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Formula: PbNd(CO3)2(OH).H2O
Hydrated carbonate, ancylite group,
ancylite supergroup,
neodymium-bearing mineral
Crystal System: Orthorhombic
Specific gravity: 4.82 calculated
Hardness: 4 to 4½
Streak: White to light pink
Colour: Light pink to reddish pink
Luminescence: No fluorescence observed under long wave or short wave UV
Solubility: Soluble with effervescence in cold dilute hydrochloric acid
Environments
Gysinite-(Nd) is a rare secondary mineral in the oxidised
portions of rare earth-bearing lead
deposits, the rare earths perhaps supplied from altered
uraninite
(HOM).
Localities
From the type locality, the Kasompi Mine, Mutshatsha, Lualaba, DR Congo, gysinite was discovered on a single
specimen from the mineral collection at the Geneva Natural History Museum, labeled
"schuilingite from Shinkolobwe, Shaba, Zaire", but it was
subsequently thought to be more likely from the Kasompi Mine.
Gysinite is translucent, light pink to reddish pink in colour, with a vitreous to greasy lustre and a white
to light pink streak. It occurs as isolated single crystals, crystal aggregates and penetration twins. Associated
minerals include malachite,
cerussite, talc,
chlorite, bornite,
wulfenite, kasolite,
native gold, garnet and
schuilingite-(Nd).
(AM 70.1314-1317).
Gysinite-(Nd) from the Kasompi Mine -
Image
At Sa Duchessa Mine, Domusnovas, South Sardinia Province, Sardinia, Italy, associated minerals include
chrysocolla, agardite-(Y),
philipsburgite and theisite
(HOM).
Gysinite-(Nd) from the Sa Duchessa Mine -
Image
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