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Formula: Mn2+6Zn3(AsO4)2(SiO4)(OH)8
Compound arsenate,
manganese-bearing mineral
Crystal System: 4.11 measured, 4.27 calculated
Specific gravity: 4.11
Hardness: 4
Streak: White
Colour: Pink to deep red
Environments:
At the type locality, Franklin, New Jersey, USA, holdenite is a
secondary arsenic
mineral in veinlets, on slip surfaces and as
interstitial̄ fillings within a metamorphosed stratiform zinc deposit associated with
franklinite, willemite,
pyrochroite, baryte,
kolicite, sussexite,
kraisslite,
zincite, sphalerite,
galena, calcite
and rhodochrosite.
(HOM, AM12.148)
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