Hornblende porphyrite - Blue Mountains
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Fact sheet
Description: 

Darwn wrote "Dark green feldspathic greenstone, with many large crystals of hornblende"

Coarse to fine-grained crystals of green - straw brown hornblende dominate both the phenocryst and goundmass of this rock. Plagioclase feldspar is the only other major constituent. Collected in Feb 1836.

In Place
In Time
Location description: 
Blue Mountains, NSW, Australia
Accuracy:
Location precision: 
Poor
Timescale:
Not known
Ma = Millions of years ago
In Focus
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Type:
Type: 
igneous
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