Apophyllite

General Information: Chemical Formula:KCa4(Si4O10)2F·8(H2O) Composition:(Molecular Weight = 907.20 gm)Potassium 4.31 % K Calcium 17.67 % CaSilicon 24.77 % SiHydrogen 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:whiteMore 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:whiteMore 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:whiteMore details...