Isku rumi (CaCO3; kastilla simipi: caliza) nisqaqa huk ancha pasqa rumim, Kalsyu chimlasay puchq'uchasqam.
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/4/40/Roca_caliza-limestone_rock.jpg/640px-Roca_caliza-limestone_rock.jpg)
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/2/2e/Flintbeach.jpg/200px-Flintbeach.jpg)
Iskumanta rurasqa k'aspikunata yachay wasikunapi yana qillqana pirqapi qillqanapaqmi llamk'achinchik.
Ancha k'apka, sinchi isku rumitaqa pachar (mármol) ninchik. Chay pachartaqa wasichanapaqmi pirqa rumita hina llamk'achinchik.
Iksu kusaspa kalsyu muksitam (CaO, kusasqa isku, cal viva nisqa) ruranchik. Chay kusasqa iskutaqa wasichaypim llamk'achinchik. Yakuwan chapuspa isku chapusqa ruraptinchik kalsyu yakumuksim (Ca(OH)2) tukukun. Chay kalsyu yakumuksiqa wayra pachapi kaq chimlasaywan ancha k'apka iskutam ruranakuspa kusasqa tikakunata ancha allinta llut'achispa.
Hawa t'inkikuna
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