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A vein rock composed primarily of opal and chalcedony with some chromite, marcasite and locally magnesite. Found in ultrabasic rocks.

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Classification of BoetoniteHide

Mineralogy of BoetoniteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Silica > ChalcedonySiO2
Silica > OpalSiO2 · nH2O
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:

References for BoetoniteHide

Reference List:
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Fettes (et al.), Metamorphic Rocks - A Classification and Glossary of Terms (2007) Cambridge University Press

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