Aegirine Thin Section

This is a thin section of a rare rock from the khibiny area of the kola peninsular.

Aegirine thin section. In canada outstanding specimens often associated with rare minerals comes from the quarries at mont st. The brown varieties may have acute or sharply pointed terminations. Large number of pages viewed.

Sample jb8 thin section rollover image of aegirine crystal surrounded by perthite and quartz in plane polarized light and cross polarized light. In the u s the premier aegirine locality is magnet cove garland co arkansas where slender crystals can be found crisscrossing in a light colored matrix. Variously described in the texts an nordmarkite and pulaskite it is part of an alkaline intrusion.

Eight sided cross sections show both cleavages at about 87. The thin section shows this to be a coarse grained granite rich in aegirine a sodium rich pyroxene with unusual patchy green colouring and pleochroism ranging from green to straw yellow. Thin section rollover image of aegirine with perthite and quartz in plane polarized light and cross polarized light.

This is a thin section microscope slide of a quartz syenite from ben loyal highlands scotland. This area is the home to many very special minerals formed by the intrusion of an alkali syenite into existing pre cambrian rocks. The feldspar shows evidence of extensive exsolution to orthoclase and plagioclase and is mottled when viewed in plane polarised light.

Aegirine form stubby to quite elongate prisms.