Metamorphic (Altered Igneous Rock)

Weathered porphyritic volcanic rock, likely andesite

Porphyritic andesite (tentative; plagioclase ± pyroxene/amphibole in a fine groundmass)

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

Metabasalt / Greenschist facies rock

Unakite (likely epidote–feldspar rock)

Epidote–K-feldspar–quartz aggregate; commonly approximated as pink orthoclase/microcline + green epidote + quartz

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

Altered mafic rock or Epidosite

Granitic Gneiss

Gneiss (High-grade metamorphic rock)

Lapis Lazuli (Low-grade)

Lapis Lazuli (Aggregate of Lazurite, Calcite, and Pyrite)

Conical fossil shell or shell fragment

Likely a gastropod shell fragment; exact taxon indeterminate from the image

Chakra Stone Bracelet

Mixed Mineral Assembly (Scoria, Amethyst, Lapis Lazuli, Turquoise/Howlite, Impression Jasper, Tiger's Eye, Carnelian, Red Jasper)

Small rounded pebble, likely quartz-rich river stone

Indeterminate; likely quartz/chert-bearing lithic clast

Likely weathered brown quartz-bearing rock

Tentatively weathered granite or granitic gneiss; exact identification is uncertain from the photograph

Green-and-gold apatite-bearing rock, possibly epidote skarn

Apatite-group mineral, commonly fluorapatite (Ca₅(PO₄)₃F), with probable epidote and quartz; exact identification requires testing

Unakite

Unakite (Altered Granite)

Epidosite

Epidosite (composed primarily of Epidote and Quartz)

Tumbled reddish-brown basalt or andesite cobble

Fine-grained mafic to intermediate volcanic rock; commonly plagioclase, pyroxene, and magnetite, with iron-oxide staining

Likely basalt (possibly weathered volcanic rock)

Basalt; predominantly plagioclase feldspar and pyroxene, with possible olivine and iron oxides

Epidote

Epidote Group (e.g., Clinozoisite, Epidote, Piemontite), Epidote formula: Ca2(Al,Fe)3(SiO4)3(OH)

Quartz with inclusions (likely Chlorite or Hornblende) and country rock

SiO2 (Quartz) with associated ferromagnesian minerals

Polished pegmatitic granite (likely graphic granite)

Coarse-grained granitic rock composed chiefly of quartz, feldspar, and biotite/hornblende

Unakite

Unakite (altered granite)

Epidote or Unakite Rock

Epidote-bearing rock / Ca2(Al,Fe)3(SiO4)3(OH)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Lapis Lazuli

Lapis Lazuli (Metamorphic rock primarily composed of Lazurite, Calcite, and Pyrite)

Porphyritic volcanic rock (likely andesite or basaltic andesite)

Porphyritic andesite/basaltic andesite; mainly plagioclase, pyroxene, and possibly olivine in a fine volcanic groundmass

Dark gray volcanic rock, probably andesite or basalt

Fine-grained mafic–intermediate volcanic rock; likely basalt (plagioclase ± pyroxene), possibly andesite

Blue Apatite

Fluorapatite / Apatite Group (Ca5(PO4)3(F,Cl,OH))

Unakite (Tumbled)

Unakite (altered granite)

River Cobble (likely Metasedimentary or Basalt)

Metamorphosed Siltstone or Altered Fine-grained Igneous Rock

Black Tourmaline (Schorl)

NaFe3+3Al6(BO3)3Si6O18(OH)4

Weathered quartz-bearing metamorphic rock, likely gneiss or schist

Quartz–feldspar–mica rock; exact classification is uncertain from the photograph

Unakite

Unakite (altered granite containing Epidote, Orthoclase, and Quartz)

River Pebble (Granite/Gneiss)

Granitic Pebble (Quartz, Feldspar, Mica composition)

Quartz Vein in Greenstone

Metamorphic rock with quartz vein (SiO2 / mixed silicates)

Weathered gray-green pebble

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

Granite or granitic rock fragment

Coarse-grained felsic intrusive rock, chiefly quartz, feldspar, and mica/amphibole

Milky quartz-rich rock

Quartz (silicon dioxide, SiO₂), likely with mica or feldspar inclusions

Epidote

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

Weathered basalt or mafic metavolcanic rock

Basalt, possibly altered to greenstone (chlorite–epidote–actinolite assemblage)

Unakite

Unakite (altered granite)

Weathered granitic or gneissic pebble

Granite–gneiss assemblage; quartz + feldspar + dark mafic minerals

Weathered schist or gneiss boulder

Micaceous quartz-feldspar schist/gneiss; exact identification is limited by the photograph

Epidote (Unakite variety)

Epidosite (Metasomatic rock containing Ca2(Al,Fe)3(SiO4)3(OH))

Altered volcanic rock, possibly andesite

Likely porphyritic andesite or dacite with secondary chlorite/epidote and quartz–calcite veins