Mixed (Predominantly Sedimentary And Igneous)

Smoky Quartz and Orthoclase Feldspar

Granitic Pegmatite (SiO2 + KAlSi3O8)

Copper Ore (Malachite and Limonite bearing)

Cuprite, Malachite, and Limonite mixture

Feldspar-Quartz Rock (likely Pegmatite or Granite)

Feldspar-Quartz composite rock (KAlSi3O8 - SiO2)

Granite Pebble

Granite (composed of Quartz, Feldspar, and Mica)

Mixed river stones and gravel

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

Mixed small mineral specimens, likely quartz varieties

Uncertain from the image; translucent pieces may be quartz (SiO₂), while golden-brown pieces could be iron-stained quartz or calcite

Jasper / Agate

Silicon dioxide (SiO2)

Pink granite fragment

Granite, chiefly quartz, feldspar, and mica

River Pebble

Polished Quartzite or Mixed Lithology

Quartz

Silicon Dioxide (SiO2)

Ruby in Zoisite

Anyolite (composite of Corundum Al2O3 and Zoisite Ca2Al3(SiO4)(Si2O7)O(OH))

Granite

Felsic intrusive igneous rock

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

Granite

Granite (Plutonic Igneous Rock)

Pink Granite

Phaneritic Felsic Igneous Rock

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

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

Likely serpentinite (serpentine-rich rock)

Serpentinite, composed mainly of serpentine-group minerals (e.g., antigorite, lizardite, or chrysotile)

Epidote with Quartz Vein

Epidote-bearing metamorphic rock with quartz (Ca2(Al,Fe)3(SiO4)3(OH))

Jasper and Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Polished amethyst bead fragments

Amethyst, purple quartz (SiO₂)

Asphalt Concrete

Bituminous conglomerate

Dalmatian Stone (Dalmatian Jasper)

Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite

Gneiss

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

Iron-rich concretion or weathered ironstone

Goethite–hematite-rich limonite (FeO(OH)·nH₂O / Fe₂O₃)

Fulgarite

Fulgurite (Lechatelierite / Vitrified Sand)

Pink Granite

Phaneritic Plutonic 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

Mixed mineral and rock specimen collection

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

Dalmatian Stone

Peralkaline rhyolite with arfvedsonite (formerly incorrectly called Dalmatian Jasper)

Hematite cameo or hematine imitation

Hematite (Fe₂O₃); possibly synthetic hematine or black glass

Unidentified weathered rock fragments

Likely mixed silicate rocks; specific identification requires testing

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

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

Greenstone or Epidote-rich rock

Epidote or Chlorite schist/greenstone

Carnelian

SiO2 (Microcrystalline Quartz / Chalcedony)

Weathered quartz-rich metamorphic rock

Likely quartzite or quartz-veined schist; predominantly SiO₂ (quartz) with possible feldspar, mica, and iron-oxide minerals

Coarse-grained granite

Granite, composed chiefly of quartz, potassium feldspar, plagioclase, and biotite/hornblende

Pink Granite

Phaneritic intrusive igneous rock (Granite)

Pink Granite

Phaneritic intrusive igneous rock (Granite)

Lapis Lazuli

Lapis Lazuli (Rock containing lazurite, calcite, and pyrite)