Tapiolite-(Mn)

tapiolite-(Mn)

tapiolite-(Fe)

cassiterite

microlite

Images

Formula: Mn²⁺Ta₂O₆
Multiple oxide, tapiolite group, tantalum-bearing mineral, forms a series with tapiolite-(Fe), tetragonal paramorph of orthorhombic tantalite-(Mn)
Crystal System: Tetragonal
Specific gravity: 7.72 calculated
Hardness: 6 to 6½
Streak: Dark brown
Colour: Dark brown
Environments

Pegmatites

Localities

At the type locality, the Tiainen pegmatite, Eräjärvi area, Orivesi, Pirkanmaa, Finland, tapiolite-(Mn) is a rare accessory mineral in a lithium-rich granite pegmatite dike. Associated minerals include tapiolite-(Fe), antimony, cassiterite, microlite, albite, schorl and apatite (AM 70.217, HOM).

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