Rosell Minerales

This quartz specimen shows an aesthetic group with an excellent transparence and are very well defined faces and edges. It is not common to find with this configuration and less from this Colombian mine.

Size: 4.7 x 4.2 x 2 cm.
Main crystal: 5.3 cm.
Found in 2018.

This group of hyaline quartz crystals belongs from the Cabiche mine, very sharp, with exceptional transparency and luster. They show parallel and at the same time crossed growths. Quartz specimens from this Colombian mine, located in the Boyacá emerald mining area, have been well known since the end of the last century.

Size: 6.6 x 4.7 x 3.1 cm.
Main crystal: 6 cm.
Found in 2018.

Quartz specimens from this Colombian mine, located in the Boyacá emerald mining area, have been well known since the end of the last century. By 2017, new galleries were opened those located different geodes. These crystals, called "mango quartz" or "crown quartz" were found in them, with inclusions that, after being recently analyzed, were determined as halloysite. The inclusions show filamentous structures and the tips of the crystals turn to orange tones. On our website we have already sold some samples with these inclusions on sale, without the orange coloration. Really aesthetic and on a matrix with goethitized dolomite-siderite.

Size: 5 x 4 x 2.6 cm.
Main crystal: 4.2 cm.
Found in 2018.

Quartz specimens from this Colombian mine, located in the Boyacá emerald mining area, have been well known since the end of the last century. By 2017, new galleries were opened those located different geodes. These crystals, called "mango quartz" or "crown quartz" were found in them, with inclusions that, after being recently analyzed, were determined as halloysite. The inclusions show filamentous structures and the tips of the crystals turn to orange tones. On our website we have already sold some samples with these inclusions on sale, without the orange coloration. Really aesthetic and on a matrix with goethitized dolomite-siderite.

Size: 7.7 x 5.5 x 4.7 cm.
Main crystal: 3.8 cm.
Found in 2018.

Quartz specimens from this Colombian mine, located in the Boyacá emerald mining area, have been well known since the end of the last century. By 2017, new galleries were opened those located different geodes. These crystals, called "mango quartz" or "crown quartz" were found in them, with inclusions that, after being recently analyzed, were determined as halloysite. The inclusions show filamentous structures and the tips of the crystals turn to orange tones. On our website we have already sold some samples with these inclusions on sale, without the orange coloration. Really aesthetic and on a matrix with goethitized dolomite-siderite.

Size: 7 x 6 x 5 cm.
Main crystal: 6.6 cm.
Found in 2018.

Quartz specimens from this Colombian mine, located in the Boyacá emerald mining area, have been well known since the end of the last century. By 2017, new galleries were opened those located different geodes. These crystals, called "mango quartz" or "crown quartz" were found in them, with inclusions that, after being recently analyzed, were determined as halloysite. The inclusions show filamentous structures and the tips of the crystals turn to orange tones. On our website we have already sold some samples with these inclusions on sale, without the orange coloration. Really aesthetic and on a matrix with goethitized dolomite-siderite.

Size: 7.4 x 7.4 x 3.9 cm.
Main crystal: 6.4 cm.
Found in 2018.

Quartz specimens from this Colombian mine, located in the Boyacá emerald mining area, have been well known since the end of the last century. By 2017, new galleries were opened those located different geodes. These crystals, called "mango quartz" or "crown quartz" were found in them, with inclusions that, after being recently analyzed, were determined as halloysite. The inclusions show filamentous structures and the tips of the crystals turn to orange tones. On our website we have already sold some samples with these inclusions on sale, without the orange coloration. Really aesthetic and on a matrix with goethitized dolomite-siderite.

Size: 8.2 x 7.7 x 4.5 cm.
Main crystal: 5.5 cm.
Found in 2018.

Quartz specimens from this Colombian mine, located in the Boyacá emerald mining area, have been well known since the end of the last century. By 2017, new galleries were opened those located different geodes. These crystals, called "mango quartz" or "crown quartz" were found in them, with inclusions that, after being recently analyzed, were determined as halloysite. The inclusions show filamentous structures and the tips of the crystals turn to orange tones. On our website we have already sold some samples with these inclusions on sale, without the orange coloration. Really aesthetic and on a matrix with goethitized dolomite-siderite.

Size: 8.9 x 7.6 x 6.5 cm.
Main crystal: 4.5 cm.
Found in 2018.

Large group of prismatic quartz crystals showing well developed prism with brilliance and excellent transparency. Some of them have unknown filamentous inclusions those give further mineralogical interest to this specimen. From a known mining area, but these specimens are not well represented in collections.

 

Size: 8.3 x 5.5 x 5.5 cm.
Main crystal: 30 x 4 mm.
Found in ca. 2009.

A very sharp emerald crystal "trapped" between calcite crystals. The color, transparence and brilliance of these crystal are more than excellent. It shows a very defined prism, with a perfect top pinacoidal face and hints faces of the dipyramid, observed between the prism and the pinacoid. Some interesting color zoning can be observed in its lower part. A true gemmy miniature.

Size: 3,5 x 3,0 x 3,0 cm.
Main crystal: 11 x 5 mm.

A gemmy emerald crystal with an intense color, disposed very aerial on a matrix with calcite and small crystals of the same mineral. It shows a developed prism, with curious growths on faces, and a terminal pinacoid showing natural corrosion forms and a small dent, which does not affect its aesthetics. Good transparence and brilliance. Good choice with an excellent price.

Size: 4,5 x 4,5 x 2,4 cm.
Main crystal: 11 x 7 mm.

A very rich group of quartz crystals, some of them doubly terminated, with well defined faces and edges. Interesting elongated prism and terminal faces. We would like to emphisize the delicate filamentous inclusions that can be seen inside through transparency.
These inclusions are of unknown composition, but probably due to fluid inclusions originated during the crystal growth. They are accompanied by curious hemispherical aggregates of goethite-limonite, with a intense orange color, formed after the quartz crystals. From a known mining area, but these specimens are not well represented in collections.

Size: 8,2 x 7,2 x 5,5 cm.
Main crystal: 38 x 9 mm.
Found in 2009