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Astrophyllite

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RSL687352

Astrophyllite

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Description
Locality: 
Água de Pau Volcano, São Miguel Island, Azores District, Portugal
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3 × 2 × 1.8 cm
Largest Crystal: 
0.50cm
Description

Elongated astrophyllite crystals, with a toasted honey colour, brilliant and disposed on the sienite matrix. Good size for the locality. Sienite xenolith, up to 50 cm in diameter, can show different textures, fine to thick grain. Inside the cavities these rare minerals have been formed.

Mineral Data
What's on the rock

Astrophyllite

Formula: 
(K,Na)3(Fe,Mn)7Ti2Si8O24(O,OH)7
Strunz: 
9.DC.05
Crystal System: 
Triclinic
Hardness: 
3.0
Streak: 
Golden
Type Locality: 
Låven (Skådön; Lamö; Lamanskjaer), Langesundsfjorden, Larvik, Vestfold, Norway