Mineral Information and Data:

Pentahydrite
MgSO4 • 5H2O [CNMNC approved formula]

Named from the Greek, penta, "five" and hydros "water" in allusion to the 5 water molecules in the formula.

IMA status : Valid species (Pre-IMA 1951) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
29.06.07.03  
  (29) Hydrated Acid and Sulfates
  (29.06) where A XO4 · x(H2O)
  (29.06.07) Chalchanthite Group (Triclinic: P-1)
  
Nickel-Strunz
(10th edition) :
07.CB.20
  (07) Sulfates (selenates, tellurates, chromates, molybdates, wolframates)
  (07.C) Sulfates (selenates, etc.) without Additional Anions, with H2O
  (07.CB) With only medium-sized cations
  
Crystal system: Triclinic System
Point group (H-M): 1 — pinacoidal
  
  
  
Other Properties: H2O Soluble.

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