Juanite

General Information:
 Chemical Formula:
Ca10Mg4Al2Si11O39·4(H2O) (?)
 Composition:
(Molecular Weight = 1,556.94 gm)
Calcium 25.74 % Ca
Magnesium 6.24 % Mg
Aluminum 3.47 % Al
Silicon 19.84 % Si
Hydrogen 0.52 % H 
Oxygen 44.19 % O 
 Empirical Formula:
Ca10Mg4Al2Si11O39·4(H2O)
 Environment:
Alteration product of melilite.
 Locality:
Iron Hill, Powderhorn-Cebolla district, Gunnison County, Colorado. USA.
 Name Origin:
Named for the San Juan Mountains, Colorado, USA.
Physical Properties:
 Color:
white, pistachio green, or brown.
 Density:
3.01 - 3.28, Average = 3.14
 Diaphaniety:
Translucent
 Habits:
Fibrous - Crystals made up of fibers., ,
 Hardness:
5.5 - Knife Blade
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