Jaspillite

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

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

References

• Jaspillite and Taconite etymology
• Mindat.org data
• Rob Kanen, 2001, The Hamerseley Basin