Mixed: Igneous And Sedimentary

Assorted Tumbled Gemstones

Mixed oxides and silicates (including Quartz, Chalcedony, and Feldspar variants)

Dark gray weathered pebble, likely basalt

Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides

Silver-colored mica schist

Muscovite–quartz schist, possibly with biotite

River Pebbles (including Granite and Basalt)

Mixed Igneous Rocks (Granite, Basalt)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Mixed River Pebbles (including Unakite and Jasper)

Polymineralic geological specimens

Mixed River Stones and Minerals

Mixed Silica-rich Stones (Quartz, Agate, Jasper, Sandstone, Dalmation Stone)

Smoky Quartz with Feldspar

SiO2 (Quartz) with KAlSi3O8 (Feldspar)

Beach Pebbles and Quartz Aggregates

Quartz pebbles and biogenic fragments (SiO2, CaCO3)

Weathered granitic rock fragment

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

Migmatite

Migmatite (Mixed metamorphic-igneous rock)

Granite or Pegmatite with Quartz and Feldspar

Granitoid

Red Jasper with Quartz Veining

Microcrystalline Quartz (SiO2)

Crushed Granite and Quartz Gravel

Composite Igneous and Silicate Rock Aggregate

Mixed polished river stones

Likely quartz, quartzite, chert/jasper, and possibly limestone or marble

Jasper and Quartz Breccia

Silica breccia (SiO2)

Crushed Stone / Gravel

Aggregate (mixed lithology)

Gravel and Sediment Sample

Mixed clastic sediment

Quartz with Mica inclusions (Pegmatite)

Silicon Dioxide (SiO2) with Muscovite/Biotite inclusions

Pink Granite

Granite (Felsic Plutonic Rock)

Mixed gemstone jewelry collection

Various gemstone minerals, including likely amethyst (quartz), sapphire or iolite, garnet, pearl, turquoise, and colored beryl or tourmaline

Gneiss

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

General river rock or weathered cobble

Mixed rock composition

Mixed rock and mineral specimens

Predominantly quartz-rich rocks, with a possible malachite-bearing specimen; exact identification is uncertain from the image

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

Mahogany Obsidian

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

Mixed river stones and gravel

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

Feldspar-Quartz Rock (likely Pegmatite or Granite)

Feldspar-Quartz composite rock (KAlSi3O8 - SiO2)

Granite Pebble

Granite (composed of Quartz, Feldspar, and Mica)

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

Concrete fragment with Aggregate

Anthropogenic Concrete with Calcarious and Siliceous Aggregate

Ptygmatic Migmatite

Migmatite (consisting of Neosome and Paleosome fractions)

Crushed Stone (Gravel/Aggregates)

Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)

Sodalite

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

Soil with Mineral Detritus and Quartz Fragments

Regolith / Silicate Mineral Aggregate

Beach Pebbles and Jasper

Quartz / Microcrystalline Silicon Dioxide (SiO2)

Assorted Decorative Tumbled Stones (Quartz, Sodalite, Aventurine, Calcite)

Mixed Silicates and Carbonates (SiO2, Na8(Al6Si6O24)Cl2, CaCO3)

Concrete Fragment

Artificial Conglomerate (Cement and Aggregate)

Asphalt (Bituminous Rock)

Natural bitumen or Bituminous limestone/sandstone

Smoky Quartz and Orthoclase Feldspar

Granitic Pegmatite (SiO2 + KAlSi3O8)

Fulgarite

Fulgurite (Lechatelierite / Vitrified Sand)

Dalmatian Stone (Dalmatian Jasper)

Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite