Augelite
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Augelite
Augelite
Augelite-78938.jpg
General
CategoryPhosphate mineral
Formula
(repeating unit)
Al2(PO4)(OH)3
Strunz classification8.BE.05
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupC2/m
Unit cella = 13.124(6), b = 7.988(5)
c = 5.0633(3) [Å]
? = 112.25(2)°; Z = 4
Identification
ColorColorless to white, may be yellowish to pale rose, greenish
Crystal habitTabular to prismatic or acicular crystals; massive
CleavagePerfect on {110}, good on {201}, imperfect on {001} and {101}
FractureUneven
TenacityBrittle
Mohs scale hardness4 - 4.5
LusterVitreous, pearly on {110} cleavage
StreakWhite
DiaphaneityTransparent
Specific gravity2.696
Optical propertiesBiaxial (+)
Refractive indexn? = 1.574 n? = 1.576 n? = 1.588
Birefringence? = 0.014
2V angleMeasured: 50°
References[1][2]

Augelite is an aluminium phosphate mineral with formula: Al2(PO4)(OH)3. The shade varies from colorless to white, yellow or rose. Its crystal system is monoclinic.[3]

It was first described by Christian Wilhelm Blomstrand for an occurrence in Västanå iron mine at Scania, Sweden in 1868 and derives its name from the Greek ? in reference to its pearly lustre.[1][2]

It occurs as a product of metamorphism of phosphate bearing peraluminous sediments and in high-temperature hydrothermal ore deposits. It occurs in association with attakolite, svanbergite, lazulite, hematite, trolleite, berlinite, rutile, pyrophyllite, baryte, arsenopyrite, stannite, pyrite, andorite, cassiterite and zinkenite.[1]

References

  1. ^ a b c Handbook of Mineralogy
  2. ^ a b Mindat.org
  3. ^ Richard V. Gaines, H. Catherine W. Skinner, Eugene E. Foord, Brian Mason, and Abraham Rosenzweig: "Dana's new mineralogy", p. 851. John Wiley & Sons, 1997
Augelite from the Dawson Mining District, Yukon, Canada

  This article uses material from the Wikipedia page available here. It is released under the Creative Commons Attribution-Share-Alike License 3.0.

Augelite
 



 



 
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