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Nkume owuwu na-acha uhie uhie maka mgbidi mputa na-ekpuchi tile nkume
Nkume aja na-acha uhie uhie bụ nkume sedimentary nkịtị na-enweta aha ya n'ihi agba uhie ya. Ihe mejupụtara ya bụ quartz, feldspar na iron oxides, mineral na-enye aja aja uhie njirimara agba na udidi ya. Enwere ike ịhụ nkume aja na-acha uhie uhie na mpaghara dị iche iche nke ụwa ma dị n'ọtụtụ ebe gburugburu ụwa.
