Hillhead 2012
19 - 21 June 2012
International live demonstration show for the quarrying, recycling and heavy construction industries at Hillhead Quarry, Buxton, UK.
perlite
A variety of obsidian consisting of the oxides of silicon and aluminium combined as a natural glass. When crushed and heated, it expands to form a lightweight aggregate.
The monthly journal for the quarry products industry.