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Gemstone Crystal System Density Hardness Refractive index Treatments
Afghanite hexagonal 2.55 to 2.65 5.5-6.0 1.522 to 1.533 none known

 

 

afghanite
Faceted Afghanite weighing 0.18 carat
Sar-e-Sang, Afghanistan

Colors:
Colorless to Blue.
Clarity: Type II
Optic Character :
Doubly Refractive, Hexagonal
Cause of Color: Chromium & Vanadium
Fracture : Concoidal

Luster : Vitreous to Greasy
Fluorescence:
Blue/Purple: SWUV; Orange/Pink: LWUV
Cleavage :
Perfect, One direction
Durability:Poor!

Characteristics for Identification:
Fingerprint Inclusions, Silk (rutile), Color Change

Localities:
At Sar-e-Sang, Badakhshan Province, Afghanistan. In Russia, in the Malaya
Bystraya and Tultuy lazurite deposits, near Lake Baikal, and in other unspeci¯ed deposits in
eastern Siberia. From Lyadzhuar-Darinsk, Pamir Mountains, Tajikistan. In Italy, at the Pitigliano
quarry, near Grosseto, Tuscany; on Monte Somma, Campania; from Vetralla and Bassano, Latium.
In the Edwards mine, Edwards, St. Lawrence Co., New York, USA. At Lake Harbour, Ba±n
Island, Newfoundland, Canada.

Afghanite
(Na, Ca, K)8[Al6Si6O24(SO4Cl2CO3)0.5 H20

Afghanite is a sodim aluminum feldspathoid first found in the vicinity of Sar-e-Sang, Afghanistan in 1968. Afghanite is associated with the lapis lazuli deposits found in this area of Afghanistan.

Afghanite can be confused with:
Hauyne

Following are examples of afghanite crystals:

afghanite crystals

afghanite crystals