Mixed (Predominantly Sedimentary And Igneous)

Jasp-Agate

Cryptocrystalline Quartz (SiO2) with Iron Oxide inclusions

Kaolin (China Clay)

Kaolinite [Al2Si2O5(OH)4]

Graphite

Graphite (Carbon, C)

Mixed collection of minerals and rocks (Jasper, Carnelian, Granite, and Quartz)

Silicon Dioxide (SiO2) with varying impurities for silicates and igneous aggregates

Copper Ore

Cupriferous Rock / Mixed Mineral Matrix

Chakra Stone (Composite / Man-made Bonded Gemstones)

Composite of Quartz, Lapis Lazuli, Aventurine, Tiger's Eye, and Jasper (SiO2, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, etc.)

Quartz with impurities or Host Rock

SiO2 (Silicon Dioxide) with mixed silicates

Amazonite with Smoky Quartz and Feldspar

Microcline (KAlSi3O8) with Quartz (SiO2)

Fancy Jasper

Silicon Dioxide (SiO2) with iron and organic inclusions

Quartz-rich granitic fragment

Granite or granitic pegmatite; chiefly quartz (SiO₂), feldspar, and minor mica

Pink Granite

Intrusive Igneous Rock (high K-feldspar content)

Granite Pebble

Intrusive Igneous Rock (Felsic to Intermediate)

Granite

Felsic intrusive igneous rock

Blue Chalcedony

Silicon Dioxide (SiO2)

Banded Chert / Jasper

Silicon Dioxide (SiO2)

Conglomerate

Sedimentary Conglomerate

Eudialyte

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

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

Hematite

Hematite (Fe2O3)

Pegmatite (Granitic Pegmatite with Quartz, Mica, and Tourmaline/Biotite)

Pegmatite

Mixed rock and mineral collection

Mixed lithologies; likely quartz, feldspar, basalt, granite, chert, sandstone, and metamorphic rocks

Jasper with Quartz

Silicon Dioxide (SiO2) - Chalcedony variety

Opal

Hydrated Silica (SiO2·nH2O)

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

Pegmatite

Igneous Pegmatite (Quartz, Feldspar, Micas)

Pegmatite

Granitic Pegmatite

Schist

Chlorite/Mica Schist

Asphalt Conglomerate

Artificial Bituminous Conglomerate

Carnelian (Carnelian Agate)

Carnelian (Silicon Dioxide - SiO2)

Mixed collection of common river stones

Varied lithologies, visibly including quartz-rich rock, dark mafic rock, sandstone, and purple quartz-bearing material

Banded Amethyst

Silicon Dioxide (SiO2) with iron impurities

Agate (Lake Superior Agate variant)

Chalcedony / Silicon Dioxide (SiO2)

Blue Chalcedony

Silicon Dioxide (SiO2)

Polished granite pebble

Granite; chiefly quartz, feldspar, and mica/amphibole

African Turquoise

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

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