Wednesday, 5 October 2011

Quartzite ~

Quartzite is formed underground by intense pressure and heat, from what was originally sandstone.  For this reason it is termed a metamorphic rock, as it has changed from one form to another.  

It is a long time favourite stone of mine, my affection for it possibly linked to the origin of the pieces I have: they are from the Rakaia, which is near to where I was born and grew up.  The ones shown here are all termed river pebbles and have been machine-tumbled to produce their satiny finish. 

On close inspection they can be seen to glisten slightly and always seem to me to be rather like crushed snow...  And the water that washed them into pebbles does come straight from the mountains - very cold and fresh, and very likely to have been snowy at some point!

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