Mixed (Predominantly Sedimentary And Igneous)

Granite (Pink/Red)

Phaneritic Igneous Rock (Rich in K-Feldspar)

K2 Jasper (K2 Granite)

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

Quartz-bearing feldspar pegmatite (likely with mica/tourmaline)

Granitic pegmatite; chiefly quartz (SiO₂) and feldspar, with dark mica or tourmaline

Granite pebble

Granite; primarily quartz, alkali feldspar, plagioclase, and dark mica/amphibole

Polished/rounded granite cobble

Granite, chiefly quartz (SiO₂), feldspar, and mica/amphibole

Turquoise and Hematite

CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Fe2O3 (Hematite)

Polymict conglomerate

Clastic conglomerate, likely polymictic pebble conglomerate

Unidentified coarse-grained rock fragments

Likely granite or granitic rock; exact identification is uncertain from the photograph

Feldspar (Granite Pegmatite matrix)

Potassium Feldspar (KAlSi3O8) / Quartz Mixture

Hematite

Iron(III) oxide (Fe2O3)

Conglomerate

Conglomerate (Sedimentary rock containing rounded clasts)

Chrysocolla on Matrix

Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)

Polished quartz-rich feldspar rock, possibly orbicular granite

Granite or granitic pegmatite; chiefly quartz (SiO₂), feldspar, and dark biotite/amphibole

Conglomerate

Conglomerate (Clastic sedimentary rock)

Halite

Halite (Sodium Chloride, NaCl)

Tumbled banded stone, likely gneiss or granite

Quartz–feldspar rock, possibly banded gneiss; exact identification requires testing

Quartz-rich rock fragment

Likely milky quartz with feldspar and possible mica; exact rock type is indeterminate from the image

Granite or Granitoid River Rock

Granite

Granite Pegmatite

Pegmatite (Quartz, Feldspar, Mica)

Amethyst with Marcasite accents

Amethyst (Silicon Dioxide SiO2) and Marcasite (Iron Sulfide FeS2)

Mixed Gravel and Pebbles

Polylithic Alluvial Aggregate

Coarse-grained igneous rock, likely granitic pegmatite or weathered granite

Granite/pegmatitic granite; chiefly quartz (SiO₂), feldspar, and dark mica or amphibole

Concrete aggregate surface

Human-made cementitious composite; primarily calcium-silicate-hydrate cement with mixed silicate aggregate

Glauconitic Sandstone (Greensand)

Glauconitic Quartz Arenite (Formula: (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Conglomerate

Conglomerate (clastic sedimentary rock)

Polished hematite

Hematite (Fe₂O₃), likely a tumbled iron-oxide specimen

Granite

Granite (Phaneritic intrusive igneous rock)

Mixed Mineral Bead Bracelet

Polycrystalline and Monocrystalline Silicates/Oxides (Quartz, Howlite, Hematite)

River-rounded landscaping pebbles

Mixed alluvial gravel; commonly quartzite, granite, basalt, sandstone, and quartz

Mookaite Jasper

Silicified radiolarite (SiO2)

Gravel and Pebbles

Unconsolidated rock fragments (clastic sediment)

Mookaite Jasper

Silicified Radiolarite (SiO2)

Fossiliferous limestone (reef or shell-rich limestone)

Bioclastic calcarenite/calcirudite; predominantly calcite (CaCO₃)

Polished decorative stone spheres

Mixed material; individual spheres may be agate, jasper, quartz, or other ornamental minerals

Polished brown jasper

Jasper (microcrystalline quartz, SiO₂), likely iron-oxide-rich variety

Tumbled pink granite or feldspar-rich pebble

Granite; chiefly quartz (SiO₂), feldspar, and minor mica, though the specimen may be pink orthoclase feldspar

Gabbro

Gabbro

Pink Granite

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

Amygdaloidal Basalt

Amygdaloidal Mafic Volcanic Rock

Rhyolitic Tuff

Rhyolitic Tuff / Pyroclastic rock

Lapis Lazuli (Low-grade)

Lapis Lazuli (Aggregate of Lazurite, Calcite, and Pyrite)

Granitic Sand

Detrital sediment (predominantly Quartz, Feldspar, and Mica)