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A laja is a flat smooth rock , of small thickness. These stones usually used in tiled and in rooftops .

The limestone slabs , shale and sandstone They are among the most used. Many times the use of one or another slab depends on the availability that exists at the regional level. The use of limestone or equisto slab to make roofs of houses is especially common in areas of Montana .

It is understood by equisto to the group of rocks that is characterized by the predominance of minerals laminar, which improve its fragmentation into thin layers. The metamorphic equists , on the other hand, they are metamorphic type rocks, that is, they are formed by the modification of others through the process known as metamorphism.

Another related concept is the limestone , a sedimentary rock that is mainly composed of carbonate of calcium , although it is common 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 consistency and color.

The mycenaeous sandstone tile usually comes from quarries or natural pedreros. Its thickness is greater than that of the slate, a metamorphic rock, 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 sheets or flat slabs. One of its disadvantages is that it has a considerable weight, so that the structure on which it rests must be very rigid.

A name that some experts give to the mycenaeous sandstone tile is fonolito . This is due to the sound it emits when it is struck, which is similar to that of a bell. The word fonolito It consists of two parts: the prefix phone, whose origin takes us back to the Greek language and denotes the concepts of "sound" or "voice", and the suffix -lite, which also comes from the Greek and means "stone."

A example of the use of slabs can be found in the so-called black architecture . In this case slate slabs are used in households , livestock or agricultural structures and even in road infrastructure such as bridges and roads.

The black architecture based on slate slabs It is very common in certain Spanish regions. This is due to the abundance of the board on 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 andesitas precisely because they are some of the ones 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 Chile and to a municipality of Bolivia . In the Chilean case, it is a city 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 It 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 bighead pineapple”) and another of Cuba (whose full name is Saint Elizabeth of Las Lajas ).

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