(1) It is perched on a plateau of tufa rock, almost like it's been carved straight from its roots.(2) All were so-called tufa towers, formations of calcium carbonate deposited by the mineral-rich lake water, which is two and a half times saltier than seawater and eighty times more alkaline.(3) It's an otherworldly site, fringed with dunes and studded with bone-white calcium carbonate spires called tufa towers.(4) The unmatching plates and bowls include some made of stone or tufa .(5) Contemporary Armenian architecture has followed the basic characteristics of its historical architectural tradition: simplicity, reliance on locally available geological material, and the use of volcanic tufa for facings.(6) Along the shoreline, pinnacles of calcium carbonate deposits, called tufa , glare white in the sunlight.(7) Among the 30 different types of stone recognized are varieties of diorite, granite, bedded tuff, sandstones, limestones, and tufa .(8) Local building materials, such as the volcanic tufa , did not lend themselves to the structural complexities of French gothic vaults, and, like most gothic churches in Italy, these were relatively simple.(9) These deposits, which are associated with mineral springs, are doubtless more or less tufaceous in character.(10) It was and still is a very little town, built on a tufaceous rock and accessible only from one point.(11) The various shades of red of the tufaceous cut stone used in the construction form a striking contrast with the deep blue waters of the lake and the snow-capped majestic mountains in the background.(12) The valley cuts through beds of reddish and brown tufaceous rock, the lower levels of which are fairly soft.(13) The lower limestone is impure and tufaceous , but similar in texture to the typical Oamaru building-stone.
