Sedimentary Rock (Altered)

Rounded green-gray river cobble

Likely altered basalt or andesite; exact identification requires a fresh surface and tests

Orbicular jasper / brecciated jasper

Silica-rich microcrystalline quartz (chalcedony), commonly with iron oxides and altered volcanic fragments

Orange calcite

Calcite (CaCO₃), likely a botryoidal or rough aggregate

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Tumbled green jasper or serpentine

Likely serpentine-group mineral, chiefly magnesium silicate; possibly epidotized or altered jasper

Rhodonite

Rhodonite (MnSiO3)

Unakite (or Epidotized Granite)

Epidotized Granite (Composition: KAlSi3O8, Ca2(Al,Fe)3(SiO4)3(OH), SiO2)

Serpentinite (serpentine-rich metamorphic rock)

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

Weathered gray-green metamorphic pebble

Probable greenschist or chlorite-rich metavolcanic rock; exact identification requires testing

Turquoise

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

Weathered basalt (possibly iron-stained volcanic rock)

Basalt; predominantly plagioclase, pyroxene, and possibly olivine, with iron-oxide staining

Pale green tumbled mineral fragment, likely serpentine or green calcite

Probable serpentine-group mineral (Mg3Si2O5(OH)4) or, less likely, calcite (CaCO3); identification is uncertain from the photograph

Greenstone / serpentinized ultramafic rock (probable)

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

Tumbled granite or granitic gneiss

Quartz–feldspar–mica granitoid; likely biotite granite, possibly foliated gneiss

Jasper Pebble

Microcrystalline Quartz (Chalcedony), SiO2

Unakite

Epidote–pink feldspar–quartz rock

Serpentinite (serpentinized ultramafic rock)

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

Turquoise fragment

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Turquoise

Hydrous phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O

Red jasper (likely brecciated or iron-stained jasper)

Jasper, microcrystalline quartz (SiO₂), colored chiefly by iron oxides

Lapis Lazuli

Lazurite-dominant rock, (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2

Limonitic ironstone / weathered iron-rich rock

Goethite–limonite aggregate; principally FeO(OH)·nH₂O with possible hematite (Fe₂O₃)

Polished ocean jasper / brecciated jasper

Jasper, microcrystalline quartz (SiO₂), with iron-oxide and other silicate inclusions

Polished orbicular jasper

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

Weathered basalt (likely)

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

Gabbroic rock, possibly hornblende gabbro

Gabbro; coarse-grained mafic silicate rock dominated by plagioclase and pyroxene, with possible hornblende and magnetite

Grass (Organic Matter/Soil)

Poaceae (family of monocotyledonous flowering plants)

Tumbled serpentine-rich rock

Serpentinite, likely antigorite/lizardite with magnetite and minor carbonates

Quartz-rich granite or granitic pegmatite cobble

Granite/pegmatite, chiefly quartz (SiO₂) with feldspar and minor iron-oxide staining

Serpentinite with carbonate and iron-oxide alteration

Serpentinite; chiefly antigorite/lizardite Mg₃Si₂O₅(OH)₄, with magnetite, calcite, and chromian minerals

Weathered granitic rock (likely granite or granodiorite)

Granite–granodiorite; quartz + feldspar + dark mica/amphibole

Aura Quartz Geode

Titanium/Gold bonded Quartz (SiO2 with metallic coating)

Serpentinite (serpentinized ultramafic rock)

Serpentine-group minerals, chiefly lizardite and antigorite; commonly derived from peridotite

Polished Ocean Jasper (likely)

Silicified orbicular rhyolite; primarily microcrystalline quartz (SiO₂)

Copper-bearing rock, likely bornite/chalcopyrite ore in quartz matrix

Bornite (Cu₅FeS₄) and/or chalcopyrite (CuFeS₂), with quartz (SiO₂) and dark gangue minerals

Weathered basalt or mafic metavolcanic rock

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

Quartzite

Metamorphic Quartzite (SiO2)

Blue-green turquoise (probable)

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Weathered granite or granitic gneiss slab

Granitic rock, chiefly quartz, feldspar, and mica; exact identification is uncertain from the photograph

Serpentine-rich metamorphic rock (possibly serpentinite)

Serpentinite; chiefly antigorite, lizardite, or chrysotile with possible magnetite and carbonate 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

Lapis Lazuli (Low-grade)

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