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Adamite is one of the most well known minerals in the specimen market although the mineral itself is not terribly common. Cut gemstones are rare because of its low hardness (3 1/2), brittle tenacity, and distinct cleavage. It is highly prized for its aesthetic crystal shapes and formations, bright color (often a yellow to greenish-yellow), and stunning fluorescence (bright lime green).

Adamite Rough
Adamite Classification
Common Name Adamite
Species Adamite
Adamite Optical Properties
Transparency Opaque-Transparent
Dispersion Strength: Strong Fire
Refractive Index 1.708-1.773
Birefringence 0.055
Optic Character Biaxial
Optic Sign Positive or Negative
Fluorescence SWUV: strong lime green
LWUV: strong lime green
Pleochroism Varies based on color
Adamite Characteristic Physical Properties
Hardness 3.5
Streak white
Specific Gravity 4.320 - 4.480
Luster Vitreous
Fracture irregular, uneven, subconchoidal
Cleavage good
Adamite Chemistry & Crystallography
Chemical Name zinc arsenate hydroxide
Chemical Formula Zn2(AsO4)(OH)
Crystal System Orthorhombic
Chemistry Classification Phosphate

Adamite Colors

  • Blue Adamite Blue
  • Yellow Adamite Yellow
  • Green Adamite Green
  • Brown Adamite Brown
  • Pink Adamite Pink
  • Purple Adamite Purple
  • Colorless Adamite Colorless
  • White Adamite White
  • Yellow Adamite Yellow
  • Red Adamite Red

Countries of Origin


Sisk Gemology Reference

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Tim Matthews


Tim Matthews

Tim Matthews is President and Chief Executive Officer of Jewelry Television® (JTV), as well as a member of the company's Board of Directors. He oversees and leads all aspects of the company's powerful omni-digital retail platform that uniquely specializes in fine jewelry and gemstones. His passion for business and gemstones has led him to become a recognized expert in the field of gemology. He is a life member of the Gemmological Association of Great Britain (Gem-A) and has earned Gem-A's highest degrees, the Gemmology (FGA) and Diamond (DGA) diplomas. He is also a Graduate Gemologist (GG) of the Gemological Institute of America (GIA) and has also completed GIA's Graduate Diplomas in Diamonds, Colored Stones and Pearls. Under his leadership, JTV has become the leader in the sourcing and selling of color gemstones and jewelry.

This page was created on June 27, 2014.

This page was last edited on October 24, 2019.