Mixed

Concrete Paver (Artificial Cementitious Rock)

Hydrated Portland Cement Aggregate

Gabbro

Mafic intrusive igneous rock

Granite

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

Glacial Cobbles (predominantly Granite and Gneiss)

Mixed lithologies (Quartz, Feldspar, Mica assemblage)

Malachite with Chrysocolla

Copper carbonate hydroxide (Cu2CO3(OH)2) and Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O

Smoky Quartz and Orthoclase Feldspar

Granitic Pegmatite (SiO2 + KAlSi3O8)

Likely weathered granite

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

Granite

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

Mixed gemstone bead strand, likely amethyst and assorted colored stones

Likely purple quartz (amethyst, SiO₂) mixed with unidentified green, orange, and reddish beads

Polymictic conglomerate

Clast-supported conglomerate, typically quartz- and feldspar-rich in a dark matrix

Yellow Ochre (Limonite)

Limonite (FeO(OH)qnH2O)

Dragon Blood Jasper

Epidote with Red Jasper (Quartz-rich aggregate)

Puddingstone

Conglomerate

Conglomerate

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

Conglomerate (possibly concrete-like natural breccia)

Lithified, poorly sorted clastic rock with angular to subrounded mineral and rock fragments in a finer matrix

Mixed Rock and Mineral Collection

Mixed Assemblage (includes Quartz, Jasper, Feldspar, and Turquoise-colored stones)

Mookaite Jasper

Silicified Radiolarite (SiO2)

Gravel or Pebble

Clastic Sedimentary Grain (typically composed of Quartz or Silicate minerals)

Rounded fine-grained river pebble, likely andesite

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

Tumbled unakite

Unakite: epidote, pink potassium feldspar (orthoclase), and commonly quartz

Pink granite fragment

Granite, chiefly quartz, feldspar, and mica

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

Fulgarite

Fulgurite (Lechatelierite / Vitrified Sand)

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

Possibly iron-stained quartz or chalcedony

Quartz/chalcedony (SiO₂), identification uncertain from the image

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

Jasper containing Agate (Jaspagate)

Silicon Dioxide (SiO2)

Milky Quartz with Nephrite Jade

Silicon Dioxide (SiO2) with Ca2(Mg,Fe)5Si8O22(OH)2

Mixed rounded beach gravel

Polymictic alluvial or beach clasts, likely including quartzite, limestone, granite, and other silicate rocks

River Pebbles and Quartz

Mixed Igneous, Sedimentary, and Metamorphic Rocks (Silicon Dioxide SiO2 dominant)

Concrete Rubble with Aggregate

Hardened Portland Cement Paste with Coarse Aggregate

Mixed beach gravel and sand

Unsorted siliciclastic sediment, chiefly quartz and rock fragments

Copper Ore (Malachite and Limonite bearing)

Cuprite, Malachite, and Limonite mixture

Sodalite

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

Concrete / Anthropogenic Conglomerate

Man-made composite material (Portland cement, aggregate, and water)

Aventurine (Green Quartz)

Silicon Dioxide (SiO2) with inclusions of Fuchsite (Mica)

Conglomerate

Conglomeratic Sandstone

Chrysocolla

Hydrated copper silicate - Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)

Breccia

Breccia (Clastic sedimentary rock)

Chakra Stone (Composite / Man-made Bonded Gemstones)

Composite of Quartz, Lapis Lazuli, Aventurine, Tiger's Eye, and Jasper (SiO2, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, etc.)