Mcgovernite

McGovernite, Willemite, Franklinite, Calcite Locality: Sterling Mine, Ogdensburg, Sterling Hill, Sussex County, New Jersey (Type Locality for McGovernite and Franklinite) Overall Size:    25x21x16 mm Crystals: 1-3 mm © JohnBetts-FineMinerals

Chemical Formula: Mn19Zn3(AsO4)3(AsO3)(SiO4)3(OH)21
Locality: Sterling Hill, Franklin, Sussex Co., New Jersey, USA.
Name Origin: Named for J. J. McGovern (1915-), Franklin miner and mineral collector.

History

Discovery date : 1927
Town of Origin : MINE STERLING HILL, OGDENSBURG, SUSSEX CO., NEW JERSEY
Country of Origin : USA

Optical properties

Optical and misc. Properties : Translucent
Refractive Index : from 1,75 to 1,76

Physical Properties

Cleavage: {001} Perfect
Color:     Bronze brown, Light brown, Dark reddish brown, Reddish brown.
Density: 3.72
Diaphaneity: Translucent
Fracture: Brittle – Generally displayed by glasses and most non-metallic minerals.
Luminescence: Non-fluorescent.
Luster: Vitreous – Pearly
Streak: brown

Photos :

McGovernite, Willemite, Franklinite, Calcite Locality: Sterling Mine, Ogdensburg, Sterling Hill, Sussex County, New Jersey (Type Locality for McGovernite and Franklinite) Overall Size:    25x21x16 mm Crystals: 1-3 mm © JohnBetts-FineMinerals
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