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Mineralpedia Details for Segnitite

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Segnitite

Segnitite

Named to honor Australian mineralogist and petrologist Dr. E. Ralph Segnit of the University of Adelaide in Adelaide, Australia for his work on Australian mineralogy. Segnitite occurs in a few localities, most notably at Broken Hill in New South Wales, Australia as a rare mineral in the oxidized portions of the lead-zinc orebody and at Tsumeb in Namibia as a mineral found in the dolostone hydrothermal metallic ore deposit.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/segnitite.pdf

Formula
PbFe3+3(AsO4)(AsO3OH)(OH)6 
Crystal System
Trigonal 
Cleavage
Good, None, None 
Luster
Adamantine 
Color
greenish brown, yellow brown 
Streak
light yellow 
Class
Trigonal - Hexagonal Scalenohedral 
Hardness
WebMineral
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Mindat
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Segnitite (zincian) from San Rafael mine, Nye Co., Nevada, United States

Segnitite (zincian)
            from San Rafael mine, Nye Co., Nevada, United States

Mustard yellow bead-like crystals to about 0.5mm associated with green cuprian Adamite and Segnitite coated, prismatic Mimetite crystals. Also included on this piece is light yellow, hexagonal crystals of Mimetite.

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Segnitite from Kintore Opencut, Broken Hill, New South Wales, Australia

Segnitite
            from Kintore Opencut, Broken Hill, New South Wales, Australia

Yellowish green diamond shaped crystals to about 0.5mm on red Carminite or Mawbyite.

Click thumbnail images for larger view.

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