"' Llanite "'is a hypabyssally intruded variety of rhyolite with phenocrysts of microcline and euhedral quartz.
12.
It crystallizes in the hexagonal crystal system and has been found as primary euhedral di-rhombohedral, pseudo-octahedral crystals.
13.
Biotite ( usually phlogopite ) and amphibole ( usually pargasite or other magnesian hornblende ) are panidiomorphic; all are euhedral, well formed.
14.
The lack of cleavage, commonly euhedral crystal morphology, and mineral associations should also be used in identification of pyrope under the microscope.
15.
The main arguments for this hypothesis are the relics of chondrules, the euhedral enstatites surrounded by meteoric iron and the occurrence of keilite.
16.
It is a somewhat rare mineral sought after by collectors as it typically forms euhedral isometric crystals exhibiting various cubes, octahedra, and dodecahedra.
17.
Skaergaardite can appear in various forms including : droplets; cubic grains with rounded outlines; euhedral to subhedral grains; and irregular grains or aggregates.
18.
The flat faces ( also called facets ) of a euhedral crystal are oriented in a specific way relative to the underlying planes of relatively low Miller index.
19.
Framboidal structure comprises roughly spherical aggregates of discrete equi-regular euhedral microcrystallites of around 0.5 ?m in diameter, with the average aggregate size ranging from 5-20 ?m.
20.
Where leucite occurs, it is always euhedral in small, equant, many-sided crystals in the ground mass, or in larger masses which have the same characters as the pseudoleucites.
