Amygdaloidal monchiquite
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Fact sheet
Description: 

Darwin wrote: “Basaltic amygdaloidal with crystals of augite, forming dykes near landing place.”

This amygdaloidal monchiquite dyke rock contains euhedral phenocrysts of hornblende and pyroxene. The microcrystalline groundmass is dominated by small needles of hornblende. Amygdales are infilled with zeolite species, including chabazite.

In Place
In Time
Location description: 
Fernando de Noronha
Accuracy:
Location precision: 
Moderate
Timescale:
Not known
Ma = Millions of years ago
In Focus
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Type:
Type: 
igneous
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