Sedimentary Rock (Possibly Composed Of Various Minerals)

Fossilized Bivalve

Phylum Mollusca, Class Bivalvia

Schist (likely mica schist)

Mica schist, commonly quartz–muscovite/biotite schist

Sandstone

Sandstone (composed predominantly of Quartz, SiO2, with Feldspar and Clay minerals)

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)

Gneiss (High-Grade Metamorphic Rock)

Gneiss (primarily composed of Quartz, Feldspar, and Mica/Amphiboles)

Sandstone

Sedimentary rock composed mainly of quartz sand

Sandstone

Sedimentary rock composed mainly of quartz sand

Quartz (Chert/Quartzite variant)

Silicon Dioxide (SiO2)

Lapis Lazuli

Lapis lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)

Lapis Lazuli (Tumbled Specimen)

Lapis Lazuli (Aggregate rock containing Lazurite: (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)

Beach Pebbles and Shells

Mixed Lithology Sedimentary Clasts and Biogenic Carbonate

Vesicular basalt (likely weathered beach basalt)

Basalt, composed mainly of plagioclase feldspar, pyroxene, and variable olivine

Mica-rich rock spheres (possibly pegmatitic mica nodules)

Mica-rich granitic/pegmatitic material; exact identification is uncertain from the photograph

Quartz Crystal

Silicon Dioxide (SiO2)

Gneiss

Banded gneiss; quartz–feldspar–mica rock

Red Sandstone

Clastic Terrigenous Sedimentary Rock (composed mostly of SiO2 with Fe2O3)

Sandstone

Clastic sedimentary rock

Agate

Silicon Dioxide (Chalcedony), SiO2

Weathered iron-rich rock, possibly laterite or limonite-bearing sandstone

Laterite/limonite-rich ferruginous material; composition likely hydrated iron oxides such as goethite (FeO(OH))

Sandstone

Arenite (primarily SiO2)

Sandstone (Micaceous)

Arenite (composed primarily of SiO2)

Fossilized mammalian tooth fragment

Likely a fossil molar or premolar; exact taxon cannot be determined from the image

Polished granite pebble

Granite, a quartz–feldspar plutonic rock with dark accessory minerals

Sandstone

Arenite (Clastic Sedimentary Rock)

Mica-rich metamorphic rock, likely schist

Biotite–muscovite schist, possibly quartz-mica schist

Slate

Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Sandstone (composed predominantly of SiO2)

Weathered quartz-rich rock, possibly quartzite or altered granite

Quartz-dominant silicate rock; exact identification requires a fresh surface and tests

Quartz geode with drusy quartz crystals

Quartz, silicon dioxide (SiO₂), commonly colorless to milky crystalline quartz

Sandstone / Quartzite

Sedimentary quartz arenite

Lapis Lazuli (in Matrix)

Lazurite-bearing Metamorphic Rock (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2

Lapis Lazuli (polished cabochon/sphere)

Na8[Al6Si6O24]Sn with accessory minerals (Pyrite, Calcite)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Calcite (likely a tumbled specimen)

Calcite (CaCO 3 )

Weathered brown rock fragment

Indeterminate; possibly ferruginous sandstone or weathered volcanic rock

Sandstone

Sedimentary Rock (Quartz Sandstone)

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Sandstone

Clastic sedimentary rock (primarily quartz arenite)

Tumbled dark volcanic rock, possibly basalt

Basalt; commonly composed of plagioclase feldspar, pyroxene, and minor olivine or magnetite

Sandstone

Arenite

Weathered quartz-mica schist

Quartz–muscovite/biotite schist, locally iron-oxide stained