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  • Staurolite is a red brown to black, mostly opaque, nesosilicate mineral with a white streak.
  • It crystallizes in the monoclinic crystal system.
  • A special property of staurolite is that it often occurs twinned in a characteristic cross-shape.


  • Metamorphie processes observable in the upper earth 's crust comprise reactions in asolid state, reequilibration,degassing, partial melting and re-hydration reactions.
  •  The metamorphic processes change density, texture, and modal mineralogy.


  • The Porto-Viseu Belt, located in the innermost zone of the Iberian Variscan Fold Belt the Central Iberian Zone (CIZ), corresponds to an antiformal structure developed during the D3 Variscan deformation event.
  • Microstructural criteria indicate that the growth of the Barrovian index minerals is syn-kinematic with D1 structures and, in the deeper levels, early to syn-D2.


  • Staurolite is one of the index minerals that are used to estimate the temperature, depth, and pressure at which a rock undergoes metamorphism.
  • Staurolite is a common metamorphic mineral that is useful to geologists to determine the degree of metamorphism.

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