Adamite

Adamite was named after the French mineralogist Gilbert-Joseph Adam, who discovered the mineral at Chañarcillo, Copiapó Province, Atacama Region, Chile.

Adamite forms transparent to translucent pale yellow through green to bluish green elongated crystals and radial aggregates. Yellow color is due to Fe compounds, tints of green are connected with the presence of copper and purple colour is caused by cobalt content. Reddish to pink and violet transparent crystals have been reported from Mexico.

Large individual clear crystals can be cut into attractive faceted stones.



Adamite Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 
 
 

Adamite Gemstones by Size

This table shows distribution of Adamite gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:0.47 cts
Heaviest:4.61 cts
Average:1.75 cts
Total photos:6
Do you have a larger Adamite? Why not upload a photo?
0.47ct to 0.88ct0.88ct to 1.30ct1.30ct to 1.71ct1.71ct to 2.13ct2.13ct to 2.54ct2.54ct to 2.95ct2.95ct to 3.37ct3.37ct to 3.78ct3.78ct to 4.20ct4.20ct to 4.61ct
General Information
Chemical Formula
Zn
 
2
(AsO
 
4
)(OH)
Michael O’Donoghue, Gems, Sixth edition (2006)
Photos of natural/un-cut material from mindat.org
Physical Properties of Adamite
Mohs Hardness3.5
Walter Schumann, Gemstones of the world (2001)
More from other references
Specific Gravity4.30 to 4.68
Walter Schumann, Gemstones of the world (2001)
More from other references
Cleavage QualityDistinct
Arthur Thomas, Gemstones (2009)
FractureConchoidal
Arthur Thomas, Gemstones (2009)
Optical Properties of Adamite
Refractive Index1.708 to 1.773
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
Optical CharacterBiaxial/+,-
Michael O’Donoghue, Gems, Sixth edition (2006)
More from other references
Birefringence0.031 to 0.050
Michael O’Donoghue, Gems, Sixth edition (2006)
More from other references
PleochroismNil
Arthur Thomas, Gemstones (2009)
DispersionStrong
Arthur Thomas, Gemstones (2009)
Colour
Colour (General)Yellow-green, brownish, colourless, pink, violet.
Walter Schumann, Gemstones of the world (2001)
More from other references
TransparencyTransparent,Translucent
Michael O’Donoghue, Gems, Sixth edition (2006)
LustreVitreous
Walter Schumann, Gemstones of the world (2001) Strong vitreousMore from other references
Fluorescence & other light emissions
Fluorescence (Short Wave UV)Adamite may show an intense yellow or green fluorescence with lemon-yellow phosphorescence under SWUV.
Michael O’Donoghue, Gems, Sixth edition (2006)
PhosphorescenceLemon-yellow phosphorescence under SWUV
Michael O’Donoghue, Gems, Sixth edition (2006)
Crystallography of Adamite
Crystal SystemOrthorhombic
Walter Schumann, Gemstones of the world (2001)
More from other references
HabitElongated orthorhombic crystals and radial aggregates.
Michael O’Donoghue, Gems, Sixth edition (2006)
More from other references
Geological Environment
Where found:Adamite occurs as a secondary mineral in the oxidized zone of zinc- and arsenic-bearing hydrothermal mineral deposits.
Michael O’Donoghue, Gems, Sixth edition (2006)
Further Information
Mineral information:Adamite information at mindat.org
Significant Gem Localities
Greece
 
  • Attica
    • East Attica
      • Lavreotiki
Mexico
 
  • Durango
      • Mapimí
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 377
Namibia
 
  • Oshikoto Region
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