Quartz-Tourmaline Vein - Treviscoe (#36)
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Fact sheet
Description: 

This sample represents the latest, highest and coolest level of activity of the hydrothermal system at St Austell. The blue, often needle-like, tourmaline was precipitated from highly saline fluids at between 250oC and 400oC, and was followed by hematite resulted from fluids of low salinity, with temperatures in the range 160oC to 200oC. The hematite forms felted masses and wormy growths within the veins.

In Place
In Time
Location description: 
Treviscoe china clay pit, near St Dennis, Cornwall
Accuracy:
Location precision: 
Moderate
Timescale:
Timescale: 
Permian
Ma = Millions of years ago
In Focus
Collection:
What\
Type:
Type: 
igneous
What\
Rock-forming minerals:

Rock forming mineral:

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