Sedimentary Rock (Altered)

Unakite (Tumbled)

Unakite (altered granite)

Weathered basalt or iron-rich volcanic rock

Mafic volcanic rock, likely basalt; exact identification requires testing

Brown sandstone or weathered quartz-rich rock

Likely lithic sandstone; exact identification requires a close fresh surface and tests

Serpentine

Serpentine group (Mg,Fe)3Si2O5(OH)4

Chrysocolla in Matrix

Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O

Unakite

Altered Granite (Epidotized Granite)

Weathered limestone

Calcite-rich carbonate rock (mostly CaCO₃), possibly fossiliferous limestone

Greenish altered rock, possibly serpentinite or chlorite-rich schist

Tentative: serpentine-group minerals, chiefly antigorite/lizardite, or chlorite–actinolite assemblage

Turquoise

Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O

Unakite / Feldspar Veined Metamorphic Pebble

Metamorphic Rock with K-Feldspar, Epidote, and Quartz

Tumbled greenstone (likely serpentine-rich)

Greenstone; commonly metamorphosed mafic rock composed of actinolite/chlorite with epidote and albite

Greenstone (likely altered basalt)

Chlorite- and epidote-altered mafic volcanic rock; commonly called greenschist or greenstone

Greenstone (likely chlorite schist)

Chlorite-rich metamafic rock; commonly chlorite + actinolite/epidote with quartz and feldspar

Likely serpentine-rich pebble

Serpentinite, composed mainly of serpentine-group minerals (e.g., antigorite, lizardite, or chrysotile)

Weathered iron-rich limestone or altered volcanic rock

Probable limonite/goethite-bearing calcite rock; exact identification requires testing

Mixed tumbled river pebbles and beach stones

Polymictic alluvial gravel; components include quartz, chert, jasper, sandstone, and altered volcanic rocks

Unakite

Altered Granite (Epidotized Granite)

Labradorite-bearing gneiss or altered feldspathic rock

Plagioclase-rich gneiss, locally labradorescent; composition likely plagioclase feldspar, quartz, mica, and iron-oxide veining

Likely weathered iron-rich quartz or chert

Microcrystalline quartz (SiO₂), possibly limonite/goethite stained

Beach-worn fossil bone or coral fragment

Indeterminate biogenic calcium-carbonate material; likely fossilized bone (hydroxyapatite) or coral (calcite/aragonite)

Weathered sedimentary cobble, likely limestone or calcareous sandstone

Indeterminate carbonate-rich clastic rock; possibly micritic limestone or calcarenite

Blue-gray quartz-rich rock, possibly blue aventurine or sodalite-bearing stone

Probable quartz–feldspar aggregate; exact identification requires testing

Weathered schist or gneiss boulder

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

Greenstone pebble

Likely chlorite- and/or actinolite-bearing metamorphic rock; exact composition cannot be determined from the image.

Polished jasper pebble

Jasper, microcrystalline quartz (SiO₂) with iron-oxide and clay-mineral impurities

Unakite

Unakite (altered granite)

Greenstone / Basalt with Amygdule

Amygdaloidal Basalt (altered to Greenstone)

Pale greenish quartz-bearing rock, possibly serpentine or altered feldspar

Tentatively serpentinite-related rock (serpentine-group minerals) or altered granitic material; identification is uncertain from the photograph

Granite-like rock

Felsic intrusive igneous rock, probably granitic or granodioritic

Polished/patinated jasper slab

Microcrystalline quartz (SiO₂), commonly chalcedony with iron-oxide and clay inclusions

Tumbled bronzite-bearing stone

Bronzite-rich serpentinite or pyroxenite; exact identification requires testing

Lapis Lazuli

Lapis Lazuli (Metamorphic Rock containing Lazurite, Calcite, Pyrite, and Sodalite)

Weathered quartz-rich rock, likely arkose or quartzite

Quartz-dominant siliciclastic rock; probable arkose (quartz + feldspar), possibly weakly metamorphosed quartzite

Weathered polymictic conglomerate or breccia

Polymictic conglomerate/breccia, likely iron-stained and quartz-bearing

Quartz and Unakite

SiO2 (Quartz) / Epidote, Pink Orthoclase, Quartz (Unakite)

Banded limestone or marble pebble

Calcite-rich carbonate rock; likely banded marble (CaCO₃)

Weathered iron-rich rock, possibly banded iron formation

Hematite–goethite-rich ironstone; possible BIF (Fe₂O₃/FeO(OH) with quartz)

Greenstone pebble (identification uncertain from photo)

Greenstone, typically metamorphosed mafic rock composed of chlorite, actinolite, and epidote

Greenish metamorphic rock (possibly chlorite schist)

Chlorite-rich schist; exact identification is uncertain from the image

Dark pebble with pale mineral patches

Likely porphyritic basalt or andesite; identification is uncertain from the photograph

Likely iron-rich metamorphic rock (possibly hematite-rich ironstone)

Unidentified ferruginous rock; exact mineralogy cannot be determined from the image

Weathered golden-brown mineral/rock fragment

Indeterminate from image; possibly iron-stained quartz, feldspar, or a sulfide-bearing rock