Mineral Information and Data:

Antarcticite
CaCl2 • 6H2O [CNMNC approved formula]

Named for its occurrence on the continent of Antarctica.

IMA status : Approved Species 1965 (IMA1965-015)
CLASSIFICATION 
Dana
(8th edition) :
09.02.06.01  
  (09) Anhydrous and Hydrated Halides
  (09.02) where A (X)2
  (09.02.06)
  
Nickel-Strunz
(10th edition) :
03.BB.30
  (03) Halides
  (03.B) Simple Halides, with H2O
  (03.BB) M:X = 1:2
  
Crystal system: Trigonal System
Point group (H-M): 32 — trapezoidal
Unit cell: a = 7.89-7.907 Å, c = 3.95 Å
Crystal Habit: Large acicular aggregates
  
Color: Colorless
Diaphaneity: Transparent
Luster: Vitreous
Hardness (Mohs): 2 - 3
Measured Density: 1.72 g/cm3
Cleavage: {0001} perfect
Tenacity: Brittle
Streak: White
  
Geologic Setting: A precipitate from highly saline brines under very arid conditions (Don Juan Pond, Antarctica; Bristol Dry Lake, California, USA); in stratified fresh to brackish to salt water columns in onshore “blue holes” (North Andros Island, Bahamas); an abundant component of inclusions in quartz in a zoned mafic pegmatoid (Bushveld complex, South Africa).
Mineral Association: Halite, gypsum, celestine (Bristol Dry Lake, California, USA)
  
Comments: Highly hygroscopic.

 

Antarcticite
White antarcticite crystals sealed in mineral oil.
Origin: Bristol Lake, Mojave Co.,California, USA.
Sample size: Sample Jar 6 cm
Photo: Diederik Visser

<<< BACK TO MINERAL SEARCH