Not A Geological Specimen

Mixed mineral and rock specimen collection

Mixed assemblage, visibly including quartz, chalcedony/agate, feldspar, mica, dark mafic rocks, and possibly calcite or gypsum

Pink quartz bead necklace/strand

Quartz, silicon dioxide (SiO₂), likely rose quartz or pink chalcedony; exact identification is uncertain from the image

Turquoise cabochon

Turquoise; hydrated copper–aluminum phosphate, approximately CuAl6(PO4)4(OH)8·4H2O (composition varies)

Jewelry (Ring)

Biological Bone (Patella/Knee)

Patella (part of the Human Skeletal System)

Quartz in Limonite-rich Matrix

Silicon Dioxide (SiO2) with Goethite/Limonite FeO(OH)·nH2O

Anthropogenic Heat Source (Electronic/Industrial Interface)

Thermal IR emission (Electronic infrastructure)

Gemstone butterfly brooch/pendant

Likely faceted pink tourmaline or synthetic spinel in gilt metal; exact identification requires testing

Goethite / Limonite Gossan

Hydrated Iron Oxide (FeO(OH))

Dyed Pumice

Vesicular Rhyolite (Artificial Coloration Addition)

Limonite Concretion

FeO(OH)·nH2O (Hydrated Iron Oxide)

Opalite

Opalescent Glass (SiO2 + coloring agents)

Opal cabochon or opal-like decorative specimen

Hydrated amorphous silica, SiO₂·nH₂O; likely synthetic or assembled opal material

Limonite (Gossan)

FeO(OH)·nH2O (Hydrated Iron Oxide)

K2 Jasper (K2 Granite)

Azurite in Granite (Al2Cu3(CO3)2(OH)2 in NaAlSi3O8)

Limonite Concretion

Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)

Opalite

Man-made Glass (Synthetic Opalized Glass)

Green sea glass or green glass-like tumbled material

Amorphous silicate glass; likely anthropogenic soda-lime glass, not a natural mineral

Opalite (a synthetic glass)

Silicon Dioxide (SiO2) with various additives; not a true mineral but a man-made gem simulant

Limonite (after Pyrite Pseudomorph)

Limonite (Hydrated Iron Oxide Mixture, FeO(OH)·nH2O)

Likely iron-rich slag or weathered ironstone

Hematite–goethite-rich material (Fe₂O₃/FeO(OH)); possibly industrial iron slag

Opalite

Synthetic Fluorescent Glass (SiO2 + impurities)

Man-made Blank Ammunition (Brass)

CuZn (Cartridge Brass - roughly 70% Copper, 30% Zinc)

Veined Sandstone with Calcite Veins

Sedimentary sandstone with hydrothermal/mineral veins

Generic Rock / Pebble

Undetermined rock specimen

Glacial Granite with Epidote

Granite featuring Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Fossilized Oyster in Flint

Gryphaea or Exogyra embedded in SiO2 (Flint/Chert)

Small reddish-brown mineral fragment

Uncertain; possibly iron-stained quartz, feldspar, or garnet

Unidentified pale mineral fragment

Likely quartz or calcite; image resolution prevents confident identification

Fairy Stone (Staurolite Cross)

Staurolite (Fe2Al9O6(SiO4)4(O,OH)2)

Oak-grain Laminate (Industrial/Decorative Furniture Finish)

Melamine Resin-impregnated Decorative Paper on Particleboard (Cellulose/Thermosetting Plastic)

Goldstone (aventurine glass)

Man-made copper-bearing glass; not a natural mineral (commonly sold as blue/brown goldstone)

Concretion

Septarian Concretion (Fragmentary)

Petrified Wood (Jet or Coalified Wood appearance)

Silicified wood (principally SiO2) or Carbonized Wood

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Fossiliferous Sandstone Pebble (with Crinoid / Shell Impression)

Sandstone containing fossiliferous inclusions (SiO2 matrix with calcite/silica cast fossil)

Kidney Stone

Nephrolithiasis (Calcium Oxalate, Hydroxyapatite, or Uric Acid)

Phantom Quartz

Silicon Dioxide (SiO2) with inclusions

Glauconite (Greensand Articulated Sandstone)

Glauconite ((K, Na)(Fe, Al, Mg)2(Si, Al)4O10(OH)2)

Basalt with Quartz Vein

Mafic volcanic rock with hydrothermal SiO2 filling

Sandstone / Chert Gravel

SiO2 (Silicon Dioxide based clastic sedimentary rock)

Clear Quartz

Silicon Dioxide (SiO2)