Mineral Information and Data:

Mercallite
KHSO4 [CNMNC approved formula]

Named for Giuseppe Mercalli (1850-1914), Italian Geologist, director of the Vesuvius Observatory.

IMA status : Valid species (Pre-IMA 1935) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
28.01.01.01  
  (28) Anhydrous Acid and Sulfates
  (28.01) (Anhydrous, Acid)
  (28.01.01)
  
Nickel-Strunz
(10th edition) :
07.AD.10
  (07) Sulfates (selenates, tellurates, chromates, molybdates, wolframates)
  (07.A) Sulfates (selenates, etc.) without Additional Anions, without H2O
  (07.AD) With only large cations
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
  
  
  
Other Properties: H2O Soluble.

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