From Ohio History Central

The name of this mineral comes from the Greek language and refers to the six (hexa-) elemental groups of water (hydrite) (H2O) with each elemental group of magnesium sulfate (MgSO4).


Luster:Vitreous, silky, to dull
Occurence:<img width="195" height="172" title="Map of haxahydrite occurence" alt="Map of hexahydrite occurence" src="images/naturalHistory/minerals/hexahydritemap.gif" />


Hexahydrite first was found in the Lillooet district of British Columbia, Canada. In Ohio it has been reported from 8 counties.

Hexahydrite is common in Ohio as as efflorescence, especially on dolostone in the western part of the state.


  • Carlson, Ernest H., ed. Minerals of Ohio; Ohio Division of Geological Survey, Columbus, OH; Bulletin 69; 1991.
  • Pough, Frederick H. A Field Guide to Rocks and Minerals; Houghton Mifflin, Boston, MA; 1976.
  • Sorrell, Charles A. Rocks and Minerals; Golden Press, New York, NY; 1973.

See Also