Italy, Lombardia, Bergamo prov., Selvino


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Selvino - Bergamo province, in the North of Italy - is a famous locality for quartz (floater), found in XX of different and complex shapes, always doubly terminated, in the dissolved metamorphosed sedimentary rocks. They have a hydrothermal origin and show, often, solid/liquid/volatile inclusions, within internal bubbles and fractures.
I have 82 pieces from this site (5 are on matrix, a rarity), here is a selection of them
Link with the friend website (in Italian language) "I Quarzi di Selvino". Photogallery and a clear introduction to the geological formations around Selvino:

 




Quartz
Typical double terminated X, fat, 4 cm long, with three phase inclusions. There are gas/liquid bubbles and solid black inclusions of hydrocarbons. It is possible to see the black material moving within the internal fractures (there is a negative X inside). The oil inclusions fluoresce under light
4x2.6cm
Selvino, Bergamo. Italy
Specimen n.1483

2nd photo
3rd photo
4th photo

 

Quartz
Two inter-grown XX, up to 4.2cm long; the upper one is covered by a yellowish oxide
4.5x3.2cm
Selvino, Bergamo. Italy
Specimen n.246




Quartz
This X, 3.2 x 2.2 cm wide, is posted within a fracture of the rock filled with dolomite XX
11x6.5cm
Selvino, Bergamo. Italy
Specimen n.932

Other photos

 

Quartz
2 XX in a parallel formation, 1,9cm and 1.1cm long
1.9x1.4cm
Selvino, Bergamo. Italy
Specimen n.914

 

Quartz
Single X, very transparent. Few and small internal fractures
2.5x1.5cm
Selvino, Bergamo. Italy
Specimen n.251

 

Quartz
Another perfectly formed, water clear X, 2.5cm long
2.5x1.1cm
Selvino, Bergamo. Italy
Specimen n.912

 

Quartz
A combination of a main X, 1.9cm, and another oblique X 1.4cm long. Both are very transparent
2.1x0.9cm
Selvino, Bergamo. Italy
Specimen n.913

 

Quartz
2 XX, glassy, linked together, 2.2cm and 1.3cm long
2.8x1.4cm
Selvino, Bergamo. Italy
Specimen n.915

2nd photo

 

Quartz
2 XX with a light  yellow coating, 2.7cm and 1.9cm long. The bigger has a clear distortion on a tip
2.9x1.3cm
Selvino, Bergamo. Italy
Specimen n.916

 

Quartz
An irregular combination of XX, the main one has a tip strongly deformed
4.8x1.8cm
Selvino, Bergamo. Italy
Specimen n.917

 

Quartz
A small XX, well formed and transparent - 1.1cm long - grown on a bigger one, deformed and with internal factures
2.1x2cm
Selvino, Bergamo. Italy
Specimen n.918

 

Quartz
Two crossed XX, the bigger is 3.1cm long
3.5x1cm
Selvino, Bergamo. Italy
Specimen n.306

 

Quartz
A not infrequent formation: a small X, on the top of a bigger one. Inside, there is a negative X, difficult to see without a lens
3.9x1.1cm
Selvino, Bergamo. Italy
Specimen n.534

 

Quartz
A large biterminated X is surrounded, on both the tips, by two small XX. A nice merge among three pieces. The main X shows inclusions of black hydrocarbons, not visible in this photo
3.5x1.5cm
Selvino, Bergamo. Italy
Specimen n.901

 

Quartz
Another curiosity from Selvino. It is a combination of 4 XX: the main central, two at the opposite sides. One of them is clearly visible (on he right - 0.9 cm long), the other (on the left) is revealed by the small step in the lower side.  The smaller X is posted centrally, obliquely
3.5x1.2cm
Selvino, Bergamo. Italy
Specimen n.919

2nd photo
3rd photo

 

Quartz
A merge between two XX, both biterminated, with different dimensions, 0.9 cm large the bigger and 0.5 cm the other
3.5x1cm
Selvino, Bergamo. Italy
Specimen n.902

 

Quartz
A water-transparent X, with a clear negative X inside
3.1x1.3cm
Selvino, Bergamo. Italy
Specimen n.903

 

Quartz
Three  biterminated XX, linked together (the bigger is 2.4 cm long), transparent, one of them with a nice clear yellow coating
2.6x2cm
Selvino, Bergamo. Italy
Specimen n.904

 

Quartz
Cruciform twin, small but perfect
2.1x2.1cm
Selvino, Bergamo. Italy
Specimen n.905

 

Quartz
A small X (0.8cm long) grown on a surface of a bigger biterminated transparent X 
4x2.6cm
Selvino, Bergamo. Italy
Specimen n.908

 

Quartz
Single X, very thin (0.7cm), with a lot of internal fractures, on a small amount of matrix
3x1.3cm
Selvino, Bergamo. Italy
Specimen n.906

 

Quartz
It is not common to find quartz on matrix: in this piece, the X (2.2x1.2cm) stands in a cavity, on the dolomite matrix (it is possible to see small dolomite XX, edge up to 0.4cm), with some coverage of hydrocarbons  
10x6.5cm
Selvino, Bergamo. Italy
Specimen n.244

Another photo: different view

 

Quartz
A big X (4.8x3.8cm) on a calcite matrix (malformed XX up to 3.5cm). It has a lot of internal fractures and solid inclusions of lime and hydrocarbons, so it is not transparent
10x6.5cm
Selvino, Bergamo. Italy
Specimen n.907

 

Quartz
Another  piece with matrix. The fat and wide X (2.7x2cm) is  surrounded by calcite malformed and corroded XX, on the dolomite matrix
9x7cm
Selvino, Bergamo. Italy
Specimen n.900


 

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