Li-mica Topaz Granite - Gunheath (#20)
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Fact sheet
Description: 

This is an extremely evolved granite. Its mica is lithium-enriched and there is considerable fluorine present in the form of topaz and fluorite. The fluorite is colourless in thin section so look very carefully to find it. It has a slightly higher relief than quartz and is isotropic. Considering that this sample was collected in a china clay pit, its feldspar is relatively free of alteration.

In Place
In Time
Location description: 
Gunheath china clay pit, near Stenalees, St Austell, Cornwall
Accuracy:
Location precision: 
Moderate
Timescale:
Not known
Ma = Millions of years ago
In Focus
Collection:
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Type:
Type: 
igneous
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Accessory minerals:

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