Sedimentary And Igneous (Mixed)

Iron-rich concretion or weathered limonite/goethite nodule

Limonite (hydrous iron oxides), commonly dominated by goethite (FeO(OH))

Fossiliferous limestone with silicified fossil material

Bioclastic limestone; likely marine mollusk/coral fragments, locally replaced by chalcedony or calcite

Mineral and Rock Collection (Assorted)

Mixed collection including Quartz (SiO2), Jasper (SiO2 with impurities), Rose Quartz, and Aventurine

Mixed collection of quartz-rich rocks and minerals

Quartz (SiO₂), with some pieces possibly containing feldspar or mica; exact identification is uncertain from the image

Granite or Pegmatite with Quartz and Feldspar

Granitoid

Gneiss

Gneiss (High-grade metamorphic rock composed primarily of Quartz, Feldspar, and various Micas)

Red Granite

Granite

Quartz with Mica inclusions (Pegmatite)

Silicon Dioxide (SiO2) with Muscovite/Biotite inclusions

Jasper and Quartz Breccia

Silica breccia (SiO2)

Weathered quartz-rich pebble

Likely quartz-rich granitoid (quartz and feldspar); exact identification is uncertain from the image

Weathered conglomeratic volcanic rock

Likely basaltic volcanic breccia or agglomerate, with plagioclase, pyroxene, volcanic glass, and lithic fragments

Mixed stone-bead bracelet, likely agate/jasper and possibly sodalite or dyed quartz

Primarily microcrystalline quartz (SiO₂) varieties, with opaque iron-rich chalcedony/jasper and probable blue sodalite or dyed material

Hematite cameo or hematine imitation

Hematite (Fe₂O₃); possibly synthetic hematine or black glass

Beach Pebbles and Jasper

Quartz / Microcrystalline Silicon Dioxide (SiO2)

Weathered granitic rock fragment

Likely granite or granodiorite, composed mainly of quartz, feldspar, and mica

Mixed mineral and rock specimen collection

Mixed assemblage, visibly including quartz, chalcedony/agate, feldspar, mica, dark mafic rocks, and possibly calcite or gypsum

Gabbro

Mafic intrusive igneous rock

Mixed Pebbles

Polylithic Rock Fragments

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

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

Mixed river stones and gravel

Polymictic alluvial clasts; individual pieces may include quartzite, granite, basalt, sandstone, limestone, and slate

Concrete fragment with Aggregate

Anthropogenic Concrete with Calcarious and Siliceous Aggregate

Assorted rock and mineral specimens

Multiple unidentified specimens; individual mineral and rock names cannot be determined from this image

Pink Granite

Granite (Felsic Plutonic Rock)

Unidentified polished stone fragments

Indeterminate; likely mixed lapidary specimens, possibly jasper, agate, or quartz-bearing rock

Mixed Mineral Collection (Quartz, Amethyst, Rose Quartz, Pyrite, etc.)

Mixed Silicates and Sulfides (SiO2, FeS2)

Soil with Mineral Detritus and Quartz Fragments

Regolith / Silicate Mineral Aggregate

Mahogany Obsidian

Volcanic Glass with Hematite/Magnetite inclusions (SiO2 + Fe2O3)

Unidentified gravel and stone fragments

Mixed, indeterminate lithologies; likely quartz, feldspar, and weathered silicate rock fragments

Conglomeratic sandstone or breccia specimen

Quartz-rich clastic sedimentary rock; likely sandstone with pebble-sized quartz, feldspar, and lithic clasts

Mixed tumbled gravel and quartz-rich sandstone

Primarily quartz (SiO₂), feldspar, and lithic sedimentary fragments; one piece appears to be quartz-rich sandstone

Sodalite

Na4Al3(SiO4)3Cl (Sodium Aluminum Silicate Chloride)

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

Polished Jasper Cabochons

Microcrystalline quartz (SiO2)

Mixed sedimentary rock and mineral specimens

Predominantly limestone, chert, sandstone, and iron-oxide-bearing clasts; exact identification requires testing

Quartz and Mixed Sedimentary Rocks

Silicon Dioxide (SiO2) mixed with various clastic sedimentary lithologies

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Road-surface aggregate (crushed stone)

Unidentifiable mixed lithic aggregate; likely basaltic/andesitic fragments with feldspar, quartz, and weathered rock

River Pebble

Quartzite or mixed lithology rock

Landscape Pebbles

Mixed Quartz and Limestone Gravel

River Pebble

Polished Quartzite or Mixed Lithology

Tumbled feldspar-rich granite

Granite, composed mainly of quartz and feldspar with dark biotite or amphibole