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Formula: Y(PO4).H2O
Hydrated normal phosphate, rhabdophane group
Crystal System: Hexagonal
Specific gravity: 4.54 calculated
Streak: Yellowish white
Colour: Yellowish white to yellowish brown
Environments
Rhabdophane-(Y) was approved as a new mineral in 2011, and to date (May 2023) it has been reported only from
the type locality.
Localities
At the type locality, Hinodematsu, Genkai-cho, Higashimatsuura district, Saga Prefecture, Japan, rhabdophane-(Y)
occurs in a druse of olivine
basalt and covers the surface of the druse or druse minerals. Short
rod-like crystals to 3 microns long forming radial aggregates have been observed. Associated minerals include
plagioclase, forsterite,
augite, enstatite,
magnetite and ilmenite.
Lanthanite-(Nd) sometimes occurs in Hinodematsu, but it is not found in
association with rhabdophane-(Y) in the same druse
(Journal of Mineralogical and Petrological Sciences, 107.110─113).
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