Rowlandite-(Y)

rowlandite-(Y)

gadolinite

yttrialite

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Formula: Fe²⁺Y₄(Si₂O₇)₂F₂
Sorosilicate (Si₂O₇ groups), yttrium-bearing mineral
Crystal System: Triclinic
Specific gravity: 4.33 calculated
Hardness: 5½' to 6½
Colour: Pale dull green, greyish white
Environments

Pegmatites

Localities

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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