Abstract

Kraisslite is a new species from the Sterling Hill Mine, Ogdensburg, Sussex County, New Jersey. It closely resembles mcgovernite in physical appearance. The mineral occurs between the 700' and 950' levels in the central zincite zone, as films and lenses up to one inch thick along fractures. Twenty species were identified in the suite, of which sixteen are secondary minerals. Eveite, synadelphite, retzian, hodgkinsonite, holdenite, and austinite constitute new finds.

Kraisslite is hexagonal, a = 8.22(1) c = 43.88(5)A, space group P6322, and is probably structurally related to hematolite and mcgovernite. Specific gravity 3.876, hardness between 3 and 4, cleavage {0001} perfect and inelastic, color deep coppery-brown, streak golden-brown, luster submetallic, uniaxial (+), birefringence weak, ω = 1.805(2). The chemical composition is (Mn0.892+Mg0.08Fe0.032+)24Zn4(AsO4)4(SiO4)8(OH)12.

The new mineral honors Frederick and Alice Kraissl of Hackensack, New Jersey, devoted students of Franklin mineralogy.

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