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Pb3As4S9
Triclinic, P1, a = 22.86, b = 8.39, c = 7.94 Ć,
a = 90, b = 97, g
= 90o, Z = 4
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| Figure 21-37. Prismatic crystals of baumhauerite from Sterling Hill, growing randomly on platy molybdenite. Field of view is 0.3 mm in maximum dimension. See figure 21-11. | ||
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Baumhauerite is a rare mineral from Sterling Hill and is unknown from Franklin.
Baumhauerite occurs as prismatic, acicular, black crystals approximately l mm in length (Figure 21-37). Physical and optical properties were not determined due to the small crystal size and twinning on (100) by reflection. The crystals have a supercell with c = 23.8 Ć (Dr. Joel Grice, pers. comm.).
Baumhauerite is a lead arsenic sulfide mineral. Sterling Hill material is antimonian with a composition of Pb 50.3, Sb 10.5, As 16.2, S 23.1, total = 100.1 wt. %.
Baumhauerite was found on the 900 level at Sterling Hill by John Kolic. Dissolution of the calcite matrix revealed a number of associated minerals including molybdenite-2H (Figure 21-11), tennantite, arsenopyrite, and seligmannite. Associated gangue minerals are realgar, diopside, barite, fluorapatite and tourmaline. Baumhauerite is commonly associated with molybdenite.
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| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
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Link
to homepage
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This
page created: January 11, 2001 |
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