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General
- 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.
Process
- 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.
Report
- 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.
Application
- 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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