Formula: Fe2+Y4(Si2O7)2F2 Sorosilicate (Si2O7 groups), yttrium-bearing mineral
Specific gravity: 4.33 calculated
Hardness: 5½' to 6½
Colour: Pale dull green, greyish white
At the type locality, the Baringer Hill mine, Bluffton, Llano county, Texas, USA, rowlandite-(Y), a rare metamict yttrium silicate, occurs commonly in nine of the twelve rare-earth pegmatites in the district. Irregular masses up to 1 cm in size occur associated with gadolinite-(Y) and yttrialite-(Y) (for which this is also the type locality). The rowlandite-(Y) is either glassy, translucent, and bottle-green, or a vitreoous scarlet colour (AM 63.754-756).
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