AEGIRINE (ACMITE), MOUNT MALOSA, ZOMBA, MALAWI
AEGIRINE (ACMITE), MOUNT MALOSA, ZOMBA, MALAWI
Aegirine (until 1988 named ACMITE) belongs to the clinopyroxene group of inosilicate minerals and serves as the sodium endmember of the aegirine–augite series. Its chemical composition is represented by the formula NaFeSi2O6, where iron exists as the Fe3+ ion. Within the aegirine–augite series, sodium can be partially substituted by calcium, while iron(II) and magnesium can replace iron(III) to maintain charge balance. Additionally, aluminum can substitute for iron(III). A notable variety of this mineral is acmite, which is characterized by its fibrous green appearance.
Aegirine typically forms dark green monoclinic prismatic crystals, exhibiting a glassy luster and perfect cleavage. Its hardness on the Mohs scale ranges from 5 to 6, and it has a specific gravity that falls between 3.2 and 3.4.
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