Igneous, Metamorphic, And Sedimentary (Mixed Assemblage)

Pink Quartz

Silicon Dioxide (Quartz), SiO2

Mixed rounded beach gravel

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

Polished carnelian jasper / brecciated jasper

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

Quartz pebble

Silicon dioxide (SiO2)

Weathered granite fragment

Granite, chiefly quartz, feldspar, and mica

Granite Pebble

Intrusive Igneous Rock (Felsic to Intermediate)

Fancy Jasper

Silicon Dioxide (SiO2) with iron and organic inclusions

Eudialyte

Eudialyte (Na4(Ca,Ce)2(Fe2+,Mn,Y)ZrSi8O22(OH,Cl)2)

Clear Quartz

Silicon Dioxide (SiO2)

Citrine

Silicon dioxide (SiO2)

Apatite

Ca5(PO4)3(F,Cl,OH)

Greisen (Quartz-Muscovite-Turretine Rock)

Greisen

Mixed small pebbles and mineral grains

Unidentified detrital sediment; likely quartz-, feldspar-, and lithic fragments

Asphalt aggregate pavement

Bituminous asphalt concrete containing crushed stone aggregate

Asphalt Conglomerate

Artificial Bituminous Conglomerate

Pyrite

Iron Sulfide (FeS2)

Apatite

Fluorapatite (Ca5(PO4)3F)

Clear Quartz (Faceted)

Silicon Dioxide (SiO2)

Blue Quartz

Silicon Dioxide (SiO2) with inclusions

Banded Chert / Jasper

Silicon Dioxide (SiO2)

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Tumbled granite or granitic gneiss

Granite, primarily quartz, alkali feldspar, plagioclase, and dark biotite/amphibole

Weathered quartz-rich rock, possibly granite or granitic pegmatite

Indeterminate quartz–feldspar aggregate; likely granite/pegmatite

Red Granite

Granite (Felsic intrusive igneous rock)

Pink granite

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

Pink Granite

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

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)

White Quartz Beads

Silicon Dioxide (SiO2)

Quartz

Silicon dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Fuchsite on Quartz

Muscovite (KAl2(AlSi3O10)(OH)2) with Chromium impurities

Yellow Jasper

Silicon Dioxide (SiO2) with hydrated iron oxide impurities (Goethite)

Pegmatite

Igneous Pegmatite (Quartz, Feldspar, Micas)

Pegmatite

Granitic Pegmatite

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Unakite (Epidotized Granite)

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

Milky Quartz

Silicon Dioxide (SiO2)

Polished granite pebble

Granite; chiefly quartz, feldspar, and mica/amphibole

Banded Amethyst

Silicon Dioxide (SiO2) with iron impurities

Quartz

Silicon Dioxide (SiO2)