Mineral Information and Data:

Baylissite
K2Mg(CO3)2 • 4H2O [CNMNC approved formula]

Named for Noel Stanley Bayliss, Professor of Chemistry, University of Western Australia, Nedlands, Western Australia, who characterized the synthetic compound.

IMA status : Approved Species 1976 (IMA1975-024)
CLASSIFICATION 
Dana
(8th edition) :
15.02.04.01  
  (15) Hydrated Carbonates
  (15.02) where A+m B++n (XO3)p · x(H2O), (m+n):p > 1:1
  (15.02.04)
  
Nickel-Strunz
(10th edition) :
05.CB.45
  (05) Carbonates and Nitrates
  (05.C) Carbonates without Additional Anions, with H2O
  (05.CB) With large cations (alkali and alkali-earth carbonates)
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Space group: P21/n
Unit cell: a = 11.404(4)Å, b = 6.228(2)Å, c = 6.826(2)Å; β = 99.66(2)°
Crystal Habit: In fine-grained crusts of anhedral crystals.
Twinning: Polysynthetic, probably universal
  
Color: Colorless
Diaphaneity: Transparent to translucent
Hardness (Mohs): 2 - 3
Measured Density: 2.04 (calculated) g/cm3
  
Geologic Setting: A secondary mineral in fractures in aplite granite and granodiorite.
Mineral Association: Grimselite, schr¨ockingerite, calcite, monohydrocalcite
  
Other Properties: H2O Soluble.
Comments: Decomposes in H2O and in a humid atmosphere.

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