Diorite - Magellan Straits
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Fact sheet
Description: 

Darwin wrote "Greenstone with mica (& quartz veins) forming mass of hill, cutting through & overlying slate (fine crystals of hornblende; many scales of mica; crystals of albite but two macles; numerous specks of pyrites; heavy compact rock, coarsely crystallized"

Euhedral crystals of green amphibole dominate this well crystallized diorite. Large, zoned crystals of plagioclase feldspar  interstitial quartz and accessory amounts of opaque iron oxides (ilmenite?) complete the assemblage. Collected Apr-Jun 1834.

In Place
In Time
Location description: 
Magellan Straits, Chile
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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