Man Made Object (Simulant)

Obsidian

Volcanic Glass (Amorphous SiO2)

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide)

Red jasper pebble

Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides

Rose quartz beads

Quartz, silicon dioxide (SiO₂), pink variety

Obsidian

Volcanic Glass (Amorphous SiO2)

Obsidian

Volcanic Glass (felsic composition)

Larimar

Pectolite (NaCa2Si3O8(OH))

Rhodonite

Manganese Inosilicate (MnSiO3)

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

Amazonite

Amazonite (KAlSi3O8 – a variety of Microcline, a Potassium Feldspar)

Amazonite

Amazonite (KAlSi3O8 - a variety of Microcline Feldspar)

Lapis Lazuli (Lazurite crystals on Marble)

Lazurite / (Na,Ca)8[(S,Cl,SO4,OH)2|(AlSiO4)6]

Chert (Jasper/Flint variety)

Microcrystalline quartz (SiO2)

Beaded Jewelry (Assorted Gemstones)

Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ

Aventurine

Quartz (Aventurine variety)

Chert

Chert (microcrystalline quartz)

Tumbled green-brown stone, likely serpentine

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite

Chert (or Flint)

Chert (a cryptocrystalline variety of quartz, SiO2)

Red Jasper

Red Jasper (variety of Chalcedony, SiO₂)

Mixed polished gemstone bead lot, likely dyed agate and quartz

Chalcedony (microcrystalline quartz, SiO₂), with possible amethyst, aventurine, and other dyed quartz varieties

Black-and-white jasper

Jasper, microcrystalline quartz (SiO₂), with contrasting white mineral inclusions

Turquoise cabochon

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Smoky quartz (rough, water-worn crystal)

Quartz, silicon dioxide (SiO₂), smoky variety

Malachite

Malachite [Cu2CO3(OH)2]

Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')

Calcite (Calcium Carbonate, CaCO3)

Amazonite

Amazonite (KAlSi3O8) - a variety of Microcline Feldspar

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Serpentine (likely serpentinite)

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and chromite

Blue sodalite beads

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

Dyed blue howlite (turquoise imitation), possibly dyed magnesite

Howlite: Ca₂B₅SiO₉(OH)₅; the vivid blue color is artificial dye. Exact identification is uncertain from the photograph alone.

Tiger's Eye

Silicon dioxide (SiO2) with fibrous inclusions of crocidolite (riebeckite) that have been altered to limonite and then replaced by quartz

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Coal (most likely Bituminous or Anthracite)

Coal (primarily composed of carbon with varying amounts of other elements)

Jasper

Chalcedony (cryptocrystalline quartz), SiO2

Nephrite (a form of Jade)

Nephrite (a variety of the mineral actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)

White Jade / White Chalcedony

Nephrite Jade (Ca2(Mg,Fe)5Si8O22(OH)2) or Chalcedony (SiO2)

Calcite

Calcite (CaCO3)

Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)

Chert (microcrystalline quartz)

Larimar

Pectolite (a variety of pectolite, NaCa2Si3O8(OH))

Amazonite

KAlSi3O8 (Potassium Feldspar, variety of Microcline)

Jade (Nephrite or Jadeite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)

Cherry Creek Jasper (also known as Red Creek Jasper or Cherry Creek Agate)

Jasper, microcrystalline quartz (SiO₂)