bastite

bastite

[′ba‚stīt]
(mineralogy)
A hydrated magnesium silicate, a variety of serpentine occurring from the alteration of orthorhombic pyroxenes such as enstatite.
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Serpentinisation of tectonized Harzburgites rocks in Ophiolits of Ashin has occurred in two different phases; in the first phase this phenomenon has taken place in a static and calm condition without any mechanical deformation of the hosting Harzburgite rocks; meanwhile the ferromagnesian minerals such as olivine and pyroxene have transformed into pseudomorphous Lhizardite and Bastite minerals [17].
All the orthopyroxene crystals are replaced by bastite, and plagioclase is moderately saussuritized because of hydrothermal alteration.
The olivine is partially to completely replaced by antigorite and iddingsite and the orthopyroxene is generally replaced by antigorite, bastite and chlorite.
Some of the larger orthopyroxene grains show extensive alteration and are almost totally transformed into bastite. They also show alteration to a mixture of hornblende, chlorite and quartz such that a symplectitic intergrowth is produced.