Nepheline basanite with iddingsite
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Fact sheet
Description: 

Darwin wrote "Compact, dark greenish basaltic-like rock, with numerous very minute grains of red olivine"

Alteration of this basaltic rock has converted original olivine microphenocrysts into reddish-orange iddingsite. Nepheline is an uncommon microphenocryst phase. A single large xenolith of feldspar-rich material and a calcite-filled vein are the other features of note. Collected in Nov 1836.

In Place
In Time
Location description: 
Stobart, Tasmania
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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