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Milarite

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CR726444

Milarite

Rare Mineral

Description Tabs

Description
Locality: 
Valenciana Mine, Guanajuato, Guanajuato Municipality, Guanajuato, Mexico
Class: 
Crystals on Matrix
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.6 × 4.5 × 2.3 cm
Description

Dozens of excellent gemmy yellow-green hexagonal milarite crystals intergrown with white adularia.
The locals call this adularia Valencianite, as its lustre and sharp rhombohedral form with a bit of a curve make it distinct from normal adularias crystals.
The largest of the Milarites is 3 mm across and is classic for this famous locality from old finds of the 1960s
Ex Hoffmann collection.

Mineral Data
What's on the rock

Milarite

Formula: 
K2Ca4Al2Be4Si24O60·H2O
Strunz: 
9.CM.05
Hardness: 
6.0
Type Locality: 
Giuv Valley, Tujetsch (Tavetsch), Vorderrhein Valley, Grischun (Grisons; Graubünden), Switzerland