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)

Carved opalite pendant

Opalite (man-made opalescent glass; not a natural mineral)

Gold ring with a clear faceted gemstone

Likely diamond (carbon, C); the photograph is insufficient to confirm the stone or metal

Anthropogenic Heat Source (Electronic/Industrial Interface)

Thermal IR emission (Electronic infrastructure)

Quartz in Limonite-rich Matrix

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

Limonite Concretion

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

Blue tumbled glass-like specimen; likely blue slag glass

Likely man-made glass (silicate glass), not a natural mineral; exact material cannot be confirmed from the image

Gemstone butterfly brooch/pendant

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

Marine gastropod shell

Calcium-carbonate shell, primarily aragonite; species cannot be determined from the image

White sea glass (naturally frosted glass fragment)

Man-made silicate glass, typically soda-lime glass; not a mineral or rock

Sea glass (likely green bottle glass)

Human-made soda-lime silicate glass; not a natural mineral or geological rock

Goethite / Limonite Gossan

Hydrated Iron Oxide (FeO(OH))

Likely coal (possibly anthracite)

Coal, composed chiefly of carbon-rich organic matter; rank cannot be confirmed from the photograph

Green sea glass (likely)

Anthropogenic glass, not a mineral; composition commonly soda–lime silicate glass

Limonite Concretion

FeO(OH)·nH2O (Hydrated Iron Oxide)

Opalite

Opalescent Glass (SiO2 + coloring agents)

Dyed Pumice

Vesicular Rhyolite (Artificial Coloration Addition)

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)

Sea glass (likely pale blue glass)

Human-made silicate glass, likely soda-lime glass; not a natural mineral or rock

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

Likely iron-rich slag or weathered ironstone

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

Limonite (after Pyrite Pseudomorph)

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

Opalite

Synthetic Fluorescent Glass (SiO2 + impurities)

Glacial Granite with Epidote

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

Veined Sandstone with Calcite Veins

Sedimentary sandstone with hydrothermal/mineral veins

Man-made Blank Ammunition (Brass)

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

Generic Rock / Pebble

Undetermined rock specimen

Basalt with Red Sandstone

Mafic extrusive igneous rock with quartzose sedimentary matrix

Porphyritic Andesite with Quartz

Andesite porphyry

Small reddish-brown mineral fragment

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

Unidentified small brown rock

Undetermined; image does not show enough detail for reliable identification

Goldstone (aventurine glass)

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

Sandstone Concretion

Sedimentary Concretion (Quartz arenite)