PSI - Issue 22

J. Gonçalves et al. / Procedia Structural Integrity 22 (2019) 181–188 183 Lígia T. Silva, Bruno Mendes, Carlos Oliveira, Cristin Reis, P ula Silva; José Silva / First International Symposium on Risk and Safety of Complex Structures and Components (2019), Porto, Portugal Table 1 – Mineral composition of the granite “Branco Micaela”.

Mean Value of volumetric amount (estimated) [%]

Volumetric amount (estimated) [Volume %]

Mineral

Quartz

30 - 40 15 - 25 30 - 40

35 20 35

Alkali feldspar Plagioclase

Dark Mica (Biotite) White Mica (Muscovite) Accessories (Apatite, Zircon) Hematite

1 - 3 5 -10

2

7.5 0.2 0.2 0.1

0.2 0.2 0.1

Carbonate

Fig.2 – Polarizing microscopical overview photo micrograph (Source: LGA136-182-EN)