Hornblende schist
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Fact sheet
Description: 

Darwin wrote: “Summit of Mount; more coarsely crystallized greenstone, tough, highly sonorous, little slaty in larger more compact masses.”

Originally described as a greenstone, this rock is a hornblende schist which in this particular thin section is lacking a clearly defined schistosity. Quartz is the only other major constituent.

In Place
In Time
Location description: 
Off the summit of Mount Montivideo, Uruguay.
Accuracy:
Location precision: 
Poor
Timescale:
Not known
Ma = Millions of years ago
In Focus
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Type:
Type: 
metamorphic
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