Sedimentary Rock (Altered)

Iron-rich volcanic rock, possibly hematite-bearing basalt

Basalt with iron oxides/hydroxides, chiefly hematite (Fe₂O₃) and possibly magnetite (Fe₃O₄)

Polished Yellow Jaspar

Chalcedony / Quartz (SiO2 with Iron Oxides)

Jasper

Microcrystalline Quartz (SiO2)

Likely brecciated jasper or iron-stained quartz-rich rock

Jasper-bearing breccia; exact identification requires testing

Weathered limestone or calcareous sandstone

Calcite-rich carbonate rock, likely limestone (CaCO₃), possibly sandy or dolomitic

Blue-green copper mineral rock, likely chrysocolla-bearing matrix

Chrysocolla (hydrated copper aluminosilicate), commonly with malachite, limonite, and quartz

Mica-bearing metamorphic rock, likely schist

Mica schist; likely composed of quartz and mica (muscovite and/or biotite), with possible feldspar

Quartz-rich breccia or quartz vein fragment

Silica, primarily quartz (SiO₂), with possible chlorite, feldspar, or iron-oxide inclusions

Iron-stained quartz-rich rock (possibly weathered quartz vein material)

Quartz-rich, iron-oxide-stained rock; exact lithology cannot be determined from the photograph

Tumbled pink-orange feldspar

Microcline or orthoclase feldspar, KAlSi₃O₈ (tentative)

Green Andesite (or Greenstone / Altered Volcanic Rock)

Intermediate Volcanic Rock with Chlorite/Epidote Alteration

Weathered iron-rich rock (likely basalt or ironstone)

Probable altered basalt; exact identification requires testing

Tumbled copper-bearing rock, likely chrysocolla-bearing basalt or copper ore

Chrysocolla (hydrated copper phyllosilicate, approximately Cu₂H₂Si₂O₅(OH)₄·nH₂O) in a dark volcanic host

Weathered iron-rich basalt or laterite

Basalt, likely limonitized/goethite-stained; exact identification requires testing

Weathered granite (likely biotite granite)

Granite; interlocking quartz, feldspar, and mica, commonly with biotite

Tumbled greenish stone, likely altered basalt or serpentinite

Probable basaltic/mafic rock with secondary chlorite, epidote, or serpentine minerals

Likely bituminous coal or carbon-rich shale fragment

Bituminous coal; predominantly carbon with macerals and minor clay/pyrite

Blue-gray quartz-bearing rock, likely dumortierite quartz or silicified metamorphic rock

Quartz (SiO₂) with probable dumortierite and iron-oxide inclusions

Serpentine-rich metamorphic rock

Serpentinite, likely with quartz or calcite veining and minor magnetite

Serpentine-rich serpentinite

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

Unakite

Unakite (Epidotized Granite)

Weathered granite or granitic gneiss

Quartz–feldspar–biotite granitoid; exact identification requires close examination

Likely fine-grained greenstone

Greenstone, typically metamorphosed mafic volcanic rock (metabasalt; commonly chlorite- and actinolite-bearing)

Rounded greenstone river cobble

Likely serpentinite or chlorite-rich metamorphic rock; exact identification requires testing

Banded Rock (likely Quartz-rich)

Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals

Tumbled serpentine-rich altered rock

Serpentinite, likely antigorite/lizardite with accessory carbonate, quartz, or iron oxides

Copper-bearing altered rock, likely chrysocolla-bearing quartzite or breccia

Quartz (SiO₂) with copper silicate minerals, chiefly chrysocolla [approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O], and iron oxides

Quartz-rich altered rock, possibly quartz vein with mica

Microcrystalline to coarse quartz (SiO₂) with probable muscovite/biotite mica and iron-oxide staining

Weathered volcanic rock, likely altered basalt

Basaltic rock, probably chlorite–epidote–iron-oxide altered basalt

Chrysoprase-bearing quartz matrix (probable)

Nickeliferous chalcedony/quartz, SiO₂, with green nickel minerals such as garnierite or népouite

Tumbled granite

Granite, chiefly quartz, feldspar, and mica

Tumbled greenstone/serpentine pebble

Serpentinite, chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), possibly with chlorite or talc

Quartz-rich hydrothermal vein rock

Milky quartz with iron-oxide staining, possibly quartzite or silicified host rock (SiO₂)

Amethyst-bearing quartz fragment

Quartz, SiO₂, with purple amethyst coloration; likely attached to a green matrix mineral

Weathered granitic or gneissic pebble

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

Unakite

Altered Granite (Orthoclase + Epidote + Quartz)

Tumbled green stone, possibly serpentine

Likely serpentine-group rock (mainly serpentine minerals; identification uncertain from the image)

Amber-colored bead earrings

Likely amber (fossilized tree resin); material cannot be confirmed from the image

Serpentine-rich rock, possibly chrysotile serpentine

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

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Tumbled granite (likely granitic gneiss)

Granite; primarily quartz (SiO₂), feldspar, and mica, possibly with metamorphic foliation

Jasper

Silicon dioxide with impurities (microcrystalline quartz)