Andalucita

Andalucita
Andalucita
Fórmula químicaAl2SiO5
ClaseSilicatos
SubclaseNesosilicatos
Sistema cristalinoRómbico
CorAgrisada, marrón, verde, rosa, violeta e vermella
BrilloDe vítreo a terroso
Dureza7,5
FracturaDesigual
ExfoliaciónMoi imperfecta
RaiaBranca
Densidade3,17 g/cm3

A andalucita[1] é un mineral da clase dos silicatos cuxa fórmula química é Al2SiO5 e que presenta moi variada coloración.

Aspecto

De moi variada coloración, rara vez aparece na súa forma cristalina aínda que pode aparecer, de cando en vez, en forma de prismas de catro caras.

Lugares onde se atopa

A andalucita é un mineral que crece en zonas de forte presión e temperatura. Faino en rochas de tipo metamórfico como os xistos. Os minerais cianita e silimanita, polimorfos da andalucita, fórmanse baixo unhas condicións de presión e temperatura diferentes. Polo tanto, e difícil que os poidamos atopar xuntos nunha mesma rocha. É por iso polo que os tres minerais son unha ferramenta valiosa para identificar as condicións de presión e temperatura da rocha nai nas que se atopan.

Atópanse exemplares de andalucita en xisto en Lariño (A Coruña) e tamén en Boal, Asturias[2].

Usos da andalucita

A andalucita é empregada para a fabricación de refractarios, materiais coa capacidade de soportar altas temperaturas.

Outros silicatos

O cuarzo, a olivina, o feldespato e a mica son outros silicatos importantes.

Notas

  1. ↑ "andalucita". TERGAL. Consultado o 01/07/2022. 
  2. ↑ Manuel Gutiérrez Claverol e Carlos Luque Cabal Recursos del subsuelo de Asturias. Servicio de Publicaciones Universidad de Oviedo, 1994, páxina 269

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