Not A Rock Or Mineral

Lapis Lazuli

Lazurite-rich metamorphic rock

Lapis Lazuli

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

Lapis Lazuli

Na8(Al6Si6O24)S2 (Lazurite is the primary constituent mineral)

Note regarding baguette production (not a rock)

Digital text image - Somali language

Lapis Lazuli

Lapis Lazuli (Mineral composition: Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2, Calcite, and Pyrite)

Note: Item is not a geological specimen

n/a

Granite, possibly granodiorite

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

Amber

Succinite (Fossilized Tree Resin)

Anthracite Coal

Anthracite (a variety of coal, predominantly carbon)

Lapis Lazuli

Lazurite-dominant rock, (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2

Lapis Lazuli

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

Opalite (Man-made Glass)

Synthetic Opalised Glass

Amphibolite

Amphibolite

Dalmatian Stone

Peralkaline Quartz-Feldspar Rock with Arfvedsonite

Lapis Lazuli

Complex mixture of minerals, primarily Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Clear quartz sphere or polished quartz cabochon (tentative)

Quartz, silicon dioxide (SiO₂); appearance may also be consistent with ordinary glass, which cannot be ruled out from the image alone

Ruby in Fuchsite

Corundum (Al2O3) in Fuchsite (K(Al,Cr)3Si3O10(OH)2)

Note on Image Identification: Textile

N/A (Anthropogenic material)

River Rock

Sedimentary Rock (various compositions)

Nephrite Jade

Nephrite

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

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).

Serpentine

Serpentinite (a rock composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite; general formula (Mg, Fe)3Si2O5(OH)4)

Biological Bone (Patella/Knee)

Patella (part of the Human Skeletal System)

Schist

N/A (a rock type, not a mineral formula)

N/A - Non-Geological Item

Digital Multimeter (Synthetic Object)

Digital Multimeter (DMM)

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.

Pumice

Pumice (volcanic rock)

Granite

Granite (a felsic intrusive igneous rock)

Granite

Intrusive Igneous Rock

Copper Ore / Altered Granodiorite

Cupriferous rock with silicate gangue

Abbey Bominable (Monster High character)

Anthropomorphic Yeti / Digital Animation

Basalt with Quartz Vein

Mafic volcanic rock with hydrothermal SiO2 filling

Rock Specimen

Unclassified rock specimen

Quartz (Druzy) in host rock

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

Gneiss

Gneiss (a rock type, not a specific mineral with a formula)

Bauxite Ore

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

Milky Quartz Pebble with Iron Inclusions

Silicon Dioxide (SiO2)

Red Sandstone

Clastic Sandstone (typically Quartz-rich with Iron Oxide)

River Rock / Stream Pebble

Fluvial Clast / Rounded Sedimentary Particle

Gravel / Crushed Stone

Aggregate (mixed mineral rock fragments)