Mineral Description (Anthropogenic Material)

Iron-rich weathered stone, possibly hematite-rich ironstone

Hematite/goethite-bearing ironstone; predominantly Fe₂O₃ and FeO(OH)

Ocean Jasper

Spherulitic Chalcedony (SiO2)

Assorted Semi-Precious Gemstone Crosses

Quartz, Silicates, Carbonates (various)

Rough Diamond

Diamond (pure Carbon, C)

Quartz with Limonite Staining

Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)

Amygdaloidal Basalt

Amygdaloidal Basalt (extrusive volcanic rock with mineral inclusions)

Red Sandstone

Arenite (Iron-rich)

Iron-rich quartzite or weathered ironstone

Quartzite dominated by quartz (SiO₂), with iron oxides/hydroxides such as hematite and goethite

Vesicular Basalt / Scoria (Stream-rounded Cobble)

Mafic extrusive igneous rock

Fuchsite in Quartz (or Emerald in Fuchsite / Verdite)

Chromian Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2) in Quartz Matrix

Weathered fossiliferous limestone

Bioclastic limestone, chiefly calcite (CaCO₃)

Granite

Phaneritic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)

Sandstone (Sedimentary Rock)

Arenite (SiO2 based)

Amber

Fossilized Tree Resin (C10H16O)

Chert (Flint Nobule)

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Fossilized Oyster Shell

Exogyra or Ostrea (Gryphaeidae/Ostreidae family)

Sandstone (likely Quartzose)

Arenite (primarily SiO2)

Granite

Phaneritic plutonic rock (SiO2 typically >69%)

Sandstone (Quartzose)

Arenite (SiO2 based typically)

Banded gneiss

Gneiss; chiefly quartz, feldspar, and mica

Petrified Wood

Silicified wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Chert (Nodule)

Cryptocrystalline Quartz (SiO2)

Sandstone (Red Arkose)

Sandstone (Arkose variant, primarily SiO2 with KAlSi3O8)

Mahogany Obsidian

Obsidian with Hematite inclusions (SiO2 + Fe2O3)

Greenschist

Greenschist (Actinolite-Chlorite Schist)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Chrysocolla in Matrix

Hydrated copper silicates (Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O))

Yellow Quartz (Citrine Quartz Pebble)

Silicon Dioxide (SiO2)

Quartz Grain

Silicon Dioxide (SiO2)

Basalt

Extrusive mafic igneous rock

Sandstone

Sedimentary Rock (Quartz Sandstone)

Granite

Felsic intrusive igneous rock

Vesicular volcanic rock, likely weathered pumice or scoria

Pumice/scoria; predominantly volcanic glass and feldspar, with possible iron oxides

Turquoise with Pyrite

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O] with Iron Pyrite (FeS2)

Amber with dark mineral/organic inclusions

Fossilized plant resin (amber; chiefly polymerized diterpenoid resin)

Tumbled gneiss

Gneiss, chiefly quartz–feldspar with mica and dark ferromagnesian minerals

Carnelian (orange chalcedony)

Chalcedony, microcrystalline quartz (SiO₂), iron-colored variety

Polished pink-and-white quartz bead bracelet

Quartz (SiO₂), likely rose quartz and milky quartz; some orange beads may be iron-stained quartz or pale carnelian

Sandstone (with Iron concretions/staining)

Arenite (composed primarily of Quartz and Feldspar with Iron Oxide cement)