Harrisite
A rock subtype
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About Harrisite
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 quickly 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.
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.
Unique Identifiers
Mindat ID:
40726
Long-form identifier:
mindat:1:1:40726:3
Similar Names
| Farrisite | A rock subtype | |
| Harrisite (of Dana) | A variety of Chalcocite | Cu2S |
Classification of Harrisite
Gabbro is in section 10 of the QAPF diagram.
Mineralogy of Harrisite
Essential minerals - these are minerals that are required within the classification of this rock:
| Feldspar > Plagioclase > Anorthite | Ca(Al2Si2O8) |
| Olivine | Commonly used as a synonym for a member of the Fayalite-Forsterite Series, but more generally and properly ... |
| Pyroxene | A petrological term for Pyroxene Group. |
Other Language Names for Harrisite
Simplified Chinese:方铜矿
Internet Links for Harrisite
mindat.org URL:
https://www.mindat.org/min-40726.html
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Please feel free to link to this page.
Baracca quarry, Mattarana, Carrodano, La Spezia Province, Liguria, Italy