Mixed (Predominantly Sedimentary And Igneous)

Weathered vesicular basalt (possible scoria)

Basalt, predominantly plagioclase and pyroxene with possible olivine; iron-oxide weathering

Pink Opal

Hydrated Silica (SiO2·nH2O) with Palygorskite/Sepiolite inclusions

Mixed gemstone bead strand, likely amethyst and assorted colored stones

Likely purple quartz (amethyst, SiO₂) mixed with unidentified green, orange, and reddish beads

Yellow-brown jasper or silicified volcanic rock

Microcrystalline quartz (chalcedony), SiO₂, likely jasper

Pyrope Garnet

Magnesium aluminum silicate (Mg3Al2Si3O12)

Amazonite

Potassium Feldspar (KAlSi3O8)

Tumbled pastel gemstone bead strand

Likely dyed or heat-treated quartz/chalcedony varieties, possibly rose quartz, amethyst, and agate

Sandstone (Banded)

Sedimentary Clastic Rock

Pink Granite

Felsic Intrusive Igneous Rock

Moss Agate Sphere

Silicon Dioxide (SiO2) with inclusions

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Sandstone Pebble

Sandstone (Quartzose/Feldspathic Sandstone)

Citrine

Silicon Dioxide (SiO2) with iron impurities

Tumbled green jasper (probable serpentine-rich stone)

Jasper, microcrystalline quartz (SiO₂), possibly mixed with serpentine or chlorite

Possibly iron-stained quartz or chalcedony

Quartz/chalcedony (SiO₂), identification uncertain from the image

Milky Quartz with Nephrite Jade

Silicon Dioxide (SiO2) with Ca2(Mg,Fe)5Si8O22(OH)2

Vesicular basalt (weathered volcanic scoria)

Basalt, predominantly plagioclase feldspar and clinopyroxene with possible olivine; vesicular texture

Belemnoit Fossil (Thunderstick)

Belemnitida (Internal rostrum)

Iron-rich ochre (red/brown hematite pigment)

Hematite, Fe₂O₃, likely mixed with clay and quartz grains

Botryoidal limonite/goethite nodule

Limonite (largely goethite, FeO(OH), with hydrated iron oxides)

Jasper (Yellow/Brown variety)

Silicon Dioxide (SiO2) with iron oxide impurities

Banded Agate (Onyx type)

Silicon Dioxide (SiO2)

Turquoise (likely stabilized or simulated Howlite)

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

Granite

Granite (composed of quartz, potassium feldspar, plagioclase, and mica/biotite)

Amethyst

Silicon dioxide (SiO2) with iron impurities

Citrine

Silicon Dioxide (SiO2) with iron impurities

Magnetite-rich black sand

Magnetite (Fe₃O₄), likely mixed with other heavy minerals

Weathered fossiliferous limestone

Calcitic limestone; predominantly CaCO₃, possibly containing a fossil mold or shell fragment

Metallic sulfide mineral specimen, likely pyrite

Pyrite (FeS₂), possibly mixed with marcasite or another iron sulfide

Pyrite-bearing sulfide ore (likely pyrite with iron oxides)

Pyrite, FeS₂, possibly mixed with limonite/goethite and other sulfides

Eclipse Stone (Kabamba Jasper)

Rhyolite with Aegirine (NaFe3+Si2O6)

Labradorite

Labradorite (Ca,Na)(Al,Si)4O8

Blue Lace Agate

Cryptocrystalline Quartz (SiO2)

Sandstone

Sedimentary Rock (Quartzose Sandstone)

Jasper

Microcrystalline Quartz (SiO2)

Quartz Geode

Silicon Dioxide (SiO2) in a sedimentary or volcanic host

Sandstone with Lichen and Iron Oxide Staining

Quartz Arenite / Sandstone

Ironstone Concretion (Moqui Marble)

Iron Oxide Concretion (Goethite and Hematite around a Sandstone core)

Sandstone Cobble

Arenite (predominantly Quartz Sandstone)

Orbicular Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Sandstone

Sandstone (Siliciclastic Sedimentary Rock)