Mineral Information and Data:

Ashburtonite
HCu4Pb4Si4O12(HCO3)4(OH)4Cl [CNMNC approved formula]

Named for the locality: Anticline prospect, on Mineral Claim 84, which is on the Ashburton Downs pastoral lease, 11.2 km west-southwest of Ashburton Downs homestead.

IMA status : Approved Species 1989 (IMA1990-033)
CLASSIFICATION 
Dana
(8th edition) :
78.04.02.01  
  (78) Unclassified silicates
  (78.04) possible inosilicates
  (78.04.02)
  
Nickel-Strunz
(10th edition) :
09.CF.05
  (09) Silicates
  (09.C) Cyclosilicates
  (09.CF) [Si4O12]8- 4-membered single rings, with insular complex anions
  
Crystal system: Tetragonal System
Point group (H-M): 4/m — dipyramidal
Unit cell: a = 14.23Å, c = 6.1Å
Crystal Habit: Prismatic along [001], to 0.4 mm, showing {110}, {100}, {001}, and {301}.
  
Color: Blue
Luster: Vitreous
Measured Density: 4.69 (calculated) g/cm3
Tenacity: Brittle
Fracture: Conchoidal
Streak: Light blue
  
Geologic Setting: In a weathered shear zone cutting shales and graywackes, as an alteration of galena and probably chalcopyrite.
Mineral Association: Diaboleite, duftite, beudantite, caledonite, plattnerite, cerussite, malachite, brochantite
  

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