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Londonite

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CR13312

Londonite

Rare Mineral

Description Tabs

Description
Locality: 
Antandrokomby, Madagascar
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.4 × 4.2 × 4.5 cm
Largest Crystal: 
1.80cm
Description

A very good 1,8 cm pale yellow green londonite crystal sits in a cleft on feldspar, quartz and rubellite matrix.

Mineral Data
What's on the rock

Londonite

Formula: 
(Cs,K,Rb)Al4Be4(B,Be)12O28
Strunz: 
6.GC.05
Crystal System: 
Isometric
Hardness: 
8.0
Streak: 
White
Type Locality: 
Antandrokomby pegmatite, Manandona Valley, Sahatany Pegmatite Field (Mt Ibity area), Vakinankaratra Region, Antananarivo Province, Madagascar