Mixed: Igneous And Sedimentary

Weathered granite fragment

Granite, chiefly quartz, feldspar, and mica

Mixed Gravel and Pebbles

Polylithic Alluvial Aggregate

Pegmatite

Igneous Pegmatite (Quartz, Feldspar, Micas)

Conglomeratic breccia (polymict volcanic breccia)

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

Sodalite and Calcite

Na8(Al6Si6O24)Cl2 (Sodalite) and CaCO3 (Calcite)

Jasper and Basalt (Mixed Breccia or Chert)

Silicon Dioxide (SiO2) with Ferromagnesian silicates

Agate (Lake Superior Agate variant)

Chalcedony / Silicon Dioxide (SiO2)

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

Tumbled black tourmaline (likely schorl)

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

Granite fragment

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

Granite Pebble

Granite

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

Lunar Meteorite

Lunar Feldspathic Breccia

Pink Granite

Phaneritic Quartz-Feldspar Plutonic Rock

African Turquoise

African Turquoise (a trade name for Jasper, a variety of Chalcedony: SiO2)

Tumbled purple-blue corundum, possibly sapphire

Corundum (Al₂O₃); blue-to-purple varieties are sapphire

Rounded porous volcanic rock (likely scoria)

Scoria, vesicular basalt

Pegmatite

Granitic Pegmatite

Jasper-Quartz Conglomerate / Chert

Siliceous Sedimentary Rock (SiO2)

Weathered iron-rich rock, possibly hematite-bearing chert

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

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Quartz-bearing rock fragment

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

Mixed rock and mineral collection

Multiple specimens; visible examples may include quartz (SiO₂), amethyst (quartz), calcite (CaCO₃), and dark mafic rocks

Conglomerate

Polymictic conglomerate, likely carbonate-cemented

Graphite

Graphite (Carbon, C)

Polymict conglomerate (pebble conglomerate)

Clastic sedimentary rock; rounded pebble and granule clasts in a finer-grained matrix

Polished granite pebble

Granite; chiefly quartz, feldspar, and mica/amphibole

Quartz-rich metamorphic rock, likely mica schist

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

Diorite (River Rock/Cobble)

Intermediate Plutonic Igneous Rock (Diorite)

Pink Granite

Granite (Phaneritic Acidic Igneous Rock)

Banded Amethyst

Silicon Dioxide (SiO2) with iron impurities

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)

Pink and Green Tourmaline (Tumbled)

Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)

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)

Sodalite

Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)