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Formula: CuTe4+O3.2H2O
Tellurite, paramorph of
teineite
Crystal System: Monoclinic
Specific gravity:
Streak: Pale green
Colour: Cyan to royal blue
Environments
Millsite is a relatively new mineral, approved in 2015 and to date (July 2024) reported only from the type
locality.
Localities
At the type locality, the Millsite boulder, Gråurdfjellet, Oppdal, Trøndelag, Norway, millsite occurs as a
minor secondary phase alongside
teineite, other copper
secondaries and relict
primary tellurides
in a boulder of quartz-rich
granite, which is probably a glacial erratic. Millsite is
bright cyan to royal blue in colour, transparent to slightly translucent and with a vitreous lustre
(MM 82.433-444).
Associated minerals include teineite,
schmitterite, quartz,
mcalpineite, malachite,
hessite, gold and
goethite
(Mindat).
Millsite from the Millsite Boulder - Image
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