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Milarite

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PDM865876

Milarite

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Description
Locality: 
Jaguaraçu Pegmatite, Jaguaraçu, Minas Gerais, Brazil
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
1.4 × 0.8 × 0.5 cm
Description

Prismatic crystal of milarite on a small matrix of mica. It is formed by the first and second order hexagonal prisms {100} & {110}, with a good development of {001}. The lustre is good, has a nice colour zonation with the core of apple green colour. No damages, just the contact with the matrix at the base and one side.

Ex Francis Hubert #13706.

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

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