The bottom periphery, 0.5 km wide, is mostly built of feldspathic rocks and little or no carbonatite.
12.
All alumina cores are layered with tooth tissue-like feldspathic porcelain to make true-to-life color and shape.
13.
Sometimes granular augite or spongy riebeckite occurs in the groundmass, but as a rule this part of the rock is highly feldspathic.
14.
Traditionally, all-ceramic restorations have been made off site in a dental laboratory either out of feldspathic porcelains or pressed ceramics.
15.
Formulations were later developed based on kaolin ( china clay ), quartz, feldspars, nepheline syenite, and other feldspathic rocks.
16.
Apart from recent alluvial deposits, the other main rock in the valley is Hauturu Sandstone, which is mid to late feldspathic sand
17.
Many of the feldspathic lunar meteorites probably originated from the lunar far side, and impact melts within these have recently been dated.
18.
Most chondrules are composed primarily of the silicate minerals olivine and pyroxene, surrounded by feldspathic material that may either be glassy or crystalline.
19.
The zirconia core structure can be layered with tooth tissue-like feldspathic porcelain to create the final color and shape of the tooth.
20.
The conglomerates consist of grey feldspathic sand and well-rounded pebbles and cobbles of quartzite, granite, felsite, and quartz monzonite.
