Zinnwaldite rich greisen
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Fact sheet
Description: 

This zinnwaldite-rich greisen comes from Gairnshiel at the centre of the Glen Gairn granite complex - a composite series of intrusions that were emplaced into Dalradian metasediments around 400 million years ago. The complex is located between the Cairngorm mountains (another granite complex) and the town of Ballater, in the Grampian Region of Scotland. The sample comes from close to the roof of a lithium-enriched pluton where magmatic fluids had ponded prior to consolidation crystallising the Li-rich mica zinnwaldite.

The thin section is dominated by quartz, plagioclase and the Li-rich mica zinnwaldite, and some muscovite. Zinnwaldite has lattice structure with similarlities to both muscovite and biotite. This thin section is also shown in reflected light since there are several ore minerals present as accessory minerals incuding molybdenite and pyrite.

In Place
In Time
infoImage: 
Location description: 
Gairnshiel, nweear Ballater, Aberdeenshire, Scotland
Accuracy:
Location precision: 
Moderate
Timescale:
Timescale: 
Devonian
Ma = Millions of years ago
In Focus
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Type: 
igneous
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