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Formula: Nd2☐Be2Si2O8(OH)2
Nesosilicate (insular SiO4 groups),
gadolinite subgroup,
gadolinite group,
gadolinite supergroup,
beryllium and neodymium bearing mineral
Crystal System: Monoclinic
Specific gravity: 4.690 calculated for the empirical formula
Hardness: 5½ to 6
Streak: White
Colour: Dark greenish-brown
Luminescence: No fluorescence under long wave or short wave UV
Solubility: Does not react with cold hydrochloric or nitric acid
Environments
Metamorphic environments
Hydrothermal environments
Localities
At the type Locality, Zagi Mountain, Hameed Abad Kafoor Dheri, Peshawar District, Khyber Pakhtunkhwa Province,
Pakistan, hingganite-(Nd) forms zones in loose prismatic crystals up to 0.7 cm long, where it is intergrown
with hingganite-(Y). The zonation is occasionally concentric with
hingganite-(Nd) forming the inner zone. In the type specimen, hingganite-(Nd) is associated with
aegirine, microcline,
fergusonite-(Y) and zircon.
It is dark greenish-brown, colourless in thin fragments, and transparent with a vitreous luster and a white streak
(CM 58.5.549-562).
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