Crystal stone, sold in Iran as cheeni, is a crystalline metamorphic stone with a white to pale grey ground, formed from limestone under heat and pressure.
Azna, Neyriz and Aligudarz are among the best-known Iranian varieties. It is mostly supplied as large slabs for interior walls, floors and lobbies.
The stone is sensitive to acids and should be cleaned with a neutral cleaner. White setting materials keep dark mortar from showing through.
Choose slabs in person, since each has its own veining, and order consecutive slabs from one block if you plan a book-matched layout.
