Man Made Object (Metalwork)

Obsidian

Obsidian (volcanic glass), predominantly amorphous SiO₂

Onyx

Onyx (a variety of Chalcedony, SiO₂)

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Iron Meteorite

Iron-Nickel Meteorite (primarily composed of kamacite and taenite alloys)

Amethyst cluster

Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron-related defects

Amethyst

SiO2 (Silicon Dioxide)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Anthracite Coal

Anthracite (high-rank coal)

Amber

Fossilized tree resin (not a true mineral as it is organic and amorphous); Chemical formula is highly variable, but often approximated as C10H16O.

Green Aventurine

Quartz (Aventurine variety) - SiO₂ with Fuchsite inclusions

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Rutilated Quartz

SiO2 (Quartz) with TiO2 (Rutile inclusions)

Green Aventurine

Aventurine (a variety of Quartz, SiO2 with fuchsite inclusions)

Cullet Glass (Industrial Slag Glass)

Amorphous Silica (SiO2) with metallic oxide impurities

Amazonite

Amazonite (KAlSi3O8, a variety of Microcline)

Quartz (Pebble)

Quartz (SiO₂)

Carved serpentine wing sculpture

Serpentine-group rock, chiefly antigorite/lizardite: Mg3Si2O5(OH)4

Green Aventurine and Clear Quartz

Aventurine (variety of Quartz - SiO2) and Quartz (SiO2)

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite, Sodalite, Calcite, and Pyrite)

Bornite (peacock ore), likely with chalcopyrite

Bornite, Cu5FeS4; associated copper sulfides may include chalcopyrite, CuFeS2

Chrysoprase

Chalcedony (cryptocrystalline quartz) with nickel inclusions; SiO2

Peacock ore (iridescent chalcopyrite, possibly bornite)

Chalcopyrite, CuFeS₂; the iridescent surface may be natural tarnish or artificial acid treatment. Similar material is bornite, Cu₅FeS₄.

Tumbled orange chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; iron-bearing variety commonly termed carnelian

Polished green serpentine (likely antigorite-rich)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible chlorite, magnetite, and talc

Glazed Ceramic Tile

Fused Silicate-Clay composite

Polished white chalcedony or milky quartz pebble

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

Carnelian

Carnelian (a variety of Chalcedony, which is a microcrystalline quartz, SiO₂)

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite)

Tiger's Eye

Tiger's Eye (a variety of Chalcedony, which is a microcrystalline quartz with fibrous inclusions of oxidized crocidolite)

Green Aventurine

Aventurine (a variety of Quartz, SiO2)

Red Jasper

Jasper (a variety of Quartz, SiO2)

Agate

SiO2 (Silicon dioxide, chalcedony variety)

Red Jasper (beads)

SiO₂ (Silicon Dioxide)

Calcite

Calcite (CaCO₃)

Calcite

Calcite (CaCO₃, Calcium Carbonate)

Red Jasper (possibly)

Jasper (a variety of Chalcedony, SiO2)

Aventurine (likely Green Aventurine)

Quartz (SiO2) with included minerals (Fuchsite or Chlorite for green color)

Tumbled carnelian agate with dark mineral inclusions

Carnelian, an orange variety of microcrystalline quartz (chalcedony), SiO₂; dark inclusions are likely iron oxides/hydroxides, possibly hematite, goethite, or a basaltic/matrix fragment

Basalt

Basalt

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2, with varying amounts of Calcite, Pyrite, and Sodalite).

Rose Quartz

Rose Quartz (SiO₂)

Quartz (in matrix)

Quartz (SiO₂)