General Information:
Chemical Formula:
(Ca0.5,Na)0.33(Mg,Fe++)3Si4O10(OH)2·n(H2O)
Composition:
(Molecular Weight = 471.23 gm)
Sodium 1.61 % Na
Calcium 1.28 % Ca
Magnesium 14.44 % Mg
Iron 2.37 % Fe
Silicon 23.84 % Si
Hydrogen 2.14 % H
Oxygen 54.32 % O
Empirical Formula:
Ca0.15Na0.33Mg2.8Fe2+0.2Si4O10OH2·4(H2O)
IMA Status:
Approved IMA 1962
Locality:
Railway tunnel, Bergen Hill, Hudson County, New Jersey, USA.
Name Origin:
Named for E. A. Stevens, founder of Stevens Institute of Technology, Hoboken, New Jersey, USA.
Physical Properties:
Cleavage:
[001] Perfect
Color:
beige white, yellow brown, or pink.
Density:
2.15 - 2.75, Average = 2.45
Diaphaniety:
Translucent
Habits:
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Fibrous - Crystals made up of fibers.,
Hardness:
4 - Fluorite
Luminescence:
Non-fluorescent.
Luster:
Resinous
Streak:
white
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