Abstract

Paragenesis is determined from textural features involves the following minerals--braunite, hollandite, bixbyite, vredenburgite, jacobsite, hausmannite, manganite, pyrolusite, cryptomelane, and hematite. Identifications were confirmed by x-ray. The stability and transformation of these minerals may be correlated with laboratory phase equilibrium studies, although experimentally determined temperatures seem high, perhaps because carried out in air.

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