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Cu3(CO3)2(OH)2
Monoclinic
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| Figure 23-15. Crystal drawings of azurite from Franklin. These are two projections (A and B) of one crystal. Drawings are from Palache (1935) who provided crystallographic data. | ||
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Azurite, a copper carbonate hydroxide mineral, was first described from Franklin by Vanuxem and Keating (1822b) as “blue carbonate of copper” and later was described by Palache (1928a, 1935). It is also found at Sterling Hill.
Azurite occurs as very fine, albeit small (1-3 mm) crystals, which were measured, described, and extensively illustrated by Palache (1928a, 1935). The abundant crystal drawings should not be taken as an indication of abundant azurite; it was uncommon locally. Azurite is deep blue, although light-blue films have been verified from Sterling Hill. No physical, optical, or chemical data exist for local specimens.
Azurite was found associated with malachite, goethite, aurichalcite, and rarely rosasite or hemimorphite at the north end of Mine Hill in Franklin. The matrix for many specimens is severely altered; in general, only goethite remains as a visible matrix mineral. For other specimen matrixes, magnetite persists with calcite; this assemblage may have been derived from parent chalcocite-magnetite intergrowths. Palache (1928a, 1935) noted that his specimens came from the 200 level at Franklin.
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| Figure 23-16. Crystal drawing of azurite from Franklin. Drawing is from Palache (1935) who provided crystallographic data. | Figure 23-17. Crystal drawings of azurite from Sterling Hill; these are two projections (A and B) of one crystal. Drawings are from Palache (1935) who provided crystallographic data. | |||
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Similar specimens are known from Sterling Hill, commonly in veins. Some specimens seem to have formed from the alteration of chalcocite, bornite, or chalcopyrite. The associated minerals are the same as at Franklin, with the addition of sparse serpentine.
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| Figure 23-18. Crystal drawings of azurite from Sterling Hill. These are two projections (A and B) of one crystal. Drawings are from Palache (1935) who provided crystallographic data. | ||||
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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 13, 2001 |
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