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nf. stilbite, desmine, A common mineral of the zeolite family, hydrous silicate of alumina and lime

(n.)
A common mineral of the zeolite family, a hydrous silicate of alumina and lime, usually occurring in sheaflike aggregations of crystals, also in radiated masses. It is of a white or yellowish color, with pearly luster on the cleavage surface. Called also desmine.
  

General Information:
 Chemical Formula:
NaCa4[Al8Si28O72·n(H2O) (n=28-32)
 Composition:
(Molecular Weight = 2,877.96 gm)
Sodium 0.80 % Na
Calcium 5.57 % Ca
Aluminum 7.50 % Al
Silicon 27.32 % Si
Hydrogen 2.10 % H 
Oxygen 56.70 % O 
 Empirical Formula:
NaCa4Al8Si28O72·30(H2O)
 Environment:
Amygdaloidal cavities in basalts and similer rocks.
 Locality:
Trentino, Italy.
 Name Origin:
From the Greek stilbe - "luster" in allusion to the pearly to vitreous luster.
Physical Properties:
 Cleavage:
[010] Perfect
 Color:
white, red, yellow, brown, or cream.
 Density:
2.1 - 2.2, Average = 2.15
 Diaphaniety:
Transparent to Subtransparent to translucent
 Habits:
Wheat Sheaf - Bundle shaped aggregates resembling wheat sheafs after hand reaping wheat., Fibrous - Crystals made up of fibers., Globular - Spherical, or nearly so, rounded forms (e.g . wavellite).
 Hardness:
3.5-4 - Copper Penny-Flourite
 Luminescence:
None.
 Luster:
Vitreous - Pearly
 Streak:
white
More details...

General Information:
 Chemical Formula:
(Sb,Ca,Na)2(Ta,Nb)2(O,OH)7
 IMA Status:
Approved IMA
Physical Properties:
 Color:
white or white.
 Diaphaniety:
Translucent to Opaque
 Hardness:
4 - Fluorite
 Luster:
Vitreous (Glassy)
 Streak:
white
More details...

General Information:
 Chemical Formula:
(Sb,Ca,Na)2(Ta,Nb)2(O,OH)7
 IMA Status:
Approved IMA
Physical Properties:
 Color:
white or white.
 Diaphaniety:
Translucent to Opaque
 Hardness:
4 - Fluorite
 Luster:
Vitreous (Glassy)
 Streak:
white
More details...

stilbite

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