List of Gemstones | Rare Minerals | Gem stones | Gems » sogdianite http://www.all-gemstones.com www.all-gemstones.com    Thu, 06 May 2010 12:29:47 +0000 http://wordpress.org/?v=2.8.6 en hourly 1 Sogdianite http://www.all-gemstones.com/sogdianite http://www.all-gemstones.com/sogdianite#comments Tue, 19 Jan 2010 05:51:19 +0000 admin http://www.all-gemstones.com/?p=1309 Refractive Index : 1608 – 1.606 Optical Characteristic : DR, U- Specific Gravity : 2.90 – 2.76 Formula : (K,Na)2Li,Fe,AI,Ti)2Zr2(Si2O5)6 Crystal System : Hexagonal Variety/Species : sogdianite Species/Group : Osumilite group Birefringence : 0.002 Dispersion : Hardness : 5 to 7 Toughness : poor Ultrasonic : Never Steam : Never UV Long : Inert to weak UV Short : Inert to weak Pleochroism : None Strength : N/A
Pleochroism Colors : None Heat : sensitive Acids : sensitive Light : stable Polish Luster : vitreous to waxy Fracture : conchoidal Fracture Luster : Clarity Type : N/A Tones : N/A Saturations : N/A Cause of Color : Enhancements : none Cleavage : perfect 1 direction. Color Range : violet, (bright) violetish Transparency : opaque Phenomena : None
Separations : Sogdianite from-
Sugilite : spectrum (possibly) Identifying Characteristics and information
Extremely rare.

Usually mixed with other minarals so RI and SG are variable.

May require chemical analysis to separate from sugilite. Spectral Data
Sharp lines at 4110, 4190 and 4370 (diagnostic). weak bands at 4880-4930 and 6300-6450. Trade Names and Misnomers
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