Sogdianite Value, Price, and Jewelry Information


Sogdianite is an extremely rare mineral, suitable for cabochons. The color is striking and the material is hard enough to take a good polish. It is usually mixed with other minerals, so the SG and hardness are variable. Chemical analysis may be required to differentiate sogdianite from sugilite, but the latter is far more abundant.

Sogdianite Value

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Sogdianite Information

DataValue
NameSogdianite
Crystallography Hexagonal; crystals not observed; massive, platy.
Colors Bright violet.
Luster Vitreous to waxy.
Hardness 7, if pure (South Africa: 5-6).
Specific Gravity 2.90, if pure (South Africa: 2.76).
Birefringence 0.002.
Cleavage Perfect 1 direction.
Luminescence Very weak dark red in SW, weak violet in LW.
Spectral Diagnostic, sharp lines at 4110, 4190, and 4370; weak bands at 4880-4930 and 6300-6450.
Formula(K,Na)2Li2(Li,Fe,Al,Ti)2Zr2(Si2O5)6.
Pleochroism Not reported.

Optics: 0 = 1.606; e = 1,608,

Uniaxial (-).

Occurrence: ln the Alai Range, Tadzhik,SSR, platy masses up to 10 X 7 X 4 cm, in a vein pegmatoidal body compositionally like an alkalic granite.

Also occurs at the Wessel Mine, Karuman, North Cape Province. South Africa.

Comments: Sogdianite is an extremely rare mineral, suitable for cabochons. The color is striking and the material is hard enough to take a good polish. It is usually mixed with other minerals, so the SG and hardness are variable. Chemical analysis may be required to differentiate sogdianite from sugilite, but the latter is far more abundant.

Name: From Sogdiana, the name of an ancient state in Middle Asia.