Amamoorite

amamoorite

braunite

hausmannite

vesuvianite

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Formula: CaMn²⁺₂Mn³⁺(Si₂O₇)O(OH)
Sorosilicate (Si₂O₇ groups), lawsonite group, manganese-bearing mineral
Crystal System: Monoclinic
Specific gravity: 3.88 calculated
Hardness: 6
Streak: Brown
Colour: Black; in thin section intensely orange-red

Sedimentary environments

Amamoorite is a relatively new mineral, approved in 2018 and to date (January 2023) reported only from the type locality.

Localities

At the type locality, the Amamoor mine, Amamoor Creek, Gympie Region, Queensland, Australia, amamoorite is a new ilvaite-related mineral from the manganese deposits, discovered in drill core samples. The manganese ores occur in a series of metasedimentary rocks, mafic to intermediate lavas, volcaniclastic rocks and breccias.
Amamoorite occurs as anhedral black grains to 0.5 mm, orange-red in thin section, associated with major braunite and hausmannite, and some samples contained inclusions of manganese-bearing vesuvianite. Other minerals identified in the ore zone are quartz, calcite, baryte, garnet, lizardite, bustamite, magnetite and a manganese-bearing chlorite (AJM 20.2.7-14, 21.2.37).

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