Hydrated normal phosphate, rhabdophane group
Specific gravity: 4.54 calculated
Streak: Yellowish white
Colour: Yellowish white to yellowish brown
Volcanic igneous environments
Rhabdophane-(Y) was approved as a new mineral in 2011.
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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