Pirofilita

18/09/2013 443 Palabras

PirofilitaGeneralCategoríaMinerales filosilicatosClase9.EC.10 (Strunz)Fórmula químicaAl2Si4O10(OH)2Propiedades físicasColorVerde pardo, verde gris, verduzco, blanco gris, amarillo parduzcoRayaBlancaLustreNacaradoTransparenciaTransparente a translúcidoSistema cristalinoMonoclínicoHábito cristalinoCristales >3 mm, tabular, usualmente hojoso, lamelar, fibroso, granularDureza1,5-2Densidad2,85 g/cm3 Silicato alumínico hidratado, Al2 [(OH)2 /Si4 O10 ], rómbico, p.o e. 2,8 y dureza 1,5. Infusible al soplete y difícilmente atacable por el ácido sulfúrico.

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