I02. Granite - Costello quarry - Galway
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Fact sheet
Description: 

Collected 10 cm from a fluorite vein and consequently greisenized. Compare with CMG3051, much more sericite and kaolinite; development of coarser secondary white mica, partly by alteration of chloritised biotite, secondary quartz; veinlets of sericite.

In Place
In Time
Location description: 
Costelloe quarry, Co. Galway, Ireland
Accuracy:
Timescale:
Not known
Ma = Millions of years ago
In Focus
Type:
Type: 
igneous
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Rock-forming minerals:

Rock forming mineral:

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