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Porphyry Plates - Prices & Tips for Laying & GroutingPorphyry is not a specific material, but a collective term for volcanic rocks with large crystals enclosed in them. They develop naturally, as magma slowly cools in the interior of the earth.
Larger crystals form, which initially swim in the magma.
Where does porphyry come from?
In a volcanic eruption then the entire mass is thrown out of the volcano and cools down quickly. The liquid fractions produce very small crystals, the finer the faster the mass cools. The larger crystals are enclosed and form so-called Einsprenglinge, which have a size of a few millimeters to a few centimeters and look crystal-like.
Porphyr is differentiated according to its quartz content. In the quartz-rich porphyry the Einsprenglinge are quartz crystals, which is why it is also called quartz porphyry or rhyolite. In quartz-poor porphyries little or no quartz may be present. These include rocks such as trachyte, dacite, andesite and ignimbrite. These rocks are also quite common in Germany.
Use of porphyry
Porphyry is used in the house mainly in the form of plates. Because of their origin, such plates are usually available only in smaller dimensions. They can be used very well for a walk in the outdoor area, the terrace or the inner courtyard, but by polishing it is also possible to achieve a very decorative surface that is also suitable for indoor use.
Earlier such rock was often endowed in sacred art or for noble
Spaces used in palaces. The word porphyry comes from ancient Greek and translated means purple, because of its color he was allowed to be used in some times only for the emperor.
Lay porphyry tiles in the garden
Porphyry is a very resistant stone that can withstand high loads. Heat, frost and acid do not hurt him, so he likes to be used outdoors.
- As a substrate for a path made of porphyry slates gravel is well suited, with which the path is filled to the depth of frost of 80 centimeters and then compacted.
- Before laying the panels should be washed off so that the mortar can hold well.
- Then the mortar layer is applied to the gravel, the plates are laid up and tapped with a rubber mallet.
- Then the stones are grouted, using as possible a spatula or the grout material should be poured liquid into the interstices, because it is difficult to remove from the surfaces of the plates.
- Once the joints have become reasonably firm, the plates should be roughly cleaned.
- After the final curing of the joints, the plates can then be carefully cleaned again.
Porphyry plates are available as polygonal plates, which are quite irregular in shape and have different sizes, then they cost from ten euros per square meter. But they are also available rectangular cut to size, then they are available from about 60 euros per square meter. Due to the natural formation, each plate looks different, resulting in a slightly irregular appearance.