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Fenaksite & Delhayelite

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CSL188894

Fenaksite & Delhayelite

Rare Mineral

Description Tabs

Description
Locality: 
Rasvumchorr Mountain, Khibiny Massif, Murmansk Oblast, Russian Federation
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3.1 × 2.7 × 2.1 cm
Description

This is a good combination of two rare silicate minerals. Fenaksite occurs as light pink-orange sharp cleavages in association with grey tabular delhayelite crystals and crystal sections. Some rounded free-standing delhayelite crystals also occur on the specimen.

Mineral Data
What's on the rock

Fenaksite

Formula: 
(K,Na)4(Fe,Mn)2(Si4O10)2(OH,F)
Strunz: 
9.DG.70
Hardness: 
5.0 - 5.5
Type Locality: 
Material'naya Adit, Yukspor Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia...

Delhayelite

Formula: 
(Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3·18H2O
Strunz: 
9.EB.10
Crystal System: 
Orthorhombic
Hardness: 
0.0
Type Locality: 
Mt Shaheru, Mt Nyiragongo, Goma, Kivu, Democratic Republic of Congo (Zaïre)
Loranth Minerals

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