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Charoite

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Chemical Formula:

K5Ca8(Si6O15)2(Si2O7)Si4O9(OH)•3(H2O)

 Composition:

Molecular Weight = 1,828.68 gm

 

 Potassium  10.69 %  K    12.88 % K2O

 

 Calcium    17.53 %  Ca   24.53 % CaO

 

 Silicon    27.65 %  Si   59.14 % SiO2

 

 Hydrogen    0.39 %  H     3.45 % H2O

 

 Oxygen     43.75 %  O

 

           ______        ______ 

 

           100.00 %      100.00 % = TOTAL OXIDE

 Empirical Formula:

K5Ca8Si18O46(OH)•3(H2O)

 Environment:

Occurs within a syenite massif, in metasomatic rocks, formed between 200-250 deg. C and enriched with K at the contact of the massif with limestone.

Cleavage:

{???} Good, {???} Good, {???} Good

 Color:

Violet, Lilac, Light brown.

 Density:

2.54 - 2.58, Average = 2.56

 Diaphaneity:

Translucent

 Habit:

Massive - Fibrous - Distinctly fibrous fine-grained forms.

 Hardness:

5-6 - Between Apatite and Orthoclase

 Luminescence:

Weakly Fluorescent. Orange cathodeluminescent, Short UV=pale blue, Long UV=pale blue.

 Luster:

Vitreous - Pearly

 Streak:

white

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