Strontian hollandite in a quartz schist from the Saruta-gawa area in the Sanbagawa metamorphic terrain, central Shikoku, Japan

Strontian hollandite (up to 3.45 wt.% SrO) is found to occur in a piemontite-bearing quartz schist of the Sanbagawa metamorphic terrain in central Shikoku, Japan. Hollandite occurs as an aggregate of fine crystals (up to 100 μ m long) associated with braunite. From the central part of the aggregate...

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Bibliographic Details
Published in:Mineralogical Journal 1996, Vol.18(1), pp.23-30
Main Author: BANNO, Yasuyuki
Format: Article
Language:English
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Summary:Strontian hollandite (up to 3.45 wt.% SrO) is found to occur in a piemontite-bearing quartz schist of the Sanbagawa metamorphic terrain in central Shikoku, Japan. Hollandite occurs as an aggregate of fine crystals (up to 100 μ m long) associated with braunite. From the central part of the aggregate outward, its BaO, Fe2O3 and TiO2 contents increase and its MnO2, K2O and SrO contents decrease. Chemical variation in the hollandite suggests K (Mn4+, Ti4+)⇔(Ba, Sr)Fe3+ substitution. Hollandite is tetragonal or pseudotetragonal, and lattice constants are a=9.90(4) Å and c=2.87(5) Å.
ISSN:0544-2540
1881-4174
DOI:10.2465/minerj.18.23