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Kubaka ibuye ritukura ryumucanga kurukuta rwinyuma rwometseho amabuye
Ibuye ritukura ryumusenyi nigitare gisanzwe kibona izina kubera ibara ryumutuku. Igizwe ahanini na quartz, feldspar na okiside ya fer, imyunyu ngugu itanga ibuye ryumucanga ritukura ibara ryarwo hamwe nimiterere. Ibuye ryumucanga rishobora kuboneka mubice bitandukanye byubutaka bwisi kandi biboneka ahantu henshi kwisi.
