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Alpendurada Granite
Macroscopic Description
Two-mica medium grained grayish granite, width some megacrystals of feldspar. |
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Location
District: Porto
Municipality: Marco de Canaveses
Parish: Alpendurada |
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Physic-mechanical properties of the granite
| 1. Compression breaking load |
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1643kg/cm2 |
| 2. Compression breaking load after freezing test |
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1788 kg/cm2 |
| 3. Bending Strength |
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221kg/cm2 |
| 4. Volumetric weight |
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2652kg/m3 |
| 5. Water absorption at normal atmospheric pressure |
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0.20% |
| 6. Apparent porosity |
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0.55% |
| 7. Thermal linear expansion coefficient (maximum value) |
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9.1x10-6/ºC |
| 8. Amsler abrasion test |
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0.2 mm /200m |
| 9. Impact test: minimum fall height |
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65cm |
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Notes
No colour or structural changes on the samples were noticed after the 25 cycles test of frost-defrost carried out. |
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Microscopic Features
| Essential Minerals |
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| Microline |
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~32% |
| Plagioclase |
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~30% |
| Quartz |
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~23% |
| Muscovite + biotite |
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~14% |
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| Accessory Minerals |
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| Apatite, zincon and opaque minerals |
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~1% |
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Microscopic Description
Granitic rock with granular hypidiomorphic texture, showing slight weathering of sericitic type. |
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Chemical Analysis
| SiO2 |
71.75% |
Al2O3 |
14.30% |
Fe2O3(total) |
2.26% |
MnO |
0.03% |
| CaO |
0.91% |
MgO |
0.36% |
Na2O |
3.53% |
K2O |
5.07% |
| TiO2 |
0.19% |
P2O5 |
0.32% |
H2O+ |
0.96% |
H2O- |
0.11% |
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Prevailing Applications
All interior and exterior purposes |
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