Taniajacoite

taniajacoite

sugilite

namansilite

norrishite

Images

Formula: SrCaMn3+2Si4O11(OH)4.2H2O
Sorosilicate, ruizite group, manganese-bearing mineral
Specific gravity:
Hardness: 5 to 5½
Streak: Light brown
Colour: Brown
Solubility: Insoluble in water or hydrochloric acid

Environments

Metamorphic environments
Hydrothermal environments

Taniaiajacoite is a fairly new mineral, approved in 2015.

Localities

At the type locality, the N'Chwaning III Mine, N'Chwaning Mines, Kuruman, Kalahari manganese field, Northern Cape, South Africa, both Taniaiajacoite and strontioruizite were found on chemically weathered manganese matrix probably resulting from hydrothermal activity. Taniaiajacoite occurs as brown radiating groups or aggregates of acicular or prismatic crystals, with individual crystals up to 0.15 x 0.04 x 0.02 mm. Associated minerals include acicular fibrous purple sugilite, aegirine, white pectolite, richterite, potassic-ferri-leakite, braunite-II, lipuite, hematite and microscopic namansilite and norrishite (CM 59.431-444, R&M 95.2.180-181)

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