Apophyllite

The name apophyllite refers to a specific group of phyllosilicate minerals, a class of minerals that also includes the micas. Originally, the group name referred to a specific mineral, but was redefined in 1978 to stand for a class of minerals of similar chemical makeup that comprise a solid solution series, and includes the members fluorapophyllite, hydroxyapophyllite, and natroapophyllite. The name apophyllite is derived from the Greek apophylliso, meaning "it flakes off," a reference to this class's tendency flake apart when heated, due to water loss. These minerals are typically found as secondary minerals in basalt.
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(n.)
A mineral relating to the zeolites, usually occurring in square prisms or octahedrons with pearly luster on the cleavage surface. It is a hydrous silicate of calcium and potassium.
  

General Information:
 Chemical Formula:
KCa4(Si4O10)2F·8(H2O)
 Composition:
(Molecular Weight = 907.20 gm)
Potassium 4.31 % K 
Calcium 17.67 % Ca
Silicon 24.77 % Si
Hydrogen 1.78 % H 
Oxygen 49.38 % O 
Fluorine 2.09 % F 
 Empirical Formula:
KCa4(Si4O10)2F·8(H2O)
 Environment:
Secondary mineral in basalts.
 IMA Status:
Not IMA Approved
 Locality:
Lonault and Poona, southeast of Bombay, India.
 Name Origin:
From the Greek apophylliso - "it flakes off."
Physical Properties:
 Cleavage:
[001] Perfect
 Color:
white, pink, green, yellow, or violet.
 Density:
2.3 - 2.4, Average = 2.34
 Diaphaniety:
Transparent to translucent
 Habits:
Crystalline - Coarse - Occurs as well-formed coarse sized crystals., Pseudo Cubic - Crystals show a cubic outline., Massive - Uniformly indistinguishable crystals forming large masses .
 Hardness:
4-5 - Fluorite-Apatite
 Luminescence:
None.
 Luster:
Vitreous - Pearly
 Streak:
white
More details...

General Information:
 Chemical Formula:
(K,Na)Ca4Si8O20(F,OH)·8(H2O)
 IMA Status:
Approved IMA
 Name Origin:
From the Greek apophylliso - "it flakes off."
Physical Properties:
 Cleavage:
[001] Perfect
 Color:
white, pink, green, yellow, or violet.
 Density:
2.3 - 2.4, Average = 2.34
 Diaphaniety:
Transparent to Translucent
 Habits:
Crystalline - Coarse - Occurs as well-formed coarse sized crystals., Pseudo Cubic - Crystals show a cubic outline., Massive - Uniformly indistinguishable crystals forming large masses .
 Hardness:
4-5 - Fluorite-Apatite
 Luminescence:
None.
 Luster:
Vitreous - Pearly
 Streak:
white
More details...

General Information:
 Chemical Formula:
KCa4Si8O20(OH,F)·8(H2O)
 IMA Status:
Approved IMA 1978
 Name Origin:
From the Greek apophylliso - "it flakes off."
Physical Properties:
 Cleavage:
[001] Perfect
 Color:
white, pink, green, yellow, or violet.
 Density:
2.3 - 2.4, Average = 2.34
 Diaphaniety:
Transparent
 Habits:
Crystalline - Coarse - Occurs as well-formed coarse sized crystals., Pseudo Cubic - Crystals show a cubic outline., Massive - Uniformly indistinguishable crystals forming large masses .
 Hardness:
4-5 - Fluorite-Apatite
 Luminescence:
None.
 Luster:
Vitreous - Pearly
 Streak:
white
More details...

APOFILLITE

B: (Kimia) apofilit
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