Mixed

Crushed Granite and Quartz Gravel

Composite Igneous and Silicate Rock Aggregate

Quartz with Mica inclusions (Pegmatite)

Silicon Dioxide (SiO2) with Muscovite/Biotite inclusions

Gravel (Crushed Stone Aggregates)

Mixed Siliciclastic / Carbonate Aggregate

River Pebbles (Mixed Suite)

Mixed lithologies: Quartzite and Gneiss

River Pebble

Polished Quartzite or Mixed Lithology

Mahogany Obsidian

Volcanic Glass with Hematite/Magnetite inclusions (SiO2 + Fe2O3)

Road-surface aggregate (crushed stone)

Unidentifiable mixed lithic aggregate; likely basaltic/andesitic fragments with feldspar, quartz, and weathered rock

Engineered Quartz Stone

Agglomerated Quartz (SiO2 + Polymer Resin)

Rounded river gravel (mixed alluvial pebbles)

Polymictic alluvial gravel; commonly composed of quartzite, granite, basalt, sandstone, and quartz

Unakite (or Epidote-rich Granite)

Unakite (Metamorphosed Granite consisting of Epidote, Orthoclase, and Quartz)

Pink Granite

Granite (Felsic Plutonic Rock)

Lapis Lazuli

Lapis Lazuli (contains lazurite, calcite, pyrite)

Asphalt Concrete

Bituminous Concrete / Asphaltic Composite

Caribbean Calcite

Calcite (CaCO3) with Aragonite (CaCO3)

Quartz pebble in concrete

Quartz (SiO₂), embedded in Portland-cement concrete

Cobalt Blue Glass / Cullet Glass

Silicon dioxide (Amorphous man-made glass)

Asphalt Concrete

Bituminous conglomerate

Polished orbicular jasper (likely ocean jasper)

Silicified microcrystalline quartz (SiO₂), commonly called orbicular jasper or ocean jasper

Polymictic conglomerate or breccia (possibly concrete-like aggregate)

Lithified polymictic gravel; clasts may include basalt, granite, quartzite, and other silicates

Iron-rich concretion or weathered ironstone

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

Azurite and Malachite

Cu3(CO3)2(OH)2 (Azurite) / Cu2CO3(OH)2 (Malachite)

Mookaite Jasper

Silicified Radiolarite (SiO2 with iron impurities)

Chrysocolla in Matrix

Chrysocolla (Cu,Al)2H2Si2O5(OH)4·nH2O

Jasper and Quartz

Silicon Dioxide (SiO2)

Jasper / Agate

Silicon dioxide (SiO2)

Concrete with Aggregate

Composite construction material; primary matrix is Calcium Silicate Hydrate (C-S-H)

Concrete rubble

Anthropogenic conglomerate

Mixed Gemstone and Mineral Collection

Mixed Silica and Carbonate minerals (SiO2, CaSO4·2H2O, etc.)

Costume Jewelry Gemstones (Emerald-imitation and semi-precious beads)

BeCuAl6Si6O18 (Beryl structure), frequently simulated by glass or synthetic spinel

Feldspar-Quartz Rock (likely Pegmatite or Granite)

Feldspar-Quartz composite rock (KAlSi3O8 - SiO2)

Unakite

Unakite (altered granite)

Granite Pebble

Granite (composed of Quartz, Feldspar, and Mica)

Unakite

Epidotized Granite

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

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

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)

Concrete fragment with Aggregate

Anthropogenic Concrete with Calcarious and Siliceous Aggregate