbroic rock, possibly hornblende gabbro

Gabbro; coarse-grained mafic silicate rock dominated by plagioclase and pyroxene, with possible hornblende and magnetite

Likely weathered quartz-bearing rock (uncertain identification)

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

Tiger's Eye

Silicon Dioxide with Crocidolite (SiO2)

Quartz-veined metamorphic rock, likely greenschist or altered metavolcanic

Chlorite–actinolite–epidote-bearing metavolcanic rock with quartz veins; exact identification requires testing

Likely vesicular basalt with weathering minerals

Basalt, primarily plagioclase and pyroxene, with possible iron oxides and secondary zeolite/carbonate minerals

Weathered volcanic rock, likely andesite or basaltic-andesite

Fine-grained plagioclase–pyroxene volcanic rock; possible altered andesite (exact identification requires testing)

Serpentine

(Mg,Fe)3Si2O5(OH)4

Weathered granite or granitic gneiss

Granite; chiefly quartz, feldspar, and mica

Banded River Cobble with Mafic Dike

Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion

Greenish translucent mineral fragment

Indeterminate; possibly serpentine, epidote, or green glassy feldspar

Greenstone / Basalt with Amygdule

Amygdaloidal Basalt (altered to Greenstone)

River Cobble (Weathered Granitoid)

Granodiorite / Quartz Diorite

Lapis Lazuli

Lazurite-rich metamorphic rock

Unakite

Altered Granite (Epidotized Granite)

Quartz Vein in Greenstone

Hydrothermal Quartz (SiO2) with Chlorite/Epidote Schist host rock

Blue-gray quartz-bearing metamorphic rock (likely gneiss or schist)

Quartz–feldspar–mica rock; exact identification requires testing