Mixed (Sedimentary, Igneous, And Metamorphic)

Quartz-rich feldspar rock, possibly pegmatitic granite

Granite or granitic pegmatite; mainly quartz (SiO₂) and feldspar, with possible mica

Conglomerate

Sedimentary Conglomerate

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Hematite/Limonite inclusions

Mixed Crushed Stone

Aggregate (varied mineral composition)

Conglomerate

Conglomeratic Sandstone

Micaceous schist

Mica schist, commonly muscovite–biotite–quartz schist

Tumbled dark green stone, likely greenstone/serpentinite

Serpentinite (serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄), possibly chlorite-rich greenstone

Unakite

Altered Granite (Epidotized Granite)

Conglomeratic sandstone or breccia specimen

Quartz-rich clastic sedimentary rock; likely sandstone with pebble-sized quartz, feldspar, and lithic clasts

Mixed tumbled gravel and quartz-rich sandstone

Primarily quartz (SiO₂), feldspar, and lithic sedimentary fragments; one piece appears to be quartz-rich sandstone

Polished ruby-in-fuchsite (probable)

Corundum (Al₂O₃) with green fuchsite mica (Cr-muscovite), possibly zoisite/amphibole

Magnetite (Lodestone variety)

Magnetite (Fe3O4)

Likely weathered granite or granitic gneiss

Granite: quartz + feldspar + mica; possibly gneiss if the faint banding is structural

Granite Pebble (Pegmatitic Quartz-Feldspar River Rock)

Granite / Quartz-Feldspar-Mica Aggregate

Red Granite

Granite (Felsic Plutonic Rock)

Likely weathered granite or granitic rock

Granite; quartz + feldspar + mica, compositionally variable

Granite pebble

Coarse-grained granitic rock, primarily quartz–feldspar–biotite

Granodiorite

Intermediate Phaneritic Plutonic Rock

Granite

Granite (Felsic Plutonic Rock)

Jasp-Agate

Cryptocrystalline Quartz (SiO2) with Iron Oxide inclusions

Landscaping stones

Unidentified natural fieldstones, possibly granite, gneiss, quartzite, and limestone

Granite

Felsic intrusive igneous rock

Milky quartz crystal cluster

Quartz (silicon dioxide, SiO₂)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Gravel and Pavement Aggregates

Unconsolidated rock fragments / detrital sediments

Mahogany Obsidian

Volcanic Glass (SiO2 with Hematite/Magnetite inclusions)

Conglomerate

Conglomerate

Conglomerate

Polymictic conglomerate; clast-bearing sedimentary rock cemented by silica, calcite, or iron oxides

Jasper with Quartz

Silicon Dioxide (SiO2) - Chalcedony variety

Granite

Intrusive Igneous Rock

Red jasper chips

Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides

Polygenetic Conglomerate (Puddingstone)

Conglomerate (SiO2 matrix with mixed clasts)

Gossan (Iron Cap)

Limonitic Gossan (Fe2O3·nH2O mixed)

Amethyst (Raw Quartz)

Silicon Dioxide (SiO2)

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite)

Banded Chert / Jasper

Silicon Dioxide (SiO2)

Amazonite with Smoky Quartz and Feldspar

Microcline (KAlSi3O8) with Quartz (SiO2)

Granite or granitic gneiss boulders

Quartz–feldspar–mica granitoid; possibly banded gneiss

Unidentified polished stone fragments

Indeterminate; likely mixed lapidary specimens, possibly jasper, agate, or quartz-bearing rock

Kaolin (China Clay)

Kaolinite [Al2Si2O5(OH)4]

Crushed Stone (Gravel/Aggregates)

Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)