Mixed

Pietersite

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

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)

Connemara Marble

Calcitic Marble / Serpentinite composite

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

Conglomerate (pebble-rich rock)

Clastic sedimentary rock composed of rounded pebble- to gravel-sized clasts cemented in a finer matrix

Likely marble or crystalline limestone

Calcite-rich marble (CaCO₃); image-based identification is uncertain

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 river pebbles (gravel)

Polymictic alluvial gravel; diverse clasts, likely including quartz, feldspar-rich granitoids, and metamorphic rocks

Unakite

Epidotized Granite

Venetian Gold Granite

Phaneritic Felsic Igneous Rock (Granite)

Granite

Granite (Plutonic Igneous Rock)

Gravel and Pavement Aggregates

Unconsolidated rock fragments / detrital sediments

Unakite

Epidotized Granite

Pink Granite

Phaneritic Felsic Igneous Rock

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

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

Mixed mineral and rock specimens

Undetermined assortment; individual pieces may include quartz, feldspar, mica, and other common minerals

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

River Pebbles (including Granite and Basalt)

Mixed Igneous Rocks (Granite, Basalt)

Copper Ore

Cupriferous Rock / Mixed Mineral Matrix

Polygenetic Conglomerate (Puddingstone)

Conglomerate (SiO2 matrix with mixed clasts)

General Gravel (River Rock/River Stones)

Mixed Lithic Sediments (Conglomerate Clasts)

Quartz with impurities or Host Rock

SiO2 (Silicon Dioxide) with mixed silicates

Dalmation Stone

Peralkaline Rock (mixed silicate minerals)

Gossan (Iron Cap)

Limonitic Gossan (Fe2O3·nH2O mixed)

Tiger Iron

Mixed Quartz, Hematite, and Tiger's Eye

Gold dust/flakes with black sand

Gold (Au) mixed with Magnetite/Hematite

Mixed Mineral Collection (Quartz, Amethyst, Rose Quartz, Pyrite, etc.)

Mixed Silicates and Sulfides (SiO2, FeS2)

Gravel / Crushed Stone

Aggregate (mixed mineral rock fragments)

Mossy Rock

Mixed lithology rock with Bryophyta (moss)

Migmatite

Migmatite (Mixed metamorphic-igneous rock)

Silver (Sterling Silver Jewelry)

Argentum (Ag) mixed with Copper (Cu)

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