[Apostle John Henry Smith]
... examined the foundation of the Temple and the Walls. The Mineral is eating away even the black rock as it does the sand stone. The foundation of the Tabernacle is being very badly damaged.
[Jean Bickmore White (editor), Church, State, and Politics: The Diaries of John Henry Smith, Signature Books in association with Smith Research Associates, Salt Lake City, 1990, http://bit.ly/johnhenrysmith]