Author Archives: kallisthos

Physical and mechanical characteristics of natural stone

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Natural stone has various physical and mechanical parameters that differ from stone to stone. Let’s have a look at some of them that are most commonly used. Weight per unit of volume = the ratio between the weight and the apparent volume of the stone which corresponds to its actual weight. This also includes the holes […]

The hardness of natural stone

Horizonte-Blog-16112020

Why is it important to know the hardness of natural stone? The hardness of stone can decide, for example, how easily natural stone can be polished, and how long this polishing will last. The so-called Mohs scale is a scale ranging from 1 to 10, with ten being the hardest. This scale is a relative […]

The Green of Tinos

Tinos-Blog

Tinos marble certainly stands out: It is of dark green colour, and heavily veined. It is actively quarried on the Isle of Tinos, which is part of the Cyclades in Greece. Interestingly enough, the island itself is also a source for white marble. Tinos has been used since antiquity; however, the quarries on the island […]

Vratsa

Vratsa

Vratsa derives its name from the largest city in northwestern Bulgaria. The stone is actively quarried in the Vratsa district, particularly around the villages of Gorna Kremena and Varbeshnitsa. Vratsa is a very robust and frost-resistant stone, a fact that explains why it is so often a familiar sight in many countries of central and […]

Thasian Marble

Thasian Marble

Even Seneca already praised the marble from the island of Thasos in Greece, naming it “marmor Thasium”. The marble from Thasos has been quarried since the 5th century BC, and is often pure white and coarse-grained, with resplendent crystals. The location makes it easy to be transported by ship, and the blocks to be obtained […]

Rosa Aurora

Rosa Aurora

Between Estremoz and Vila Viçosa, we can find quarries that are the source of some of Portugal’s best known decorative marble: Rosa Aurora. These marbles are translucent with a granular texture, and their colour can vary a lot from pure white to creamy, orange, and pink. The often delicate background colours are interrupted by streaks […]