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Phlogopites and potassic richterites from mica nodules in South African kimberlites

✍ Scribed by Ken-ichiro Aoki

Publisher: Springer
Year: 1974
Tongue: English
Weight: 477 KB
Volume: 48
Category: Article
ISSN: 0010-7999
DOI: 10.1007/bf00399105

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✦ Synopsis

Mica nodules from the Dutoitspan and Wesselton mines, Kimberley can be divided into two groups: diopside-phlogopite nodules and potassie riehterite-phlogopite nodules. The latter is characterized by the presence of abundant potassic richterite (less than 50% by volume) and large size of the crystals (up to 1 cm in length). It seems this type nodule is the first finding.

Phlogopites and potassie riehterites show a rather wide variations of major elements they have low A1203 and high FelOn, with Fe+a in addition to A1 +a in the tetrahedral sites. It is believed that the mica nodules would be produced from kimberlitic and related magmas under moderate temperature and pressure conditions.

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