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Bournonite from the
Machacamarca mine, Bolivia

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Bournonite (twin) from Viboras Mine, Machacamarca, Machacamarca District (Colavi District), Cornelio Saavedra Province, Potosí Department, Bolivia [./BournBol1009/BournBol100931c.jpg] Bournonite (twin) from Viboras Mine, Machacamarca, Machacamarca District (Colavi District), Cornelio Saavedra Province, Potosí Department, Bolivia [./BournBol1009/BournBol100931b.jpg] Bournonite (twin) from Viboras Mine, Machacamarca, Machacamarca District (Colavi District), Cornelio Saavedra Province, Potosí Department, Bolivia [./BournBol1009/BournBol100931a.jpg]


No. BOURNBOL100931 - $ 95.00 SOLD

Bournonite (twin)

Locality: Viboras Mine, Machacamarca, Machacamarca District (Colavi District), Cornelio Saavedra Province, Potosí Department, Bolivia

Specimen Size: 6.1 x 4.6 x 2.8 cm (small cabinet)
Crystal: 0.8 cm.


This is a nice small cabinet Bournonite specimen that could easily be trimmed down to miniature size to help reduce the discrepancy between the crystal and the matrix. It features a fine quality, twinned, tabular, lustrous, metallic Bournonite crystal on a massive Quartz matrix with minor Pyrite. The crystal itself is good quality, and actually better than most crystals on matrix that I have handled over the years.

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Bournonite (multiple Bournonite (multiple Bournonite (multiple Bournonite (multiple


No. BOURNBOL100932 - $ 750.00

Bournonite (multiple "cogwheel" twins)

Locality: Viboras Mine, Machacamarca, Machacamarca District (Colavi District), Cornelio Saavedra Province, Potosí Department, Bolivia

Specimen Size: 6.4 x 2.8 x 2.3 cm (small cabinet)
Cogwheel crystal group: 2.7 x 2.5 cm.


This is without a doubt one of the most aesthetic and unique Bournonites that I have seen from Bolivia in my life. The piece features several stacked groups of sharp, lustrous, very well-defined "cogwheel"-twinned crystals which are dramatically perched atop a stem of Quartz and Pyrite matrix. The crystals certainly resemble a medieval castle sitting at the top of a hill. One could not ask for a more sculptural and alluring display specimen of Bournonite from any locality, not to mention one that features multiple "cogwheels" ! The display side of the specimen is essentially damage free to top it off.

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Bournonite ( Bournonite (


No. BOURNBOL100933 - $ 450.00

Bournonite ("cogwheel" twins on matrix)

Locality: Viboras Mine, Machacamarca, Machacamarca District (Colavi District), Cornelio Saavedra Province, Potosí Department, Bolivia

Specimen Size: 4.8 x 3.6 x 3.2 cm (miniature)
Cogwheel crystal group: 3.1 x 2.8 cm.


A superb miniature size specimen with wonderful aesthetics. The piece hosts a predominant and salient "cogwheel"-twinned crystal group of Bournonite with superbly defined "cogs", excellent luster and sheer visceral appeal which sits atop a dark Sphalerite matrix with minor Pyrite. To find such a good-sized, and thick "cogwheel" of Bournonite on matrix such as this is nearly unheard of when it comes to Bolivian specimens. Some minor nicks are the only things keeping this piece from being double in price, and the damage does not stand out when weighed against the elegance of the specimen as a whole. Pieces like this are few and far between from this mine.

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Bournonite ( Bournonite ( Bournonite (


No. BOURNBOL100934 - $ 1400.00

Bournonite ("cogwheel" twins on matrix)

Locality: Viboras Mine, Machacamarca, Machacamarca District (Colavi District), Cornelio Saavedra Province, Potosí Department, Bolivia

Specimen Size: 12.8 x 12.2 x 7.8 cm (cabinet)
Crystal group: 8.8 cm.


The sheer AMOUNT of Bournonite on this specimen is more than virtually any other piece of comparable size from this mine. It has some of the largest "cogwheel"-twinned crystals of Bournonite that I have seen on or off matrix from Machacamarca as well. The crystals themselves are broad and impactful with a matte-grey luster and are sitting atop a mound of massive Quartz with associated Pyrite and minor Tetrahedrite. This is a full cabinet size display specimen, which is next to impossible to obtain from this locality, as the majority of pieces are either too damaged or too ugly to be considered by most collectors. Relatively speaking, this piece is very good condition, especially for the size. The few pieces I have seen that are in this size range are typically broken on all sides and terribly unaesthetic. With a custom base, this piece would display very well, and would certainly attract some attention as it resembles the famous "Bancroft Bournonite" from Cornwall (but for a tiny fraction of the price).

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