Igneous, Metamorphic, And Sedimentary (Mixed Assemblage)

Caribbean Calcite

Calcite (CaCO3) with Aragonite (CaCO3)

Pyrite

Iron Sulfide (FeS2)

Lapis lazuli rough

Lapis lazuli, a rock composed mainly of lazurite (Na₃CaAl₃Si₃O₁₂S) with calcite and commonly pyrite

Lapis Lazuli

Lapis lazuli (complex rock composed of Lazurite, Calcite, and Pyrite)

Unakite

Unakite (Metasomatized Granodiorite)

Asphalt

Asphalt concrete

Gemstone bead necklace, likely mixed tourmaline and quartz

Probable schorl/dravite tourmaline with quartz or smoky quartz; exact identification requires testing

Rhodonite

Rhodonite, manganese inosilicate — MnSiO₃; the specimen may include quartz, feldspar, and black manganese-oxide minerals in the matrix

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)

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)

Quartz with Chlorite / Greenschist

Quartz vein in Greenschist (SiO2 with Chlorite group minerals)

Tumbled Mineral Collection (Amethyst, Celestite, K2 Jasper, Rose Quartz, Ruby in Zoisite, Que Sera Stone)

Mixed Mineral Specimens (Quartz SiO2, Celestite SrSO4, Corundum Al2O3 with Zoisite, etc.)

Gem Gravel

Alluvial Gem Gravel (Mixed silicate minerals)

Greenstone (likely chlorite-rich metamorphic rock)

Chlorite schist/greenstone; possible actinolite- or epidote-bearing assemblage

Granite

Felsic intrusive igneous rock

Tumbled clear quartz

Quartz (SiO₂)

Tumbled clear quartz

Quartz (silicon dioxide, SiO₂)

Magnetite

Magnetite (Fe3O4)

Likely weathered granite

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

Weathered quartz-rich pebble, possibly quartzite or granite fragment

Quartzite (mostly SiO₂), though the specimen may contain feldspar and other silicates

Pink Granite

Phaneritic Plutonic Felsic Igneous Rock (Granite)

Tumbled garnet-bearing rock (possible almandine garnet)

Likely almandine garnet, Fe₃Al₂(SiO₄)₃, in a dark host rock; identification is uncertain from the image alone.

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

Green aventurine / epidote-bearing metamorphic rock

Likely chlorite- and epidote-rich schist or altered amphibolite; exact identification requires testing

Rounded pebble, likely mixed lithology

Lithology uncertain; possibly a fine-grained metamorphic or volcanic rock with a quartz-rich/pink feldspar vein or inclusion

Schist

N/A (a rock type, not a mineral formula)

Conglomerate

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

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)