Sedimentary And Igneous (Mixed)

Conglomerate

Polymictic conglomerate, likely carbonate-cemented

Conglomeratic breccia (polymict volcanic breccia)

Polymict volcaniclastic breccia; clasts likely basaltic/andesitic rock in a dark matrix

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

Banded Amethyst

Silicon Dioxide (SiO2) with iron impurities

Quartz-rich metamorphic rock, likely mica schist

Mica schist; chiefly quartz (SiO₂) and mica, likely muscovite/biotite, with possible feldspar

Quartz-bearing feldspar pegmatite (likely with mica/tourmaline)

Granitic pegmatite; chiefly quartz (SiO₂) and feldspar, with dark mica or tourmaline

Granite pebble

Granite; primarily quartz, alkali feldspar, plagioclase, and dark mica/amphibole

Polished/rounded granite cobble

Granite, chiefly quartz (SiO₂), feldspar, and mica/amphibole

Polymictic conglomerate

Conglomerate; clast-supported polymictic conglomerate in a dark matrix

Rounded river pebble

Likely lithic sandstone or weathered quartz-rich rock; exact identification requires testing

Conglomeratic breccia

Clast-supported polymictic conglomerate/breccia, cemented by silica- or carbonate-rich matrix

Mixed river gravel (alluvial conglomeratic sediment)

Polymictic alluvium; composition includes quartz, feldspar, chert, granite, basalt, and metamorphic rock fragments

Bauxite

Aluminium ore (Hydrated aluminium oxides AlOx(OH)3-2x)

Sandstone with Desert Varnish

Arenite with Ferromanganese patina

Jasper-Quartz Conglomerate / Chert

Siliceous Sedimentary Rock (SiO2)

Sodalite

Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)

Mixed Mineral Bead Bracelet

Polycrystalline and Monocrystalline Silicates/Oxides (Quartz, Howlite, Hematite)

Quartz-bearing rock fragment

Likely milky quartz with iron-oxide staining and possible host-rock minerals; exact identification is uncertain from the image.

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Likely biotite-rich schist

Mica schist, probably containing biotite and quartz (exact identification requires testing)

Tumbled black tourmaline (likely schorl)

Schorl, sodium–iron tourmaline: NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Mixed Gemstones and Minerals

Mixed Silicates and Oxides (Quartz/Amethyst, Aventurine, Sodalite, Chert, Jasper)

Carnelian and Mixed Agates

Cryptocrystalline Quartz (SiO2 with Iron Oxide impurities)

River gravel and cobbles

Mixed alluvial clasts, likely including granite, basalt, quartzite, and sandstone

Mixed River Pebbles

Polymictic quartz and silicate pebble aggregate

Mixed River Pebbles

Polylithic rock fragments

Mixed rounded gravel

Unsorted polymictic gravel; individual clasts likely include quartz, granite, gneiss, and other common rocks

Quartz-rich granite (likely weathered granite)

Granite, a coarse-grained felsic intrusive igneous rock, composed chiefly of quartz and feldspar with minor mica

Granite pebble

Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica

Gray granite or granitic gneiss gravel

Granite; primarily quartz, feldspar, and mica (exact identification is uncertain from the photograph)

Granodiorite

Granodiorite (intermediate intrusive igneous rock containing plagioclase, quartz, and K-feldspar)

Quartz-rich rock fragment

Likely milky quartz with feldspar and possible mica; exact rock type is indeterminate from the image

Granite or Granitoid River Rock

Granite

Granite Pegmatite

Pegmatite (Quartz, Feldspar, Mica)

Ironstone Pebble

Ferruginous sedimentary rock (Fe2O3 / FeO(OH) mixed with SiO2)

Conglomerate

Conglomerate (clastic sedimentary rock)

Graphite

Graphite (Carbon, C)

Weathered iron-rich rock, possibly hematite-bearing chert

Hematite (Fe₂O₃), likely mixed with silica and iron oxides

Unidentified coarse-grained rock fragments

Likely granite or granitic rock; exact identification is uncertain from the photograph

Feldspar (Granite Pegmatite matrix)

Potassium Feldspar (KAlSi3O8) / Quartz Mixture

Mixed River Stones and Agates

Mixed Silicates and Ironstones (primarily SiO2 and Fe2O3)

Conglomerate

Conglomerate (Clastic sedimentary rock)