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Formula: SrMn3+2(Si2O7)(OH)2.H2O
Sorosilicate (Si2O7 groups),
lawsonite group,
strontium- and
manganese- bearing mineral
Crystal System: Orthorhombic
Specific gravity: 3.68 calculated
Hardness: 4
Streak: Yellowish brown
Colour: Yellow-brown
Luminescence: Not fluorescent under UV
Common impurities: Fe,Ca,Ba
Environments
Metamorphic environments
Hydrothermal environments
Localities
At the type locality, the Wessels mine, Hotazel, Kalahari manganese field, Northern Cape, South Africa,
hennomartinite formed as a hydrothermal reaction product of
primary manganese ore,
where it occurs as yellow-brown poikiloblasts (a metamorphic texture in which small grains of one constituent lie within
larger grains) up to 1 mm in diameter
(AM 79.763-767).
It was found in a hand specimen, in veinlets of
serandite-pectolite cutting
sugilite, associated with
serandite-pectolite,
sugilite, braunite,
taikanite and
potassic-mangani-leakeite
(HOM).
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