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Siderite With Albite

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LGM692228

Siderite With Albite

Ex Dr. Krantz, Bonn, Germany
With Antique Label

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Description Tabs

Description
Locality: 
Tugtup Agtakôrfia, Tunulliarfik Fjord, Ilímaussaq, Narsaq, Kujalleq, Greenland
Class: 
Crystals on Matrix
Size Range: 
Small miniature (3-4.5 cm)
Size: 
3 × 3.5 × 1.5 cm
Largest Crystal: 
1.50cm
Weight: 
21.00gr
Description

A greenland specimen labeled as "Albit mit Eisenspat" (Albite with siderite) - but marked with a question mark. In my opinion the black crystals are definitly no siderite (the striation of the crystals argues against siderite and also it is not described for Tugtup Agtakôrfia). Most likely is arfvedsonite, maybe worth an analysis.

An interesting specimen from old Dr. Krantz stock, comes with pencil writing on the backside of a printed A. Krantz label - such "recycling" labels were occasionally used by Krantz.

Mineral Data
What's on the rock

Siderite

Formula: 
FeCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.5 - 4.5
Streak: 
White

Albite

Formula: 
NaAlSi3O8
Strunz: 
9.FA.35
Crystal System: 
Triclinic
Hardness: 
6.0 - 6.5
Streak: 
White
Type Locality: 
Finnbo (Finbo), Falun, Dalarna, Sweden

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