Li-mica Topaz Granite - Trethosa (#14)
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Fact sheet
Description: 

This sample is from the most evolved part of the St Austell granite complex. It is enriched in both lithium (Li-mica) and fluorine (topaz). Considering that this sample was collected in a working china clay pit the feldspars are remarkably unaltered.

Rotation 3 shows an opaque mineral, thought to be a Nb-Ta oxide (probably manganotantalite).

In Place
In Time
Location description: 
Trethosa (Goonvean) china clay pit, near Nanpean, 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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Rock-forming minerals:

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Accessory minerals:

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