manganese mineral

Formula: Mn2+6Zn3(AsO4)2(SiO4)(OH)8
Compound arsenate
Specific gravity: 4.11
Hardness: 4
Streak: White
Colour: Pink to deep red

Hydrothermal environments

At the type locality, Franklin, New Jersey, USA, holdenite is a secondary 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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