Tourmaline Granite - Melbur (#11)
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Fact sheet
Description: 

This sample of tourmaline granite has been extemsively altered by hyrothermal processes. The feldspar has been kaolinised and considerable fluorite is now present. It is because of this later alteration that this part of the St Austell complex is an active china clay pit. Look at the hand specimen photographs to see orthoclase being altered to kaolinite. See if you can identify this alteration in the thin section.

In Place
In Time
Accuracy:
Location precision: 
Moderate
Timescale:
Timescale: 
Permian
Ma = Millions of years ago
In Focus
Collection:
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Type:
Type: 
igneous
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Rock-forming minerals:

Rock forming mineral:

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Accessory minerals:

Accessory minerals:

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