OU-1 Bardon volcanic tuff
Purchase Code: QC-2
IAG members: £ 65
Non-Members: £ 100
OU-1 data sheet
The rock is a fine-grained grey-green volcanic tuff partially recrystallized during low grade metamorphism. Its mineral composition is largely plagioclase, feldspar with epidote, chlorite and some quartz. It was deposited at a volcanic centre active around 600 million years ago, within the Charnian of Leicestershire, England.
The particle size distribution has been determined as 86.9% <63 μm, 12.8% between 63 and 125 μm, and 0.3% >125 μm.
The material is available in units of 35 g packaged in a polyethylene sachet.