Anthropogenic Material

Iron Meteorite

Meteorite (primarily Fe-Ni alloy with kamacite and taenite)

Iron Meteorite

Meteoritic Iron (Fe-Ni alloy)

Iron Meteorite

Nickel-iron alloy (Kamacite and Taenite)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Flint (chert)

Microcrystalline quartz, SiO₂

Dark-colored rock fragment, possibly basalt

Basalt (tentative; image alone is insufficient for reliable identification)

Tumbled blue lace agate

Banded chalcedony, a microcrystalline variety of quartz (SiO₂)

Diamond

Carbon (C)

Diamond

Carbon (C)

Diamond

Carbon (C)

Chalcedony

Silicon dioxide (SiO2)

Weathered stone nodule or concretion

Unidentified lithic concretion; composition cannot be determined from the image

Chert (Arrowhead Fragment)

Cryptocrystalline quartz (SiO2)

Milky quartz

Quartz (SiO₂), crystalline silica

Polished jasper bead necklace

Jasper, an opaque, microcrystalline variety of quartz (SiO₂), colored by mineral impurities; some beads may be patterned brecciated or orbicular jasper.

Quartz Gravel

Silicon dioxide (SiO2)

Clay

Hydrous aluminum phyllosilicate

Pebble

Lithic fragment

Quartz Sand

Silicon Dioxide (SiO2)

Crushed Limestone

Calcium Carbonate (CaCO3)

Tumbled blue-dyed stone, likely basalt or blue aventurine

Likely fine-grained basalt (plagioclase and pyroxene), possibly coated or dyed; exact identification requires testing

Red Sandstone

Sedimentary Clastic Rock (Quartz Arenite)

Sandstone

Sedimentary rock composed mainly of quartz sand-sized minerals

Red Sandstone

Quartz arenite / Lithic sandstone

Unakite

Epidotized Granite

Tiffany Stone

Fluorite-bearing Opalized Breccia

Polished ocean jasper (orbicular jasper)

Jasper, microcrystalline quartz (SiO₂), commonly with iron oxides and chalcedony

Polished Porcelain Jasper

Jasper (microcrystalline quartz, SiO₂), commonly sold as Porcelain Jasper

Likely iron-stained quartz or quartzite pebbles

Quartz (SiO₂), possibly quartzite; identification is uncertain from the blurry image

Fossiliferous limestone pebble

Bioclastic limestone, commonly calcitic (CaCO₃)

Polished pale chalcedony or quartz pebble

Microcrystalline quartz, SiO₂; possibly milky quartz/chalcedony

Iron-rich sandstone or weathered laterite

Ferruginous sandstone, composed mainly of quartz with iron-oxide cement (Fe₂O₃/FeOOH)

Weathered quartz-rich rock, possibly quartzite or silicified sandstone

Quartzite (predominantly microcrystalline quartz, SiO₂); precise identification requires testing

Amphibolite

Hornblende–plagioclase amphibolite

Tumbled granite (likely granodiorite)

Granite–granodiorite aggregate, chiefly quartz, feldspar, and biotite/hornblende

Quartzite

Quartzite

Likely quartz-rich rock or weathered granite fragment

Granite-like quartz–feldspar aggregate; exact identification requires testing

Coquina / Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate - CaCO3)

Red Sandstone

Arenite (with Iron Oxide cement)

Probable fossil-bearing rock or mineral concretion

Unidentified carbonate-rich concretion with a possible fossil inclusion

Iron-rich concretion or weathered ironstone pebble

Goethite/limonite-bearing ironstone; commonly an iron-oxide concretion (FeO(OH)·nH₂O, variable)