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The rocks which created Nea and Palea Kameni are all lavas of the same type, the minor differences among them being of form rather than composition. All the lavas of these islands belong to the group which geologists call dacites: a volcanic rock whose chemical composition consists of 65-67% silica (SiO~) and 13-15% alumina, with other elements (principally iron, sodium, calcium, potassium and magnesium) in small quantities (2-5%). These elements are found in both the amorphous volcanic glass. and the mineral crystals which, together with the glass, make up these rocks. The principal minerals found in the Kameni dacites are: feldspars: silica-aluminum minerals with white, transparent crystais, - pyroxenes: silica-calcium-iron-magnesium minerals, with crystals varying from dark green to black, and olivines: magnesium-iron-silica minerals, with transparent honey- coloured or dark-green crystals.

The main differences in the appearance of the various lavas are ones of colour, which are due to different cooling rates. The dark-coloured, more fragmented lavas, like most of those forming Nea Kameni, underwent very rapid cooling, with the result that they contain a high percentage of volcanic glass. Slower cooling permits the formation of many minerals, giving the lava a light ashen colour and a more granular texture. Most of the lavas forming Palea Kameni are of this type. Both laboratory studies of the Kameni rocks and all the physicai and chemical parameters measured in the area tend to indicate that the magma which feeds the Kameni volcanic centers is located at a depth of two to four kilometres beneath the islands at a temperature of 950-1000 degrees centigrade, where it is concentrated in small pockets (magma chambers) which in turn are fed with molten rock from deeper layers.

The Volcano of Santorini

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Hydra Island

Welcome to Hellas (Greece) and welcome to Hydra! it's probably impossible to fit all of Hydra's fascinating beauty in this small pamphlet. We have attempted, however, to give a short description of the island that has enough to offer the visitor and guarantees a memorable vacation.

The healthy dry climate, the friendly people, the sparkling warm waters and the picturesque harbor that at sundown transforms into a cosmopolitan city full of sports, scuba diving, trips to the islander historical monasteries, donkey rides in town, shopping In the stores along the harbor, good food in the taverner and restaurants, and all night partying at the bars and music clubs around town.

The high quality and exquisite service characteristic of the hotels and other shops and restaurants fit perfectly the strict standards of the highest class visitors and the jet set from all over the world that come to Hydra every year.

Sponsored by Mistral Hotel

Have a wonderful time...