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Londonite & Tourmaline

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CAM190304

Londonite & Tourmaline

Description Tabs

Description
Locality: 
Ambalabe, Manapa, Anosiarivo Manapa, Betafo, Vakinankaratra, Madagascar
Size Range: 
Small cabinet (7-10 cm)
Size: 
7.6 × 4.6 × 2.7 cm
Largest Crystal: 
1.00cm
Description

White, glassy, well-formed londonite crystals up to 8 mm on matrix. Associated with greenish-brown tourmaline crystals (probably liddicoatite) up to 1 cm.
A very good display specimen.

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

Tourmaline

Formula: 
A(D3)G6(T6O18)(BO3)3X3Z
Crystal System: 
Trigonal
Hardness: 
7
Cartils Minerals

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