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Epistolite

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HEF1166347

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Description
Locality: 
Karnasurt Mountain, Lovozero Massif, Murmansk Oblast, Russian Federation
Class: 
Massive/Crystalline
Size Range: 
Thumbnail (1-3cm)
Size: 
2.2 × 1.1 × 0.7 cm
Description

Epistolite is a phyllosilicate mineral containing niobium, titanium, and sodium, belonging to the murmanite-lomonosovite group. Its composition is complex and can vary; one possible formula is (Na◻)Nb₂Na₃Ti(Si₂O₇)₂O₂(OH)₂(H₂O)₄. The mineral forms flat, tabular to mica-like, rectangular crystals or lamellar masses of a silvery-gray color.
 

Mineral Data
What's on the rock

Epistolite

Formula: 
Na2(Nb,Ti)2(Si2O7)O2·nH2O
Strunz: 
9.BE.30
Hardness: 
2.5 - 3.0
Type Locality: 
Nunarssuatsiaq, Tunulliarfik Fjord (Tunugdliarfik), Ilímaussaq complex, Narsaq, Kujalleq, Greenland

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Start 12 Feb 18:00
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Germany : Insured parcel < 2000g 6 €
6
Germany : Insured parcel > 2000g 9 €
9
International <500g 10 €
10
International > 500g < 1000g 18€
18
USA 12€
12
Worldwide < 5000g insured parcel 50€
50

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