Mixed (Predominantly Sedimentary And Igneous)

Pyrite

Iron Sulfide (FeS2)

Graphite

Graphite (Native Carbon, C)

Amazonite (Microcline Feldspar)

KAlSi3O8 (Potassium Aluminum Silicate)

Granite Pebble

Intrusive Igneous Rock (Felsic to Intermediate)

Agate (Lake Superior Agate variant)

Chalcedony / Silicon Dioxide (SiO2)

Conglomerate (pebble-to-cobble gravel)

Polymictic conglomerate; clast-supported conglomerate in a sandy or silty matrix

Quartz and Mixed Sedimentary Rocks

Silicon Dioxide (SiO2) mixed with various clastic sedimentary lithologies

Dalmatian Jasper (Dalmatian Stone)

Dalmatian Stone (primarily Feldspar, Quartz, and Arfvedsonite/Tourmaline)

Concrete Paver (Artificial Cementitious Rock)

Hydrated Portland Cement Aggregate

Dalmation Stone (Dalmation Jasper)

Peralkaline rock (primarily Feldspar and Quartz with Arfvedsonite spots)

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

Dalmatian Stone (often called Dalmatian Jasper)

Peralkaline Quartz-Feldspar Rock with Arfvedsonite (formerly believed to be Jasper)

Hematite

Hematite (Fe2O3)

Diorite

Intermediate Phaneritic Igneous Rock

Eudialyte

Eudialyte (Na4(Ca,Ce)2(Fe2+,Mn,Y)ZrSi8O22(OH,Cl)2)

Tumbled granite or granitic gneiss

Granite, primarily quartz, alkali feldspar, plagioclase, and dark biotite/amphibole

Weathered quartz-rich rock, possibly granite or granitic pegmatite

Indeterminate quartz–feldspar aggregate; likely granite/pegmatite

Pink granite

Coarse-grained granitic rock, chiefly orthoclase microcline feldspar, quartz, and dark biotite/amphibole

Gabbro (Water-worn pebble)

Gabbro

Pegmatite with Lepidolite and Feldspar

Pegmatite (containing K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 and KAlSi3O8)

Pegmatite

Igneous Pegmatite (Quartz, Feldspar, Micas)

Sodalite and Calcite

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

Granite fragment

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

Granite Pebble

Granite

Likely granite

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

Tumbled pink granite

Granite, composed mainly of quartz, potassium feldspar, plagioclase, and dark mica or amphibole

Granite

Coarse-grained granitic rock, primarily quartz, alkali feldspar, plagioclase, and dark biotite/amphibole

Weathered granite fragment

Granite, chiefly quartz, feldspar, and mica

Conglomeratic gravel / lithified alluvial deposit

Polymictic conglomerate or pebble-rich sandstone (likely weakly cemented)

Tumbled purple-blue corundum, possibly sapphire

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

Conglomeratic breccia (polymict volcanic breccia)

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

Tumbled black tourmaline (likely schorl)

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

Mixed polished gemstones and minerals

Likely agate/chalcedony (SiO₂), quartz, jasper, and possibly aventurine or obsidian; exact identification requires individual testing.

Lunar Meteorite

Lunar Feldspathic Breccia

Pink Granite

Phaneritic Quartz-Feldspar Plutonic Rock

Conglomerate

Polymictic conglomerate, likely carbonate-cemented

African Turquoise

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