Essexitic olivine basalt
 >View Microscope
Fact sheet
Description: 

Darwin wrote "From the Central Mountains. Common augitic? olivine lava (---- with large crystals of oliv)"

Porphyritic basalt containing large euhedral phenocrysts of olivine and pyroxene in a finely-crystalline groundmass of pyroxene, plagioclase feldspar and opaque iron oxides. Collected in Nov 1835.

In Place
In Time
Location description: 
Tahiti
Accuracy:
Location precision: 
Moderate
Timescale:
Not known
Ma = Millions of years ago
In Focus
Theme:

Theme:

What\
Type:
Type: 
igneous
What\
Category:

Category:

What\
Rock-forming minerals:

Rock forming mineral:

What\