General Information:
Chemical Formula:MgSO4·7(H2O)
Composition:(Molecular Weight = 246.48 gm)Magnesium 9.86 %
MgHydrogen 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
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