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.

First Page Preview

First page PDF preview
You do not currently have access to this article.