Mixed

Weathered limestone or calcareous concretion

Calcite-rich limestone; predominantly calcium carbonate (CaCO₃)

Quartz-rich granitic cobble

Granite or granitic gneiss; primarily quartz, feldspar, and mica

Serpentine (likely polished/tumbled)

Serpentinite; chiefly antigorite, lizardite, and/or chrysotile Mg₃Si₂O₅(OH)₄

Green Spot Jasper (Kiwi Jasper / Sesame Jasper)

Partially altered granitic rock rich in quartz, microcline feldspar, and tourmaline or amphibole inclusions

Granite / Feldspar gravel

Granite (felsic intrusive igneous rock)

Concrete or asphalt-like aggregate surface with a dark fragment

Uncertain; likely artificial concrete containing mixed lithic aggregate, not a natural rock

Weathered iron-rich rock, possibly limonite/goethite or ironstone

Limonite (hydrated iron oxides; commonly goethite, FeO(OH), with hematite and/or magnetite)

Granite

Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica

Polished granite (likely gneissic or migmatitic granite)

Granite, a quartz–feldspar plutonic rock; exact variety cannot be determined from the image

Landscaping river rock (mixed rounded pebbles)

Mixed lithologies; likely water-worn quartzite, granite, and other silicate pebbles

Likely granite

Granite, a coarse-grained intrusive igneous rock composed mainly of quartz, feldspar, and mica

Amphibolite

Amphibolite, composed mainly of amphibole and plagioclase feldspar

Tumbled pink granite

Granite, composed mainly of quartz, potassium feldspar, plagioclase, and dark mica or amphibole

Gneiss (probable)

Quartz–feldspar–mica gneiss; exact mineral composition cannot be confirmed from the image

Granite

Coarse-grained granitic rock, primarily quartz, alkali feldspar, plagioclase, and dark biotite/amphibole

Mica-bearing metamorphic rock, likely schist

Muscovite–biotite schist, possibly phyllite

Weathered granite fragment

Granite, chiefly quartz, feldspar, and mica

Jasper Rose Quarts / Ferruginous Quartz

Silicon Dioxide (SiO2) with Hematite inclusions

Epidote in Quartz

Epidote (Ca2(Al2,Fe3+)3(SiO4)3(OH)) / Quartz (SiO2)

Banded Amethyst

Silicon Dioxide (SiO2) with iron impurities

Granite or granitic gneiss pebble

Quartz–feldspar–mica aggregate; likely granite, possibly foliated gneiss

Granite Pebble

Intrusive Igneous Rock (Felsic to Intermediate)

Arkosic Sandstone (or Conglomeritic Sandstone fragment)

Arkose (rich in feldspar)

Tumbled Mixed Gemstones (Quartz and Rutile)

Silicon Dioxide (SiO2) with various inclusions

Asphalt Concrete

Bituminous Concrete (Anthropic Rock)

Chert Pebble

Chert (Microcrystalline Quartz, SiO2)

Jasper (Green Jasper/Heliotropic Chert)

Silicon Dioxide (SiO₂)

Micaceous schist

Mica schist, commonly muscovite–biotite–quartz schist

Botryoidal hematite (specular/earthy hematite)

Hematite, Fe₂O₃

Tumbled jasper (likely brecciated or mahogany jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide inclusions

Polished pink-orange agate/jasper fragment

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions; exact identification is uncertain from the image

Granite fragment

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

Likely lepidolite-bearing pegmatite

Lepidolite mica, K(Li,Al)₃(Si,Al)₄O₁₀(F,OH)₂, with probable quartz/feldspar

Tumbled dark green stone, likely greenstone/serpentinite

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

Graywacke

Graywacke Sandstone

Leopard Skin Jasper

Silicon Dioxide (SiO2) with mineral inclusions

Granite Pebble

Granite

Black Tourmaline

Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)

Fuchsite

Chromium-bearing Muscovite [K(Al,Cr)2(AlSi3O10)(OH)2]

Barite

Barium Sulfate (BaSO4)

Gold and Silver (Metal Components of an Antique Pocket Watch)

Native Gold (Au) and Native Silver (Ag)

Mixed stream gravel and cobbles

Polylithic alluvial deposit; individual clasts are not identifiable at this resolution