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Nybøite

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GFM613861

Nybøite

Rare Mineral

Description Tabs

Description
Locality: 
Palos Hill, Gria Spilia, Syros Island, Kykládes, South Aegean, Greece
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
1.5 × 4.5 × 2.5 cm
Largest Crystal: 
0.50cm
Description

dark blue semi-transparent gemmy crystals of 5 mm, very rich on a matrix of greenish-grey jadeite crystals and some muscovite. Nyboite is only developed under extremely high pressure in very deep subduction zones

Mineral Data
What's on the rock

Nybøite

Formula: 
NaNa2(Mg3Al2)(AlSi7O22)(OH)2
Strunz: 
9.DE.25
Hardness: 
5.0 - 6.0
Colour: 
Blue-grey
Type Locality: 
Nybø eclogite pod, Nordfjord, Sogn og Fjordane, Norway