Sedimentary Rock (Altered)

Tumbled yellow-green stone, possibly serpentine

Serpentine-group minerals, commonly antigorite or lizardite; identification from the image is uncertain

Polished ocean jasper (orbicular jasper)

Silicified volcanic rock; chiefly microcrystalline quartz/chalcedony (SiO₂), with iron oxides and other alteration minerals

Rounded basalt cobble

Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine

Unakite-like granitic pebble

Altered granite composed mainly of quartz, feldspar, and epidote; red areas may be potassium feldspar or iron-stained feldspar

Tumbled serpentine

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

Greenstone

Metamorphosed Mafic Igneous Rock

Epidotite (Unakite-related Epidote)

Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Erythrite on Matrix

Cobalt Bloom (Co3(AsO4)2·8H2O)

Weathered granitic rock

Granite or granodiorite; chiefly quartz, feldspar, and mica/amphibole

Weathered pegmatitic granite or feldspar-rich metamorphic rock

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

Jasper

Microcrystalline Quartz (SiO2)

Tumbled serpentine (likely green serpentinite)

Serpentine-group minerals, commonly antigorite, lizardite, or chrysotile; serpentinite is the rock

Lapis Lazuli

Lazurite-rich metamorphic rock

Weathered quartz-rich rock, possibly quartzite or granite fragment

Quartzite (SiO₂-dominant) or altered granitoid; uncertain from image

Weathered quartz-rich pebble, possibly granite or pegmatite

Quartz (SiO₂) with probable feldspar and minor mica/iron-oxide inclusions

Unakite

Altered granite (Epidotized granite)

Pale blue-gray chalcedony (probable)

Microcrystalline quartz, SiO₂; possibly common chalcedony or quartz-rich volcanic rock

Serpentine-rich greenstone (probable serpentinized ultramafic rock)

Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), commonly with magnetite, chromite, and relict olivine/pyroxene

Tumbled blue-gray stone, likely basalt or slate

Probable fine-grained basalt; exact identification is uncertain from the photograph

Small yellow mineral specimen, possibly sulfur

Unidentified; native sulfur (S) is a possibility

Green-and-black mottled metamorphic rock (likely serpentinite)

Serpentinite, composed mainly of serpentine-group minerals (e.g., antigorite or lizardite); identification from the photo is provisional.

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in Altered Host Rock

Unakite (likely)

Epidote–feldspar–quartz rock, commonly called unakite; composition is uncertain from the photo.

Fuchsite or Green Mica Schist

Muscovite variant (KAl2(AlSi3O10)(OH)2 with Cr)

Unidentified gray-green rock, possibly serpentinite or altered basalt

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

Polished pink feldspar-rich rock, possibly unakite

Likely unakite (epidote, pink potassium feldspar, and quartz); identification is uncertain from the photo

Greenstone / altered basalt fragment

Likely chlorite–epidote–actinolite altered basalt; exact identification requires testing

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Dark gray fine-grained stone, likely basalt or andesite

Basalt–andesite volcanic rock; commonly composed of plagioclase, pyroxene, and possibly olivine or magnetite

Peridotite

Ultramafic igneous rock

Milky quartz vein rock

Quartz (SiO₂), likely in a quartz-rich host rock with minor iron-stained minerals

Likely serpentinite (serpentine-rich rock)

Serpentinite, composed mainly of serpentine-group minerals (lizardite, antigorite, or chrysotile); identification from the photo is tentative.

Weathered rhyolite or volcanic tuff

Silica-rich extrusive igneous rock, likely rhyolite; exact identification requires testing

Brecciated serpentinite

Serpentinite breccia, composed mainly of serpentine-group minerals (e.g., lizardite, antigorite, chrysotile) with pale carbonate or quartz-rich veins

Greenstone pebble

Greenstone, typically metamorphosed basalt or andesite; often contains chlorite, epidote, and actinolite

Weathered quartz-bearing rock, possibly granite or pegmatite

Likely quartz–feldspar rock; exact mineral identification is uncertain from the photograph

Small banded metamorphic rock fragment

Indeterminate foliated metamorphic rock; possibly mica schist or gneiss

Weathered iron-rich quartz vein in altered host rock

Goethite–hematite limonite with quartz and iron-oxide alteration

Epidosite with Quartz (Unakite-variant or Jasper)

Epidotized Metasomatite

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Unakite / Red Jasper beach pebble

Altered Granite (Epidotized Feldspar and Quartz)

Weathered greenish-gray rock fragment

Tentatively basaltic or mafic metamorphic rock; exact identification is uncertain from the photograph