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Article: Amazonite


Physical Properties

  • Hardness: 6.0-6.5
  • Luster: Vitreous
  • Streak: White
  • Diaphaneity: Translucent, opaque
  • Specific gravity: 2.56-2.58

Chemical Composition

  • Chemical formula: KAlSi
  • Polymorphic to orthoclase
  • Potassium feldspar called microcline
  • Unknown if stones from the Amazon River were amazonite
  • No ancient or medieval authority mentions amazonite

Color and Varieties

  • Green and greenish-blue varieties are designated as amazonite
  • Described as bright verdigris-green and possessing a lively green color
  • Occasionally cut and used as a gemstone
  • Color may be the aggregate effect of several factors
  • Studies suggest the role of lead, rubidium, thallium, and divalent iron in coloration


  • Limited occurrence in Bronze Age Egypt and Miass, Russia
  • Source of color was a mystery for many years
  • Blue-green color may result from lead and water in the feldspar
  • Aliovalent lead may play a role in the color of microcline
  • Increasing content of lead, rubidium, and thallium associated with color variations

Health Concerns

  • Lead leakage from amazonite into an acidic solution exceeded recommended amount
  • Experiment simulated a child swallowing amazonite
  • Applicable to new wellness practices such as inserting the mineral into oils or drinking water
  • Potential health risks associated with high lead content
  • Further studies needed to understand the health implications of amazonite

Amazonite Data Sources

Reference URL
Knowledge Graph

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