Quartzite y'umukara mwiza ni granite yijimye kandi iramba. Ibara ryayo ry'ibanze ni umukara wijimye, w'umukara cyangwa umukara wijimye. Ikiranga cyane ni imiterere y'utudomo duto tw'ifeza cyangwa umweru (utubuye twa feldspar) hamwe n'uduce twa mica dusa n'urumuri, gisa n'urumuri rwijimye, ruzunguruka mu kirere cyijimye nijoro. Izi kristali zirabagirana mu mucyo, zigatanga uburebure n'imiterere yihariye, bitandukanye na granite imwe n'imwe y'umukara gusa, ishobora kugaragara nk'irambira.
Quartzite y'umukara itangaje ni ibuye ry'ibirunga rikomeye cyane kandi rikomeye, rifite ubushobozi bwo kwangirika no kwihangana. Ubuso bwaryo bukunze gusigwa neza kugira ngo rigaragaze ibara ryaryo n'ububengerane bwa kristale. Yaba irikozwe mu ibara rya quartzite y'umukara cyangwa iy'uruhu, igaragaza ubwiza bwayo.
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