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Harrisite

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A variety of troctolite in which the large black lustrous olivines have a branching habit of growth and are orientated perpendicular to the layering. These crystals, unlike most large crystals in igneous rocks, grew qucikly after a slowly-cooling magma became supersaturated (over-enriched) in olivine components or was trapped beneath another rock layer.

The matrix to the olivines is composed of highly calcic plagioclase and minor pyroxene.

Note that the name Harrisite (after Dana) has also been used for pseudomorphs of chalcocite or djurleite after galena.


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Classification of HarrisiteHide

Gabbro is in section 10 of the QAPF diagram.


Mineralogy of HarrisiteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Plagioclase > AnorthiteCa(Al2Si2O8)
OlivineEquivalent to Fayalite-Forsterite Series; usually a more or less Fe-bearing forsterite.
PyroxeneA petrological term for Pyroxene Group.

Other Language Names for HarrisiteHide

Simplified Chinese:方铜矿

References for HarrisiteHide

Reference List:
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Le Maitre (ed.) (2002) Igneous Rocks - A Classification and Glossary of Terms. Cambridge Press

Internet Links for HarrisiteHide

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