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Characterization and isolation of a natural stilbite from Atacama region, Chile.

Fecha de publicación:
Química y Biología
Datos de publicación:
BOLETIN DE LA SOCIEDAD CHILENA DE QUIMICA Volumen: 45 ( 4 ) pp: 569-575, 2000
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Base de datos:

The properties of natural stilbite from the Atacama region of Chile are described in this work. This mineral shows colorless, white and honey-brownish shades, and it presents pearly and vitreous luster with a radial crystallization form. The results from the physical and chemical characterization are the following: Mohs hardness = 3-4, specific gravity = 2.05, mass loss by heating = 17.4% and mass loss by HCl dissolution = 35.5%. The chemical composition is Na (0.59%), Ca (5.64%),Al (9.40%), Si+O (66.93%), H2O (17.44%).The X-ray diffraction patterns match also very well with stellerite, a Na-free orthorhombic zeolite (stilbite is recognized as monoclinic), suggesting the presence of two different crystal growing sectors. The IR spectrum shows the characteristic O-H stretching and bending and the symmetric and asymmetric T-O (T: Si, Al) stretching absorption bands. Gravitational combined with magnetic separation methods seems to be appropriated for separating the stilbite from the associated gangue.

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Atribución-SinDerivadas 3.0 Chile (CC BY-ND 3.0 CL)
Except where otherwise noted, this item's license is described as Atribución-SinDerivadas 3.0 Chile (CC BY-ND 3.0 CL)

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