Epsomite

Epsomite is a hydrous magnesium sulfate mineral with formula MgSO4·7H2O or simply MgSO4. Epsomite forms as encrustations or efflorescences on limestone cavern walls and mine timbers and walls, as a volcanic fumaroles, and as rare beds in evaporite layers. It was first systematically described in 1806 for an occurrence near Epsom, Surrey, England, for which it was named.
See more at Wikipedia.org...

(n.)
Native sulphate of magnesia or Epsom salt.
  

General Information:
 Chemical Formula:
MgSO4·7(H2O)
 Composition:
(Molecular Weight = 246.48 gm)
Magnesium 9.86 % Mg
Hydrogen 5.73 % H 
Sulfur 13.01 % S 
Oxygen 71.40 % O 
 Empirical Formula:
Mg(SO4)·7(H2O)
 Environment:
White efflorescence on cave walls, volcanic exhalations, or deposited by Mg sulfate spring waters.
 Locality:
Lake-bed deposits on Kruger Mountain, Oregon.
 Name Origin:
The mineral has long been known from the deposits associated with the mineral waters at Epsom, Surrey, England.
Physical Properties:
 Cleavage:
[010] Perfect, [101] Distinct
 Color:
colorless, white, yellowish white, greenish white, or pinkish white.
 Density:
1.67 - 1.68, Average = 1.67
 Diaphaniety:
Transparent to translucent
 Habits:
Fibrous - Crystals made up of fibers., Acicular - Occurs as needle-like crystals., Encrustations - Forms crust-like aggregates on matrix.
 Hardness:
2-2.5 - Gypsum-Finger Nail
 Luminescence:
None.
 Luster:
Vitreous (Glassy)
 Streak:
white
More details...

B: (Kimia) epsomit
Built to Babylon by Hikmat Gumilar Visit my Website;