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Mineralpedia Details for Bayldonite

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Bayldonite

Bayldonite

An uncommon mineral named for the original collector of the first specimens, English physician John Bayldon. It is a rare to uncommon mineral that can be found in localities in England, France, Ireland, Namibia, Kazakhstan, Australia, and the United States, among a few others. Bayldonite occurs as a secondary mineral in oxidized polymetallic deposits. Associated minerals include mimetite, olivenite, azurite, malachite, tsumebite, cuprian adamite, duftite, keyite, schultenite, philipsbornite, beudantite, alglesite, cerussite, and baryte.

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

Formula
Cu3PbO(AsO3OH)2(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Encrustations, Mammillary, Druse 
Cleavage
None, None, None 
Luster
Greasy (Oily) 
Color
grass green, yellow green, dark green 
Streak
green 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
4.5 
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Bayldonite from San Rafael mine, Nye Co., Nevada, United States

Bayldonite
            from San Rafael mine, Nye Co., Nevada, United States

Apple to dark green crust and individual bead-like crystals covering most of crust and associated with 1mm, light yellow, thin tabular Wulfenite crystals. Identified by Dr. Bill Wise several years ago in the "copper adit" of the 350 level and recently confirmed again by microprobe analysis.

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Bayldonite from Tsumeb mine, Tsumeb, Namibia

Bayldonite
            from Tsumeb mine, Tsumeb, Namibia
Special Info
Raman

Bluish-green stubby Bayldonite crystals to about 1mm with tiny bright green Duftite crystals. T

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

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

Bright lime green spherulitic crystals of Bayldonite. 

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