According to Alma 3, what material did the Nephites use to build their houses?

TRIV According to Alma 3, what material did the Nephites use to build their houses?

Tt is my will that a house should be built unto me in the land of Zion ... by the tithing of my people. Doctrine & Covenants 97:10

The people ... became exceedingly expert in the working of cement; therefore they did build houses of cement. Helaman 3:7

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