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Formula: KNa2(Mg2Fe3+2Li)Si8O22(OH)2
Double chain inosilicate (chain silicate),
leakeite root name group,
sodium amphibole subgroup,
w(OH, F, Cl)-dominant amphibole group,
amphibole supergroup
Crystal System: Monoclinic
Specific gravity: 3.18 calculated for the empirical formula
Hardness: 5
Streak: Pale brownish yellow
Colour: Reddish brown
Environments
Pegmatites
Hydrothermal environments
Localities
At the type locality, the Tanohata mine, Tanohata, Shimohei District, Iwate Prefecture, Japan,
potassic-ferri-leakeite forms prismatic crystals up to 2 mm in length and 0.2 mm in width, with a rhombic
cross-section. It occurs in pegmatite-like veinlets that cut
a manganese ore body. Associated minerals include
quartz, K-feldspar,
vanadium-dominant
manganoneptunite,
suzukiite, roscoelite and
serandite
(AM 88.1177).
Potassic-ferri-leakeite from the Tanohata
Mine - Image
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