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Rui Nunes' Photos
JRT-N2VSmithsonite ZnCO3 , Descloizite PbZn(VO4)(OH)
Field of View: 11 cm
Pearly smithsonite with small black descloizite crystals on a limonite matrix.
Rui Nunes’ specimen and photo, October 2026.
D7N-MR1Smithsonite ZnCO3 , Descloizite PbZn(VO4)(OH)
Field of View: 10 cm
Pearly smithsonite with small black descloizite crystals on a limonite matrix.
Rui Nunes’ specimen and photo, July 2011.
2KA-RFKOpal SiO2·nH2O , Serpentine Subgroup D3[Si2O5](OH)4
Dimensions: 19 cm x 15 cm
Caramel-brown opal veins in a serpentine matrix. Specimen from the collection of Eng. Miguel Montenegro de Andrade, shared with his kind permission.
Rui Nunes, October 2026.
NV3-67QScheelite Ca(WO4) , Quartz SiO2
Field of View: 10 cm
A very rich scheelite specimen on quartz, photographed under shortwave UV light.
Specimen and photo by Eng. Miguel Montenegro de Andrade, shared with his kind permission in October 2026.
00H-N99Orbicular diorite
Dimensions: 27 cm x 20 cm
Orbicular diorite from Montemor-o-Novo, one of the rarest and most remarkable Portuguese igneous rocks. It displays an unusual orbicular texture, consisting of concentric mineral layers arranged around central nuclei.
Specimen collected by the late Professor Dr. Miguel Montenegro de Andrade.
H1Y-HNUPyrite FeS2
Largest Crystal Size: 40 mm
A pyrite cluster, with the largest crystal as mentioned above. This specimen most probably originates from the Ampliación a Victoria Mine. It is part of the mineral collection of Eng. Miguel Montenegro de Andrade. Photo shared with his kind permission.
Rui Nunes, October 2026.
GTA-9FWGypsum (Var: Selenite) CaSO4·2H2O
Largest Crystal Size: 37 cm
Relatively large selenite crystals have been found in this gypsum quarry at Souta da Carpalhosa. This specimen is part of Eng. Miguel Montenegro de Andrade’s private collection.
Photo shared with his kind permission in October 2026.
432-P8MQuartz SiO2 , Fluorite CaF2
Field of View: 15 cm
A quartz crystal cluster with a cavity filled with clear, almost colourless lilac fluorite crystals, in the personal collection of Eng. Miguel Montenegro de Andrade.
Photographed in October 2026 and shared with his kind permission.
N1N-83FAmphibole Supergroup (Var: Byssolite) AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Dimensions: 12 cm x 9 cm
A hair-like mass of byssolite fibres collected by Prof. Montenegro de Andrade and his son, Miguel Montenegro de Andrade, during the active mining period (1960–1970) at this classic Portuguese locality.
Salir do Porto Cave
The small but beautiful Salir do Porto Cave was formed in carbonate rocks (limestone and dolomite) through karstification. It was discovered in the 1960s during quarrying operations at a local lime quarry that was still active at the time.
Photo courtesy of Eng. Miguel Montenegro de Andrade, taken during his visit in 1967.