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Mineralpedia Details for Astrophyllite

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Astrophyllite

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 
WebMineral
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Mindat
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Astrophyllite from Låven, Langesundsfjorden, Larvik, Vestfold, Norway

Astrophyllite
            from Låven, Langesundsfjorden, Larvik, Vestfold, Norway

Deep reddish brown long bladed crystals to 3.5cm.

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Astrophyllite from Eveslogchorr Mt, Khibiny Massif, Kola Peninsula, Russia

Astrophyllite
            from 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.

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Astrophyllite from Khibiny Massif, Kola Peninsula, Russia

Astrophyllite
            from 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. 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).

This is a smaller specimen but with beautiful elongated bronze crystals to 1cm.

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Astrophyllite from Skutesundskjær, Barkevik, Langesundsfjorden, Larvik, Vestfold, Norway

Astrophyllite
            from Skutesundskjær, Barkevik, Langesundsfjorden, Larvik, Vestfold, Norway

Long excellent blades to 4cm of golden brown Astrophyllite. This is an old University of Chicago piece from Paul Moore. See prov. tab.

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Astrophyllite from Hillside Park Claims, St. Peters Dome dist., El Paso Co., Colorado, United States

Astrophyllite
            from Hillside Park Claims, St. Peters Dome dist., El Paso Co., Colorado, United States

Long bladed golden crystals to over 2cm.

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Astrophyllite from Mont Saint-Hilaire, Rouville Co., Quebec, Canada

Astrophyllite
            from Mont Saint-Hilaire, Rouville Co., Quebec, Canada

Astrophyllite is an inosilicate with a {010} perfect cleavage. This specimen shows beautiful groups of radial bronze, bladed crystals 6mm resembling a mica in Albite matrix. However, it is not phyllosilicate and thus not a mica either. It typically occurs in pegmatites, nepheline syenites and alkaline granites such as Mont Saint-Hilaire, 

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Astrophyllite from Langesundsfjorden, Larvik, Vestfold, Norway

Astrophyllite
            from Langesundsfjorden, Larvik, Vestfold, Norway

At first glance this looks like a biotite mica. It is actually not even micaceous even though it looks micaceous. The crystals are brown, shiny, and platy, which only looks like mica but is placed in this Special Edition to show the similarity of the two minerals.

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