Mineral Information and Data:

Andyrobertsite
KCdCu5(AsO4)4[As(OH)2O2] • 2H2O [CNMNC approved formula]

Named after Andrew C. Roberts (1950-), mineralogist with the Geological Survey of Canada, specialist in documentation of new mineral species, in particular from low-temperature secondary parageneses.

IMA status : Approved Species 1999 (IMA1997-022)
CLASSIFICATION 
Dana
(8th edition) :
42.09.02.03  (This Dana# Added)
  (42) Hydrated Phosphates Containing Hydroxyl or Halogen
  (42.09) where (A)3 (XO4)2 Zq · x(H2O)
  (42.09.02) Souzalite Group
  
Nickel-Strunz
(10th edition) :
08.DH.50
  (08) Phosphates, Arsenates, Vanadates
  (08.D) Phosphates, etc
  (08.DH) With large and medium-sized cations, (OH, etc.):RO4 < 1:1
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 9.81 Å, b = 10.034 Å, c = 9.975 Å, Z = 2; beta = 101.84°
Crystal Habit: crystals platy
  
Color: Royal blue.
Diaphaneity: Transparent
Luster: Vitreous
Measured Density: 4.011 g/cm3
Cleavage: {100} Good
Tenacity: Brittle
Fracture: Conchoidal
Streak: Pale blue
  
  
Synonyms/varieties: IMA1997-023

 

Andyrobertsite
Blue Andyrobertsite on Olivenite.
Origin: Tsumeb Mine (Tsumcorp Mine),
Tsumeb, Otjikoto (Oshikoto) Region, Namibia
Sample size: 4.1cm tall
Photo and owner © William Pinch

<<< BACK TO MINERAL SEARCH