Sedimentary Rock (Possibly Composed Of Various Minerals)

Jasper

Microcrystalline quartz (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Mottled granite

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

Mineral Specimen Collection (Galena, Quartz, Calcite, Hematite, etc.)

Mixed Mineral Assemblage (PbS, SiO2, CaCO3, Fe2O3, ZnS, etc.)

Not a geological specimen

N/A (man-made object)

Assorted Beach Rocks and Pebbles

Various (Granite, Basalt, Quartz, Conglomerate, etc.)

Likely weathered volcanic rock (possibly basalt)

Basalt, a fine-grained mafic igneous rock; exact identification is uncertain from the photograph

Land Snail Shell

Gastropoda

Aggregate Concrete

Anthropogenic Conglomerate (Technosol)

Gneiss

Gneiss (High-grade metamorphic rock composed primarily of Quartz, Feldspar, and various Micas)

Pink Granite

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

Granite (Pink/Red Granite)

Phaneritic Felsic Igneous Rock

Pale green-gray stone, possibly serpentinite

Serpentinite (rock composed mainly of serpentine-group minerals)

Dark, iron-stained rock; exact identification uncertain

Possibly a fine-grained mafic igneous rock (basalt or diabase); image alone is insufficient for a reliable species-level identification

Likely mica-bearing metamorphic rock (possibly schist)

Mica schist, composed mainly of quartz and mica (muscovite and/or biotite); identification is approximate from the image

Sandstone

Arenite (SiO2 with various cementing minerals)

Sandstone

Arenite (Sedimentary Rock)

Mixed River Pebbles and Jasper

Siliciclastic sediment and microcrystalline quartz

Pyrite-rich Ore

Pyrite (FeS2) with secondary minerals

Sandstone

Arenite (SiO2 based)

Chakra Stone Bracelet

Mixed Mineral Assembly (Scoria, Amethyst, Lapis Lazuli, Turquoise/Howlite, Impression Jasper, Tiger's Eye, Carnelian, Red Jasper)

Rounded black-and-cream granite pebble

Granite, composed chiefly of quartz, feldspar, and dark mica or amphibole

Iron-rich rock fragment (possibly ironstone or limonite/goethite)

Likely ironstone composed largely of goethite/limonite; image alone cannot confirm

Limestone (fossiliferous or weathered)

Sedimentary carbonate rock primarily composed of calcium carbonate (CaCO3)

Unidentified polished stone fragments

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

Sandstone

Arenite

Dark gray metamorphic cobble, likely slate or phyllite

Foliated metapelite; possibly slate/phyllite composed mainly of quartz, mica, and chlorite

Fossilized Bivalve Shell

Class Bivalvia

Peridotite

Ultramafic igneous rock

Granitic Gravel and Soil

Regolith / Alluvial sediment

Rough Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (SiO2 dominated)

Seashell Fragment

Calcium Carbonate (CaCO3) in the form of Aragonite or Calcite

Limestone

CaCO3 (principally composed of Calcite)

Green serpentine-rich rock (possibly serpentinite)

Serpentinite, composed chiefly of serpentine-group minerals (e.g., lizardite, antigorite, or chrysotile)

Sandstone (Tumbled/River Pebble)

Arenite (composed primarily of SiO2)

Ironstone concretion (possibly pyrite-bearing)

Iron-rich sedimentary concretion, likely composed of goethite/limonite with possible pyrite

Dragon Blood Jasper (Dragon Stone / Epidote-Piemontite/Jasper rock)

Epidote with Piemontite / Chalcedony aggregate

Quartz Pebble

Silicon Dioxide (SiO2)