Jaspillite

Jaspilite sample from Minas Gerais, Brazil

Jaspillite, or jaspilite, is a chemical rock formed similar to chert, but is generally quite iron rich. It is also known as jasper taconite. Jaspillite is typically a banded mixture of hematite and quartz common in the banded iron formation rocks of Proterozoic and Archaean age in the Canadian shield.

Jaspillite is also formed as exhalative chemical sediments in certain lead-zinc ore deposits, and as a hydrothermal alteration facies around submarine volcanism.

References

This article is issued from Wikipedia - version of the Saturday, October 31, 2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.