Item talk:Q162712

Mindat Short Description

A relatively common Mn oxide that occurs in a variety of aggregate forms. Usually fibrous, either compact or isolated. Micaceous aggregates may be confused with ranciéite, fibrous forms with pyrolusite. Compare woodruffite.

As birnessite, it may be ...

Geoscience Ontology Status Notes

Yoshimura T (1934) "Todorokite", a new manganese mineral from the Todoroki mine, Hokkaido, Japan, Journal of the Faculty of Science, Hokkaido Imperial University, Series IV, Geology and Mineralogy 2, 289-297

IMA Formula (from Mindat)

(Na,Ca,K,Ba,Sr)_1-x(Mn,Mg,Al)₆O₁₂ · 3-4H₂O

RRUFF Formula (from Geoscience Ontology)

(Na,Ca,K,Ba,Sr)_1-x(Mn⁴⁺,Mn³⁺,Mg,Al)₆O₁₂·3-4H₂O

Additional References

• http://www.handbookofmineralogy.com/pdfs/todorokite.pdf

• http://www.webmineral.com/data/Todorokite.shtml