Metamorphic Or Igneous Alteration

Carved serpentine wing sculpture

Serpentine-group rock, chiefly antigorite/lizardite: Mg3Si2O5(OH)4

Unakite

Epidotized Granite

Mixed gemstone bead bracelet, likely lava rock and aventurine/jade-look beads

Basaltic scoria (vesicular basalt), plus probable serpentine, aventurine, or dyed quartzite beads

Likely tumbled pale-green mineral specimen

Indeterminate; possibly serpentine, calcite, or pale jade/nephrite

Small quartz-rich mineral fragment

Quartz (SiO₂), possibly milky or chalcedonic quartz

Fossilized marine shell fragment

Likely a bivalve or gastropod shell preserved as calcite (CaCO₃)

Serpentine

Serpentine Group Minerals (e.g., Antigorite, Chrysotile, Lizardite)

Weathered dark volcanic rock, likely basalt

Basalt; predominantly plagioclase feldspar and pyroxene, with possible olivine and secondary alteration minerals

Weathered basaltic rock fragment

Basalt, likely porphyritic or amygdaloidal basalt with weathered iron-oxide-rich zones

Muscovite Mica

KAl2(AlSi3O10)(OH)2

Blue Apatite

Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)

Polished serpentine-rich stone (likely bowenite or serpentine jasper)

Serpentine-group minerals, chiefly antigorite/lizardite; possibly mixed with talc, magnetite, and iron oxides

Serpentine (polished/tumbled)

Serpentine-group minerals, chiefly antigorite, Mg₃Si₂O₅(OH)₄

Greenstone pebble, likely altered basalt

Metabasalt/greenstone; commonly chlorite–epidote–actinolite with albite and iron oxides

Likely serpentinized ultramafic rock (serpentinite)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, possibly with magnetite, chromite, and brucite

Unakite-like granitic pebble

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

Likely weathered basalt or andesite fragment

Fine-grained volcanic rock, likely basaltic-andesite; exact identification requires testing

Weathered porphyritic volcanic rock

Likely altered andesite or rhyolite porphyry

Gold (Processed)

Gold (Au)

Magnetite Ore

Magnetite (Fe3O4)

Talc

Talc (Mg₃Si₄O₁₀(OH)₂)

Serpentine

Serpentinite (a rock composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite; general formula (Mg, Fe)3Si2O5(OH)4)

Weathered porphyritic volcanic rock, likely andesite

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

Polished river stone, likely serpentinite or altered ultramafic rock

Serpentinite-dominant rock; chiefly serpentine-group minerals, commonly with magnetite, talc, and carbonate

Unakite

Altered Granite (composed of orthoclase feldspar, epidote, and quartz)

Tiger’s-eye bead bracelet

Chatoyant quartz, principally quartz (SiO₂) with pseudomorphic fibrous crocidolite/goethite inclusions

Weathered basaltic rock

Basalt, likely amygdaloidal or altered basalt (plagioclase–pyroxene ± olivine)

Copper-bearing porphyritic rock (likely bornite/chalcopyrite ore)

Altered porphyritic volcanic rock with copper sulfides, chiefly bornite (Cu₅FeS₄) and/or chalcopyrite (CuFeS₂)

Vesicular basalt (scoriaceous volcanic rock)

Basalt, chiefly plagioclase, pyroxene, and commonly olivine; vesicles may be lined with secondary minerals

Tumbled gray stone, likely serpentinite or weathered basalt

Tentatively serpentinite (predominantly serpentine-group minerals); identification is uncertain from the photograph

Tumbled serpentine-rich stone (likely serpentinite)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, chlorite, and carbonate

Weathered mica-rich metamorphic rock

Probable biotite schist or mica schist

Polished orbicular jasper

Orbicular jasper; microcrystalline quartz (SiO₂) with iron oxides and altered volcanic minerals

Vesicular quartz-rich rock, possibly weathered rhyolite or silicified volcanic breccia

Silica-rich volcanic rock; likely microcrystalline quartz (SiO₂) with altered feldspar and iron-oxide staining

Basalt with Alteration Crust

Basalt (SiO2 range 45-52%)

Serpentinite with carbonate veins

Serpentinite; chiefly serpentine-group minerals (antigorite/lizardite, Mg₃Si₂O₅(OH)₄) with white calcite or magnesite veins

Unakite

Unakite Lepidolite

Serpentine Schist with Quartz Vein

Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).

Tumbled yellow quartz (likely citrine or iron-stained quartz)

Quartz, SiO₂; yellow color from trace iron or irradiation/heat-related coloration

Quartz-veined breccia

Hydrothermal quartz–carbonate breccia; chiefly SiO₂ quartz with calcite/dolomite and altered host rock

Yellow-green serpentine (likely serpentinite)

Serpentine-group minerals, chiefly antigorite/lizardite: Mg₃Si₂O₅(OH)₄

Weathered basalt cobble

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