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Formula: Sr2Mn3+(AsO4)2(OH)
Arsenate, brackebuschite
supergroup, strontium- and
manganese- bearing mineral
Crystal System: Monoclinic
Specific gravity: 4.679 calculated
Hardness: 4½ to 5
Streak: Yellow–orange
Colour: Orange-brown
Environments
Aldomarinoite is a new mineral, approved in 2021 and to date (June 2023) the type locality is the only
valid locality where the mineral has been reported.
Localities
At the type locality, the Valletta mine, Vallone della Valletta, Canosio, Cuneo Province, Piedmont, Italy,
aldomarinoite was found on the mine dumps in
iron-manganese ore in
metaquartzites. It occurs as orange brown, subhedral crystals less
than 0.5 mm in size in thin masses. Well-formed crystals, typically platy tablets, are very rare.
The aldomarinoite, together with lombardoite is associated with
quartz, aegirine,
baryte, calcite,
hematite, muscovite and
manganese minerals such as
cryptomelane, braunite and
manganberzeliite
(MM 86.447–458).
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