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Formula: (Mn,Fe)SiO3.H2O(?)
Phyllosilicate (sheet silicate)
Forms a series with hisingerite.
manganese-bearing mineral
Varieties
Chinglusuite is a variety of neotocite
Properties
Crystal System: Amorphous
Specific gravity: 2.43 measured
Hardness: 3 to 4
Streak: Brown
Colour: Black, dark brown to dark olive-green, dark red-brown
Solubility: Decomposed by hydrochloric acid (Dana)
Common impurities: Al,Mg,Ca,Na,K,C
Environments:
Pegmatites
Hydrothermal environments
Neotocite is a secondary mineral formed from the alteration of
rhodonite and other manganese silicates, associated with
rhodonite,
calcite and quartz. It is frequently found as veins
in weathered manganese-bearing pyroxenes,
especially rhodonite, and also
in spessartine. It is also found lining fractures in
granite pegmatites
(Dana).
At the Chinglusuai River Valley, Lovozersky District, Murmansk Oblast, Russia, neotocite variety chinglusuite has been found on
feldspar
(FM 41230).
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