General Information:
Chemical Formula:Th(Ca,Na)2(K1-x,[ ]x)Si8O20·n(H2O)
Environment:Found in the albitized exocontact zone at the Djelisu and Dara-Pioz alkaline complexes. The calcium dominant analog of steacyite.
IMA Status:Approved IMA 1996, (Dana # Added)
Locality:Located 40 km apart north and south, respectively, of the Turkestan - Tadjikistan border.
Name Origin:Named after the discovery locality, along the Turkestan Ridge.
Physical Properties: Cleavage:[111] Imperfect, [111] Imperfect, [111] Imperfect
Color:apple green, dark green, or brown.
Density:3.36
Diaphaniety:Transparent
Habits:Granular - Generally occurs as anhedral to subhedral crystals in matrix., Euhedral Crystals - Occurs as well-formed crystals showing good external form.,
Hardness:5.5-6 - Knife Blade-Orthoclase
Luminescence:Non-fluorescent.
Luster:Vitreous (Glassy)
Streak:white
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