Mineral Information and Data:

Heidornite
Na2Ca3B5O8(SO4)2(OH)2Cl [CNMNC approved formula]

Named for F. Heidorn, German geologist who studied the Zechstein deposits.

IMA status : Valid species (Pre-IMA 1956) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
32.03.05.01  
  (32) Compound Sulfates
  (32.03) (anhydrous) with poly-anionic formula
  (32.03.05)
  
Nickel-Strunz
(10th edition) :
06.EC.30
  (06) Borates
  (06.E) Pentaborates
  (06.EC) Phyllo-pentaborates
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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