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Formula:Cu31S16
Sulphide
Crystal System: Orthorhombic
Specific gravity: 5.749 calculated
Hardness: 2½ to 3
Streak: Black
Colour: Black, grey in reflected light
Common impurities: Ag,Fe
Environments
Djurleite is very similar to chalcocite and it is difficult to
distinguish between them.
Djurleite occurs in the secondary enrichment zones of
copper deposits (Mindat, Webmin, HOM), associated with
digenite, bornite,
chalcocite, chalcopyrite,
anilite and pyrite
(HOM, Mindat).
Localities
At Red Gill mine, Caldbeck Fells, Cumbria, England, UK, djurleite has been confirmed. Grey copper sulphides are
quite common here as small blebs in quartz and often occur as replacements of
chalcopyrite and galena, indicating
a period of supergene enrichment at this site. Several of the
early linarite specimens have relatively large amounts of grey copper
sulphide in their matrix
(JRS 11.36).
Near Groby, Leicestershire, England, UK, a specimen from Bradgate Middle Quarry contains djurleite as a
finely-intergrown mixture with bornite and minor
hematite
(JRS 14.54).
At Lane’s Hill Quarry, Stoney Stanton, Leicestershire, England, UK, djurleite has been found embedded in
iron-rich dolomite with minor quartz
(JRS 20.14).
At the California State Gem Mine, Santa Rita Peak, New Idria Mining District, San Benito county, California, USA,
djurleite has been found with benitoite
(MP#3 p8).
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