Andesite - James Island
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Fact sheet
Description: 

Darwin wrote "Trachytic cellular lava with few glassy feldspar crystals, not much fractured: olivine"

Flow banded andesite with a trachyitic and fragmental texture suggesting mixing of eruption products. Plagioclase feldspar (oligoclase) is the main microphenocryst species. Collected Sept-Oct 1835.

In Place
In Time
Location description: 
James Island (Santiago), Galapagos
Accuracy:
Timescale:
Not known
Ma = Millions of years ago
In Focus
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Type:
Type: 
igneous
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