Mineral Information and Data:

Bischofite
MgCl2 • 6H2O [CNMNC approved formula]

Named for Karl Bischof, German mineralogist.

IMA status : Valid species (Pre-IMA 1877) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
09.02.09.01  
  (09) Anhydrous and Hydrated Halides
  (09.02) where A (X)2
  (09.02.09) Bischofite Group
  
Nickel-Strunz
(10th edition) :
03.BB.15
  (03) Halides
  (03.B) Simple Halides, with H2O
  (03.BB) M:X = 1:2
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 9.8607Å, b = 7.1071Å, c = 6.0737Å β = 93.758°
Crystal Habit: Crystals short prismatic; granular, foliated, fibrous
Twinning: May twin polysynthetically under pressure.
  
Color: Colorless, white
Diaphaneity: Transparent to translucent
Luster: Vitreous to dull
Hardness (Mohs): 1 to 2
Measured Density: 1.56 g/cm3
Fracture: Irregular/Uneven, Conchoidal
Streak: White
  
Geologic Setting: In saline deposits; probably in part secondary, formed from carnallite.
Mineral Association: Carnallite, halite, kieserite
  
Synonyms/varieties: Bischofite (of Ochsenius)
Other Properties: H2O Soluble.
Comments: Deliquescent; taste astringent, bitter.

 

Bischofite
Colorless grains of Bischofite. The mineral is very hygroscopic and must be stored in a closed vial. The photo was made through the vial.
Origin: Stassfurt, Stassfurt Deposit, Saxony-Anhalt, Germany
Picture size: 5 mm
Photo and Owner: Thomas Witzke

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