Man Made Material (Constructed)

Amber

Amber (Fossilized Tree Resin)

Quartz (in matrix)

Quartz (SiO₂)

Petrified Wood

Silicified wood (Quartz/Chalcedony)

Granite

Granite (a common type of Felsic Intrusive Igneous Rock)

Black Chert

Chert (microcrystalline quartz)

Note: Item is not a geological specimen

Polyester mesh and Ethylene-vinyl acetate (EVA) polymer

Oak-grain Laminate (Industrial/Decorative Furniture Finish)

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

Pebble (likely Quartz or Chert)

SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.

Amber

Fossilized Tree Resin (Amorphous Hydrocarbon)

Diamond

Carbon (C), specifically in an isometric crystal system.

Puddingstone (Jasper Conglomerate)

Conglomerate (specific type: Jasper Conglomerate or Hertfordshire Puddingstone)

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Pearls

Aragonite (calcium carbonate) and Conchiolin

Leopard Skin Jasper

Chalcedony (cryptocrystalline quartz) with inclusions

Serpentine

Serpentinite (rock), Serpentine group minerals (e.g., Antigorite, Lizardite, Chrysotile)

Yellow Jade (often Serpentine or Dolomite)

Primarily Serpentine (Mg3Si2O5(OH)4) or Dolomite (CaMg(CO3)2), though the term 'yellow jade' is also sometimes applied to varieties of true nephrite or jadeite.

Marble

Metamorphosed Limestone/Dolomite

Quartz

Silicon Dioxide (SiO₂)

Jade (Nephrite or Jadeite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2 - a variety of actinolite, an amphibole mineral); Jadeite (Na(Al,Fe3+)Si2O6 - a pyroxene mineral)

Quartz (likely a weathered/tumbled piece)

Quartz (SiO₂)

Quartz

Silicon Dioxide (SiO2)

Chalk

Calcareous Ooze (composed primarily of coccoliths)

Himalayan Salt

Halite (mineral name), chemical formula NaCl (sodium chloride). Generally, 'Himalayan Salt' is a trade name for evaporite minerals from specific regions.

Chert (Jasper-like)

SiO2 (Cryptocrystalline Quartz)

Peridot (Olivine)

Olivine ((Mg,Fe)2SiO4)

Quartz (chalcedony variety) or Limestone with Quartz Veins

SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)

Quartz Geode (likely within Limestone or Dolomite matrix)

Quartz (SiO₂)

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Agate (or Banded Agate)

Agate (a variety of Chalcedony, which is a cryptocrystalline form of Quartz); Chemical Formula: SiO₂ (Silicon Dioxide)

Shale (possibly)

Shale (fine-grained clastic sedimentary rock)

Quartz

Quartz (SiO₂)

Sandstone (likely a river or beach pebble)

Sandstone (a clastic sedimentary rock)

Quartz (Milky Quartz)

Quartz (SiO2 - Silicon Dioxide)

Caliche (also known as hardpan, calcrete, kankar)

Primarily composed of calcium carbonate (CaCO₃), often mixed with other minerals like quartz, clay minerals, and iron oxides.

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Amazonite

KAlSi3O8 (Potassium Feldspar, variety of Microcline)

Shale

Shale

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)

Shale

Shale (clastic sedimentary rock)

Sandstone

Sandstone (composed primarily of sand-sized minerals or rock grains)

Fossil Coral

Coral Limestone (a type of biogenic sedimentary rock)

Azurite-Malachite (often a mixed specimen)

Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2(CO3)(OH)2. The specimen appears to be a natural mixture or intergrowth of these two minerals.