Definition of Afghanite

Mineralogy Database

Afghanite

General Information:

Chemical Formula:
(Na,Ca,K)8(Si,Al)12O24(SO4,Cl,CO3)3·(H2O)

Environment:
Generally associated with sodalite-group minerals.

IMA Status:
Approved IMA 1968

Locality:
TL: Sar-e-Sang luzurite deposit in Afghanistan.

Name Origin:
From its locality.
Physical Properties:

Cleavage:
[???] Perfect

Color:
blue or colorless.

Density:
2.55 - 2.65, Average = 2.59

Diaphaniety:
Transparent

Habits:
Massive - Uniformly indistinguishable crystals forming large masses., ,

Hardness:
5-6 - Between Apatite and Orthoclase

Luster:
Vitreous (Glassy)

Streak:
white
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Afghanite definition was found in categories: Science & Technology(1) Encyclopedia(1)

Afghanite Definition from Science & Technology Dictionaries & Glossaries

Minerals

Afghanite
(Na,Ca,K)8(Si,Al)12O24(SO4,Cl,CO3)3 (H2O)

Afghanite Definition from Encyclopedia Dictionaries & Glossaries

Wikipedia English - The Free Encyclopedia

Afghanite

Afghanite, (Na,Ca,K)₈(Si,Al)₁₂O₂₄(SO₄,Cl,CO₃)₃·H₂O, is a hydrous sodium, calcium, potassium, sulfate, chloride, carbonate alumno-silicate mineral. Afghanite is a feldspathoid of the cancrinite group and typically occurs with sodalite group minerals. It forms blue to colorless, typically massive crystals in the hexagonal crystal system. It has a Mohs hardness of 5.5 to 6 and a specific gravity of 2.55 to 2.65. It has refractive index values of nω=1.523 and nε=1.529. It has one direction of perfect cleavage and exhibits conchoidal fracture. It fluoresces a bright orange.

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