The Magic of Minerals by Professor Dr. rer. nat. Harry Wilk (auth.), Professor Dr.

By Professor Dr. rer. nat. Harry Wilk (auth.), Professor Dr. rer. nat. Harry Wilk (eds.)

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The law gains importance since most crystals are only rarely found in ideal, fully symmetrical form, most being more or less severely distorted. The ideal crystal form can be immediately reconstructed. To measure the crystal angles one uses a goniometer. The respective faces measured must be at right angles to the goniometer in order to 34 determine the interfacial angles. These are important, definitive constants that are presented in angle tables, which enable the identification of the crystal faces.

Diamonds of poor color may be irradiated with neutrons from atomic reactors to change them to green, yellow, or brown, and they may be changed to blue by accelerated electrons from a van-de-Graaff generator. Some speciallight effects, not dependent upon color, but emphasizing it, should also be mentioned here. These are caused by numerous oriented thin hollow channels, oriented precipitates of included foreign crystals, or are interference phenomena in lamellar structures. Chatoyance, or the cat's-eye effect, is the reflection of light in the form of a lighter-colored line that may be observed on the curved surface of some cabochon-shaped stones.

Aragonite 20. Barite 21. l2f"::::::y- - - -.... b / a={3= y=90° I c p 1~ ~*-b orthorombic a*b*c a={3= y=90° 18. Sulfur c b monoclinic a*b*c a= y=900; {3*90° 22. Orpiment 23. Augite 24. Orthoclase c b triclinic a*b*c * * y* 90° a {3 17 Pyrite on Calcite Trepca/Yugoslavia Original size 24 x 27 mm 25. Chalcanthite 26. Rhodonite 27. Plagioclase • Pyrite - FeS Isometric. The name pyrites was given to the mineral by Dioskurides (50 A. ) and means firestone in both Greek and Latin. The ancients thought that the mineral contained fire that was released in the form of sparks when it was struck.

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