Man Made Material (Anthropogenic 'Mineraloid')

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various metal oxide impurities

Fossiliferous Limestone

Limestone (composed primarily of calcite with included fossils CaCO3)

Chert

Chert (microcrystalline quartz)

Obsidian

Obsidian (volcanic glass, amorphous silica rich rock)

Polished white chalcedony or milky quartz pebble

Chalcedony, microcrystalline quartz (SiO₂), possibly with iron-oxide staining or a minor mineral inclusion

Blue Slag Glass

Amorphous Silica (Industrial byproduct)

Mixed Gemstone Beaded Jewelry

Various minerals (e.g., Quartz varieties like Rose Quartz, Amethyst; Peridot; Garnet; etc.)

Ferrosilicon Slag (Industrial Vitrified Glass)

Vitreous Silicate Residue

Red Swirl Beads (Likely Resin or Glass, simulating Red Jasper or Agate)

N/A (for the beads as pictured); Red Jasper: SiO2 (Chert variety); Red Agate: SiO2 (Chalcedony variety)

Amber

Succinite (fossilized tree resin)

Chert (variant of Flint)

Chert (SiO2)

Rose Quartz Carving

Quartum roseum (Variety of Quartz, SiO2)

Agate (specifically, multi-colored or pastel-dyed agate)

Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).

Goldstone

Aventurine Glass (SiO2 + Cu small inclusions)

Blue Goldstone

Aventurine Glass (Silicon Dioxide with metal inclusions)

Diamond Plate (Steel)

Alloyed Carbon Steel or Aluminum with 'Durbar' pattern

Green Aura Quartz (Titanium treated Kyanite or Quartz)

Silicon Dioxide (SiO2) or Aluminum Silicate (Al2SiO5) with Titanium/Metal Oxide coating

Synthetic Blue Aura Quartz

Silicon Dioxide (SiO2) with Metallic Infusion

Slag Glass (Cullet)

Amorphous Silica / Glass residue

Blue Goldstone

Aventurine Glass

Synthetic Costume Glove (Paws)

Polyethylene terephthalate (Polyester) & Polyurethane blend

Glazed Ceramic Tile

Fused Silicate-Clay composite

Quartz

Silicon Dioxide (SiO₂)

Polymictic breccia, possibly volcanic breccia

Polymictic clastic breccia; likely a matrix-supported breccia containing lithic fragments, quartz, feldspar, and dark mafic minerals

Lapis Lazuli

A metamorphic rock primarily composed of lazurite (Na,Ca)8[(S,SO4,Cl)2|(Al6Si6O24)], calcite (CaCO3), and pyrite (FeS2).

United States Quarter Dollar

Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)

Weathered pegmatite or feldspar-rich granite fragment

Granitic pegmatite, composed mainly of potassium feldspar and quartz, with minor mica; exact identification is uncertain from the photograph

Bumblebee Jasper

Anhydrite-Aragonite mixture with Orpiment and Realgar

Chert (or possibly Flint)

Chert (variant: Flint)

Chert (Flint)

Silicon Dioxide (SiO2)

Metallic Ornament / Jewelry

N/A - This is an artificial object, not a geological specimen.

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide with impurities)

Black Obsidian

Volcanic Glass (Amorphous Silicon Dioxide)

Obsidian

Volcanic Glass (SiO2)

Limonite (Iron Ore)

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

Obsidian

Amorphous volcanic glass (SiO2)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Limonite (Iron Stone/Goethite)

Limonite (mixture of hydrated iron oxides, primarily Goethite: α-FeO(OH))

Limonitic Iron Ore / Goethite

Hydrated Iron(III) oxide-hydroxide (primarily FeO(OH)·nH2O)

Amber

Succinite (with a generalized formula of C10H16O)

Black Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

Limonite (Ironstone) Concretion

FeO(OH)·nH2O (Hydrous ferric oxide)