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Astrophyllite with Aenigmatite

#PD34669R

Astrophyllite with Aenigmatite

#PD34669R
Availability
Sold
Size
9 x 5 x 2 cm - Sm Cabinet 
Formula
K2NaFe2+7Ti2(Si4O12)2O2(OH)4F (RRUFF)
Locality
Eveslogchorr Mt, Khibiny Massif, Kola Peninsula, Russia

Astrophyllite is NOT a mica but is an inosilicate, which can resemble mica plates in hand specimen, as is the case and with most of the Astrophyllite. Astrophyllite has a perfect cleavage, can be split like a mica in thin sheets, but is very brittle (Ency. of Minerals). The color is much like a mica also being a bronze to orange yellow. Usually found in pegmatites of nepheline syenites, alkaline granites of MSH and Magnet Cove (typical for titanium minerals). Finest crystals come from Khibiny massif (Bernard & Jaroslav).

A nice specimen with long bronze plates of Astrophyllite to 2.5cm and a large crystal of Aenigmatite to 4.5cm.

Astrophyllite

Formula
K2NaFe2+7Ti2(Si4O12)2O2(OH)4
Crystal System
Triclinic 
Crystal Habit
Bladed, Stellate, Crystalline - Fine 
Cleavage
Perfect, None, None 
Luster
Adamantine - Pearly 
Color
brown, brownish red, bronze yellow, gold yellow 
Streak
yellowish brown 
Class
Triclinic - Pedial 
Fracture
Brittle 
Hardness
3-3.5 

Data courtesy of Webmineral.

Collection
Phillips Collection

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