Metamorphic (Altered Igneous Rock)

Tumbled epidote-bearing granite or amphibolite

Quartz–feldspar rock with dark amphibole/biotite and epidote; exact identification is uncertain from the image

Serpentine

Serpentine group, including Antigorite, Lizardite, and Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Banded quartz-rich metamorphic rock (likely quartzite or quartz-mica schist)

Quartzite/schist composed chiefly of SiO₂ quartz with mica, feldspar, and iron-oxide or copper-colored accessory minerals

Sugilite

KNa2(Fe,Mn,Al)2Li3Si12O30

Greenstone (Epidosite/Altered Diorite)

Metabasalt or Meta-andesite / Epidotized Diorite

Greenstone (River Pebble)

Metabasalt / Greenschist

Gold-bearing dark rock, possibly magnetite with iron-oxide staining

Likely magnetite (Fe₃O₄) with limonite/goethite; metallic patches may be gold or weathered sulfide, unconfirmed

Lapis Lazuli

Lapis lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)

Green-speckled pebble, likely epidote-bearing basalt or altered granite

Probable epidote (Ca₂(Al,Fe)₃(SiO₄)₃(OH)) in a mafic or felsic host; exact identification requires testing

Epidote

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

Greenish rock with white veins, possibly epidote or chlorite bearing rock with quartz/calcite veins

Altered mafic rock or Epidosite

Unakite

Altered Granite

Green-speckled igneous rock, likely epidote-bearing basalt or serpentinite

Tentatively epidote-bearing basalt (compositionally uncertain from the image)

Foliated metamorphic rock, likely gneiss with amphibolite or chlorite-rich bands

Biotite–quartz–feldspar gneiss, locally mafic amphibolite; mineral composition is uncertain from the photograph

Unakite

Epidotized Granite

Banded metamorphic rock, likely gneiss or metasedimentary slate

Quartz–feldspar–mica gneiss (tentative), possibly containing iron-oxide veins

Quartz-rich pegmatite with green epidote or chlorite

Pegmatitic quartz–feldspar rock, likely containing epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH)) and/or chlorite

Blue-gray quartz-rich rock, likely sodalite-bearing syenite or granite

Probable sodalite-bearing nepheline syenite; composition may include quartz, feldspar, sodalite, and dark mafic minerals

Rounded gray-green beach pebble

Likely basalt or fine-grained volcanic rock; exact identification requires testing

Mica-rich schist

Muscovite–quartz schist (tentative; image alone cannot confirm mineral composition)

Greenstone (Prase / Metavolcanic)

Metamorphosed volcanic rock (Greenstone)

Quartz-rich pegmatitic rock with possible epidote or chlorite

Hydrothermal/pegmatitic quartz-bearing rock; identifiable minerals may include quartz (SiO₂), feldspar, and epidote/chlorite

Rhodonite

Rhodonite (MnSiO3)

Weathered pegmatitic granite or feldspar-rich metamorphic rock

Quartz–feldspar rock, likely granitic pegmatite; exact identification requires testing

Greenstone (Chert)

Microcrystalline Silica (SiO2) with chlorite/epidote inclusions

Weathered quartz-rich rock, possibly quartzite or altered granite

Quartz-dominant silicate rock; exact identification requires a fresh surface and tests

Greenstone / River Jadeite pebble

Metavolcanic rock / Chlorite or Actinolite-rich schist

Small brown mineral fragment, possibly quartz/chert

Uncertain; likely microcrystalline quartz (SiO₂) or a weathered silicate rock

Unakite / Epidotized Granite

Metamorphic Granite (Epidote-Orthoclase-Quartz Rock)

Likely weathered granite or granitic pegmatite

Granite; chiefly quartz (SiO₂), feldspar, and mica

Unidentified weathered rock fragments

Likely mixed silicate rocks; specific identification requires testing

Likely tumbled greenstone (identity uncertain)

Greenstone: metamorphosed mafic volcanic rock, commonly composed of chlorite, actinolite, and epidote

Likely weathered quartz or feldspar grain

Uncertain; possibly quartz (SiO₂) or a feldspar mineral

River Cobble (likely Metasedimentary or Basalt)

Metamorphosed Siltstone or Altered Fine-grained Igneous Rock

Weathered red-and-green metamorphic rock

Probable epidote-amphibolite or altered schist; exact identification requires testing

Greenstone (or River-tumbled Basalt / Greywacke with Epidote)

Metabasalt / Greenschist facies rock

Granitic Gneiss

Gneiss (High-grade metamorphic rock)

Small weathered rock fragment

Indeterminate; possibly granitic or altered feldspathic material

Pink-and-white quartz-rich pebble

Quartz (SiO₂), likely massive quartz with iron-oxide staining and possible feldspar inclusions

Greenstone (Epidosite or Serpentinite)

Metabasalt / Epidote-Chlorite Schist

Weathered gray-green pebble

Indeterminate; possibly altered basalt, serpentinite, or a greenish metamorphic rock

Tumbled granite (likely granitic gneiss)

Granite; primarily quartz (SiO₂), feldspar, and mica, possibly with metamorphic foliation