Faldshpathoids (silicates): Gayuin
Diagnostic card.
(Na, Ca) 8 + 4 (SO 4 ) 2 + 1 (Al SiO 4 ) 6
Cubic amount of cubic zirconia
Hardness 5,5
Specific weight 2.44-2.5
Cleavage is perfect
Cracked shell
Color from light gray to azure blue
Color in powder white
Glitter glass, mother-of-pearl
Its octahedral crystals are often doubled along the faces of the octahedron. The color may be light gray, gray, bluish-green or light azure blue. Chemical composition. Sodium oxide (Na2O) about 15%, calcium oxide (CaO) 10%, aluminum oxide (Al2O3) 28%, silica (SiO2) 33%, tetravalent sulfur dioxide (SO4) 12%, potassium oxide (K2O) 2%, water (H2O) 1% (compare with the sodalite and nosean). The shape of the crystals. Rhombododecahedrons, octahedra (crystals are rare). Class of symmetry. Hexatetrahedral - 43. Cleavage. Good for (110). Aggregates. Dense, granular.
Diagnostic signs.
It is easily decomposed by acids with the release of jelly-like alumina. In the flame of the candle it is easy to melt. It melts with cracking and forms a greenish-blue glass. Behavior in acids. It dissolves.
Origin.
Gayuin is a typical mineral of effusive alkaline rocks of the phonolith type.
Deposits and applications.
Occurs in the volcanic products of Vesuvius; In the region of Lazio - in the gray volcanic tuffs of Mount Monti Albani. As a rock-forming mineral is part of some effusive rocks of Monte Vulture in the Basilicata region. It is present in volcanic bombs on Lake Laach in Rhineland, in an andesite intrusive deposit in Auvergne (France) and in the lava of Jebel Turgedzhid in Morocco.
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Poisonous and radioactive dangerous stones and minerals
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Catalog of minerals and semi-precious stones of the world by groups
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