Mineral Information and Data:

Starkeyite
MgSO4 • 4H2O [CNMNC approved formula]

Named for the locality: Starkey mine, Madison Co., Missouri, USA.

IMA status : Approved Species 1956 ()
CLASSIFICATION 
Dana
(8th edition) :
29.06.06.02  
  (29) Hydrated Acid and Sulfates
  (29.06) where A XO4 · x(H2O)
  (29.06.06) Rozenite Group (Monoclinic)
  
Nickel-Strunz
(10th edition) :
07.CB.15
  (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: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  
Other Properties: H2O Soluble.

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