This Is Not A Rock Or Mineral

Cobalt Glass Slug (Man-made Glass)

Amorphous Silica with Cobalt Oxide (SiO2 + CoO)

Bauxite

Alumina ore (Mixture of Gibbsite, Boehmite, and Diaspore)

Limonite (Yellow Ochre)

Hydrated Iron Oxide (FeO(OH)·nH2O)

Native metal specimen, likely galena or metallic slag

Probably galena (lead sulfide, PbS); identification is uncertain from the image alone

Bauxite

Bauxite (Mixture including Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))

Lapis Lazuli

Na8(Al6Si6O24)S2 (composed primarily of Lazurite, Calcite, and Pyrite)

Polished fossiliferous limestone

Bioclastic carbonate rock, primarily calcite (CaCO₃)

Bauxite (Laterite Clay)

Bauxite (mixture of Hydrous Aluminum Oxides: Gibbsite Al(OH)3, Boehmite and Diaspore AlO(OH))

Acrylic or Resin (Synthetic Imitation)

Polymethyl Methacrylate (PMMA) or Polyepoxide

Everest

Canis lupus familiaris (Siberian Husky)

Amber

Succinite (Fossilized Tree Resin)

Granite, possibly granodiorite

Coarse-grained felsic plutonic rock; chiefly quartz (SiO₂), potassium feldspar and plagioclase feldspar, with biotite and/or hornblende

Metal Alloy (Likely Pewter or Sterling Silver)

Not a natural geological specimen; composed of refined metals. If pewter, it's a tin-based alloy. If sterling silver, it's 92.5% silver and 7.5% other metals (usually copper).

Man-made Blank Ammunition (Brass)

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

Abbey Bominable (Monster High character)

Anthropomorphic Yeti / Digital Animation

Lapis Lazuli

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Note: Item is not a geological specimen

Polyester mesh and Ethylene-vinyl acetate (EVA) polymer

Opalite (Man-made Glass)

Synthetic Opalised Glass

Note: Item is not a geological specimen

n/a

Honey-colored chalcedony (possibly yellow/orange agate or carnelian)

Chalcedony, a microcrystalline variety of quartz; SiO₂. The color may result from iron-oxide inclusions. Exact identification is uncertain from a photograph alone.

Brecciated jasper, possibly rainforest jasper or brecciated rhyolite

Brecciated microcrystalline quartz (SiO₂), commonly called jasper; the green portions may contain epidote, chlorite, or iron-bearing silicates, while red-brown areas are typically hematite or other iron oxides

Quartz (Druzy) in host rock

SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)

Bauxite Ore

Hydrated aluminum oxides (e.g., Gibbsite Al(OH)3, Boehmite ̲̲̲̲AlOOH, Diaspore ̲̲̲̲AlOOH)

Weathered porphyritic basalt

Basalt, likely plagioclase-phyric basalt; primarily a fine-grained aggregate of plagioclase feldspar, clinopyroxene, and possibly olivine or iron-titanium oxides

Amber

Fossilized Tree Resin (Amorphous Hydrocarbon)

Nephrite Jade

Nephrite

Northern Shoveler Duck (Note: This is a biological specimen, not a rock)

Spatula clypeata

Copper Ore / Altered Granodiorite

Cupriferous rock with silicate gangue

Granite

Intrusive Igneous Rock

Basalt with Quartz Vein

Mafic volcanic rock with hydrothermal SiO2 filling

Granite (weathered cobble)

Granite; chiefly quartz, feldspar, and mica/amphibole

Rock Specimen

Unclassified rock specimen

Small red-brown mineral or rock fragment

Unidentified; possibly iron-oxide-rich jasper, garnet, or weathered sulfide

Milky Quartz Pebble with Iron Inclusions

Silicon Dioxide (SiO2)

Red Sandstone

Clastic Sandstone (typically Quartz-rich with Iron Oxide)

Gravel / Crushed Stone

Aggregate (mixed mineral rock fragments)

River Rock / Stream Pebble

Fluvial Clast / Rounded Sedimentary Particle

Druzy Quartz on Limestone

Silicon Dioxide (SiO2) on Calcium Carbonate (CaCO3)

Crushed Granite and Basalt

Phaneritic Igneous Rock / Aphanitic Igneous Rock

Geode

Quartz nodule / Chalcedony-lined cavity

Coarse-grained gray metamorphic rock, likely gneiss

Biotite–quartz–feldspar gneiss (probable)

Sandstone

Arenite