A slab is a smooth, flat rock, of little thickness. Are stones are usually used in paved and in rooftops.
The limestone slabs, shale and sandstone They are among the most used. Many times the use of one or the other slab depends on the availability that exists at the regional level. The use of limestone or equisto slab to make house roofs is especially common in areas of Mountain.
It is understood by equisto to the group of rocks characterized by the predominance of minerals laminar, which improve their fragmentation in thin layers. The metamorphic equistosOn the other hand, they are metamorphic rocks, that is, they are formed by the modification of others through the process known as metamorphism.
Another related concept is limestone, a sedimentary rock that is composed mainly of carbonate of calcium, although it is common for it to have traces of other carbonates, such as magnesite. Limestone can also have in its composition a certain percentage of minerals such as hermatite, clay, quartz and siderite, which can modify its degree of coherence and color.
The micaceous sandstone tile usually comes from quarries or natural stones. Its thickness is greater than that of shale, a rock also metamorphic, although homogeneous, with a fine grain, which is formed by compacting shales by low-grade metamorphism. Usually its color is dark blue and its material is opaque. It usually has a structure of flat sheets or slabs. One of its disadvantages is that it has a considerable weight, so the structure on which it rests must be very rigid.
A name that some experts give to the micaceous sandstone tile is phonolith. This is due to the sound it makes when struck, which is similar to that of a bell. The word phonolith consists of two parts: the prefix phone-, whose origin goes back to the Greek language and denotes the concepts of “sound” or “voice”, and the suffix -lito, which also comes from the Greek and means “stone.”
A example of the use of flagstones can be found in the so-called black architecture. In this case, slate slabs are used in households, livestock or agricultural structures and even road infrastructure such as bridges and roads.
Black architecture based on slate slabs it is very common in certain Spanish regions. This is due to the abundance of blackboard in the zone, which helped define the architectural style of the place.
Some of the slabs come from volcanic areas, and these are part of the group known as Andesites precisely because they are one of those that stand out in the Andes mountains. Thanks to the presence of some minerals, such as iron and manganese oxide, in certain rocks a reddish, greenish or bluish hue can be seen on a base that is usually gray.
Laja It is also the name that identifies a commune of chili already a municipality of Bolivia. In the Chilean case, it is a town which is part of the province of Biobio. It has more than 22,000 inhabitants and has several lagoons among its main tourist attractions.
In the Bolivian territory, meanwhile, Laja is a town in the province The Andes, in the department of Peace. It is located at a distance of 35 kilometers from the city of Peace, 3860 meters from altitude. Some 24,000 people live in Laja.
Lajas (plural), finally, is a municipality from Puerto Rico (It is known as “The town of the big-headed pineapple”) and another of Cuba (whose full name is Santa Isabel de las Lajas).