Mixed (Sedimentary, Igneous, And Metamorphic)

Conglomerate

Sedimentary Conglomerate

Black Tourmaline (Schorl)

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Weathered quartz-rich rock, possibly granite or granitic pegmatite

Indeterminate quartz–feldspar aggregate; likely granite/pegmatite

Pink granite

Coarse-grained granitic rock, chiefly orthoclase microcline feldspar, quartz, and dark biotite/amphibole

Red Granite

Granite (Felsic intrusive igneous rock)

Gabbro (Water-worn pebble)

Gabbro

Pegmatite with Lepidolite and Feldspar

Pegmatite (containing K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 and KAlSi3O8)

Copper Ore

Cupriferous Rock / Mixed Mineral Matrix

Black granite (likely polished gabbro or diabase)

Granitoid rock dominated by feldspar, quartz, and dark mafic minerals; exact identification requires testing

Asphalt Conglomerate

Artificial Bituminous Conglomerate

Conglomerate

Conglomerate (Sedimentary rock containing rounded clasts)

Unakite (Epidotized Granite)

Epidotized Granite (mixture of Orthoclase, Epidote, and Quartz)

Agate (Lake Superior Agate variant)

Chalcedony / Silicon Dioxide (SiO2)

Diorite (River Rock/Cobble)

Intermediate Plutonic Igneous Rock (Diorite)

Pink Granite

Granite (Phaneritic Acidic Igneous Rock)

Barite

Barium Sulfate (BaSO4)

Graphite-bearing schist (probable)

Graphite–quartz–mica schist; chiefly graphite (C), quartz (SiO₂), and mica

Lunar Meteorite

Lunar Feldspathic Breccia

Pink Granite

Phaneritic Quartz-Feldspar Plutonic Rock

Concrete Paver (Artificial Cementitious Rock)

Hydrated Portland Cement Aggregate

Sodalite

Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)

African Turquoise

African Turquoise (a trade name for Jasper, a variety of Chalcedony: SiO2)

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Granite Pegmatite

Pegmatite (Quartz, Feldspar, Mica)

Tiger's Eye / Hawk's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Conglomerate

Conglomerate (clastic sedimentary rock)

Mahogany Obsidian

Volcanic glass containing Magnetite/Hematite

Granite Pebble

Granite

Red Agate Sphere (or Banded Jasper/Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Conglomerate (pebble-to-cobble gravel)

Polymictic conglomerate; clast-supported conglomerate in a sandy or silty matrix

Sandstone (likely Greywacke or Siltstone variety)

Arenite / Siltstone (primarily SiO2)

Quartz and Mixed Sedimentary Rocks

Silicon Dioxide (SiO2) mixed with various clastic sedimentary lithologies

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Granodiorite

Granodiorite (intermediate intrusive igneous rock containing plagioclase, quartz, and K-feldspar)

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

Sandstone (lithic wake/graywacke variety)

Arenite/Greywacke (SiO2 with lithic fragments)

Granite

Granite (Phaneritic intrusive igneous rock)

Granodiorite

Phaneritic-textured Intrusive Granodiorite

Garnet (likely Almandine, Pyrope, or a blend)

Garnet group minerals: X3Y2(SiO4)3, where X and Y represent various metal ions (e.g., Almandine: Fe3Al2(SiO4)3, Pyrope: Mg3Al2(SiO4)3)

Granite (Pink/Red)

Phaneritic Igneous Rock (Rich in K-Feldspar)

K2 Jasper (K2 Granite)

Azulite in Granite (Quartz + Feldspar + Biotite + Azurite)

Mixed River Stones and Agates

Mixed Silicates and Ironstones (primarily SiO2 and Fe2O3)