Home > Kalahari Manganese Field – March 18 > MS0904 Portlandite

Portlandite - Sold

Portlandite is simple calcium hydroxide. Tilley (1933) named the mineral portlandite since the artificial compound forms by hydration of Portland cement. Although portlandite has a modest solubility in water, it is sufficiently stable to store in a humid climate. The mineral has hexagonal symmetry and is a member of the brucite group. It forms soft foliated masses, here stark white. This is rare material. This specimen carries a Carter Rich label.