Sedimentary And Igneous (Mixed)

Feldspar-Quartz Rock (likely Pegmatite or Granite)

Feldspar-Quartz composite rock (KAlSi3O8 - SiO2)

Granite Pebble

Granite (composed of Quartz, Feldspar, and Mica)

Concrete Fragment

Artificial Conglomerate (Cement and Aggregate)

Asphalt (Bituminous Rock)

Natural bitumen or Bituminous limestone/sandstone

Caribbean Calcite

Calcite (CaCO3) with Aragonite (CaCO3)

Asphalt

Asphalt concrete

Ptygmatic Migmatite

Migmatite (consisting of Neosome and Paleosome fractions)

Pink granite fragment

Granite, chiefly quartz, feldspar, and mica

Granite

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

Smoky Quartz and Orthoclase Feldspar

Granitic Pegmatite (SiO2 + KAlSi3O8)

Mixed stream gravel and common rock specimens

Predominantly quartz-rich granitoid, quartzite, sandstone, shale/slate, and mafic volcanic fragments; exact species cannot be determined confidently from the image

Granite

Granite (Plutonic Igneous Rock)

Pink Granite

Phaneritic Felsic Igneous Rock

Copper Ore (Malachite and Limonite bearing)

Cuprite, Malachite, and Limonite mixture

Tumbled beige stone, possibly quartz or calcite

Indeterminate from photograph; likely microcrystalline quartz (SiO₂) or calcite (CaCO₃)

Granite

Felsic intrusive igneous rock

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

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

Likely weathered granite

Granite, a coarse-grained felsic plutonic rock; exact identification is uncertain from the image

Pink Granite

Phaneritic Plutonic Felsic Igneous Rock (Granite)

Mixed rounded river pebbles

Polymictic gravel; individual clasts likely include quartzite, granite, and other common rocks

Weathered rock pebble, possibly sandstone

Likely quartz-rich sandstone; precise identification requires closer examination

Conglomerate

Lithified, poorly sorted gravel; composition is uncertain from the image

Rounded fine-grained river pebble, likely andesite

Probable andesite (plagioclase feldspar with pyroxene and/or amphibole; exact identification requires testing)

Fulgarite

Fulgurite (Lechatelierite / Vitrified Sand)

Conglomerate (pebble-to-cobble gravel)

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

Jasper / Agate

Silicon dioxide (SiO2)

Likely rose quartz-bearing pegmatite

Quartz (SiO₂), possibly with feldspar and mica; exact identification is uncertain from the photo

Granite pebble

Granite, a coarse-grained quartz–feldspar rock with dark mica or amphibole

Granite (likely a weathered granite cobble)

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

Quartz-rich pegmatite specimen

Hydrothermal/pegmatitic quartz aggregate, chiefly SiO₂, with probable feldspar and mica/accessory sulfides

Dalmatian Stone (Dalmatian Jasper)

Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite

Mixed Gemstone and Mineral Collection

Mixed Silica and Carbonate minerals (SiO2, CaSO4·2H2O, etc.)

Tumbled white quartz (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Granite fragment

Granite; predominantly quartz (SiO₂), feldspar, and mica

Jasper and Quartz

Silicon Dioxide (SiO2)

Jasper (Green Jasper/Heliotropic Chert)

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

Venetian Gold Granite

Phaneritic Felsic Igneous Rock (Granite)

Ironstone concretion (possibly pyrite-bearing)

Iron-rich sedimentary concretion, likely composed of goethite/limonite with possible pyrite

Rounded river gravel (mixed alluvial pebbles)

Polymictic alluvial gravel; commonly composed of quartzite, granite, basalt, sandstone, and quartz

Pink Granite

Phaneritic intrusive igneous rock (Granite)

Pink Granite

Phaneritic intrusive igneous rock (Granite)