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Orthopyroxene group

 

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Orthopyroxene Group  (Click PPL image to show labels)

Olivine

 

Orthopyroxene in a charnokite from Norway. Historically known as hypersthene, a name used for intermediate compositions between enstatite and ferrosilite. Pink/green pleochroism and lower birefringence than most common clinopyroxenes are useful distinguishing characteristics.

 

Width of central crystal: 4mm.

 

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Olivine XPL view

 

Orthopyroxene in a charnokite from Norway. Exsolution of clinopyroxene can be seen as bars of different colour.

 

Width of central crystal: 4mm.

 

 

   

 

   

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Olivine rollover

 

Orthopyroxene in a andesite lava from Hakone volcano Japan. Pink/green pleochroism visible, moderate birefringence. Glomerophyric texture.

 

Width of field of view: 8mm.

 

 

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Orthopyroxene in a andesite lava from Hakone volcano Japan. Pink/green pleochroism visible, moderate birefringence. Glomerophyric texture.

 

Width of field of view: 8mm.

 

 

 

   

 

   

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Olivine rollover

 

Orthopyroxene in a microgabbro from Centre 2, Ardnamurchan. This from a layered magma chamber, and shows alignment of both the pyroxene and the feldspar. Historically this mineral has been called hypersthene. Pink/green pleochroism

 

Width of field of view: 8mm.

 

 

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Orthopyroxene in a microgabbro, Ardnamurchan, Scotland. Moderate birefringence.

 

Width of field of view: 8mm.

 

 

 

   

 

   

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Streap rollover

 

Orthopyroxene in a lherzolite (mantle xenoliths) from Lochaber, Scotland. Pyroxene is slightly darker in colour but also has near parallel cleavage lines, which olivine does not have.

 

Width of field of view 8mm

 

 

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Orthopyroxene in a lherzolite (mantle xenoliths) from Lochaber, Scotland. Pyroxene has lower birefringence in comparison to the olivine.

 

Width of field of view 8mm

 

 

 

   

 

   

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