Mixed

Concrete Paver (Artificial Cementitious Rock)

Hydrated Portland Cement Aggregate

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 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)

Mixed rounded beach gravel

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

Pink granite fragment

Granite, chiefly quartz, feldspar, and mica

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

Fulgarite

Fulgurite (Lechatelierite / Vitrified Sand)

Connemara Marble

Calcitic Marble / Serpentinite composite

Concrete Rubble with Aggregate

Hardened Portland Cement Paste with Coarse Aggregate

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)

Jasper / Agate with Petrified Wood Inclusion

SiO2

Gravelly, weathered sediment (likely glacial till)

Unconsolidated diamicton; mixed lithologies, commonly including quartz, feldspar, and weathered silicate rock fragments

Polished carnelian jasper / brecciated jasper

Microcrystalline quartz (SiO₂), chalcedony with iron-oxide pigments and opaque jasper fragments

Agate (Brecciated / Moss Agate with Jasproid Inclusions)

Silicon Dioxide (SiO2)

Coarse-grained granite

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

Weathered brown sandstone or quartzite cobble

Indeterminate sandstone; possibly quartz-rich quartzite

Likely rose quartz-bearing pegmatite

Quartz (SiO₂), probably with feldspar and iron-oxide staining

Gold Flakes

Native Gold (Au)

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.)

Pietersite

Silicolite (brecciated tiger's eye with hawk's eye)

River Pebbles and Quartz

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

Decorative mosaic cross containing mixed rock and glass fragments

Polychrome aggregate; likely quartz, feldspar, marble, granite, and assorted colored glass

Slag Glass / Industrial Slag

Anthropogenic Glass

Variscite (or potentially a turquoise/variscite matrix cabochon, or an impression jasper)

AlPO4·2H2O (Variscite) or related phosphate/silicate material depending on exact composition

Conglomerate

Conglomerate

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

Graphite

Graphite (Carbon, C)

Graphite

Graphite (Native Carbon, C)

Mixed mineral and shell specimen assortment

Primarily unidentified quartz-/feldspar-like pebbles with possible dark basalt or iron-rich fragments; white pieces may include shell or calcite

Quartz (Engineered Stone Countertop)

Silicon Dioxide (SiO2) with polymer resins

Biological Specimen (Domestic Dog)

Canis lupus familiaris

Unakite

Epidotized Granite