Miserite

miserite

wollastonite

eudialyte

baratovite

Images

Formula: K1.5-x(Ca,Y,REE)5[Si6O15][Si2O7](OH,F)2.yH2O
Inosilicate (chain silicate)
Specific gravity: 2.84 to 2.93
Hardness: 5½ to 6
Streak: White
Colour: Pink, red-brown, raspberry-red
Solubility: Insoluble in hydrochloric, nitric and sulphuric acid (CM 11.569)
Melting point below 1400oC (CM 11.569)
Common impurities: Al,Y,TR,La,Pr,Nd,Eu,Dy,Er,Tm,Yb,Lu,Fe,Mn
Mildly RADIOACTIVE
Environments

Plutonic igneous environments
Carbonatites
Metamorphic environments

Localities

At the Kipawa alkaline complex, Les Lacs-du-Témiscamingue, Témiscamingue RCM, Abitibi-Témiscamingue, Québec, Canada, miserite occurs as red-brown cleavage masses in a carbonatite vein, closely associated with dark green hornblende, pink eudialyte, scapolite, fluorite and mosandrite (CM 11.569, HOM).

At Dara-i-Pioz Glacier, Districts of Republican Subordination, Tajikistan, miserite occurs in quartz-albite-aegirine veinlets and in albitites in syenites. Associated minerals include baratovite, ekanite and titanite (HOM).

At the type locality, the North Wilson pit, Union Carbide Mine, Wilson Springs, Garland county, Arkansas, USA, miserite occurs as a constituent of banded metamorphosed shale at the contact with a dike of nepheline syenite. The shale contains the apple-blossom pink to pale rose miserite and white wollastonite crystals. The metamorphosed and indurated shale is composed essentially of orthoclase, aegirine, wollastonite and miserite. The miserite is fine-grained fibrous, and the compact aggregates form slightly curved, scaly masses several inches in diameter but rarely more than a quarter of an inch thick. Commonly it is in the white wollastonite, at many places forming a border zone between the wollastonite and the greenish host rock, which is much seamed with veinlets of wollastonite with or without miserite, and of aegirine. Many fragments of wollastonite are penetrated by long, slender prisms of miserite that, when abundant, form aggregate pseudomorphs after wollastonite (AM 35.911-921, HOM).

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