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AsS
Monoclinic
Realgar, an arsenic sulfide mineral, was first reported from Sterling Hill by Palache (1941b); it is associated with arsenopyrite, pyrite, arsenic, and other species. No additional work has been published, and it has not been reported from Franklin.
Realgar occurs in deformed and irregular crystals. It is bright red to dark red; powders, films, and finely-disseminated grains may be orange. The luster is resinous to vitreous. Cleavages are present, but only the well-defined {010} cleavage is commonly evident. There are no analytical data for local material.
Realgar was noted by Palache (1941b) from the 900 level at Sterling Hill, associated with graphite, pyrite, and arsenopyrite in calcite. Nearly the same assemblage was found abundantly in the late 1970’s by John Kolic on the 900 and 1100 levels. The writer’s dissolution of a small part of the calcite matrix found the same species found earlier and clinopyroxene, quartz, and microcline. The 900-level occurrence was particularly important because it hosts a substantial number of rare and unusual sulfosalts such as baumhauerite, seligmannite, and others.
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| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
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Link
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This
page created: January 11, 2001 |
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