Item talk:Q162712
From geokb
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
