Rosell Minerales

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RM300   Silver

Estaño Orcko mine, Colavi, Machacamarca, Cornelio Saavedra, Potosí, Bolivia

Specimen of a little-known locality. These sample shows aggregates of silver crystals, with an intense luster and tones between white and golden. They are disposed on a matrix with quartz and iron oxides with which they contrast.

Size: 6.4 x 4.8 x 2 cm.
Main crystal: 8 mm.
Found in 08/2011


RM1270   Japan law quartz twin with cassiterite

Siglo XX mine, Llallagua, Rafael Bustillo, Potosí, Bolivia

The Siglo XX mine is one of the most impressive Bolivian mining localities. It produces some amazing specimens of common species like quartz, few of the with the Japan-Law twin which are are well known in the mineral world. In this sample we can enjoy a good sized Japan-twin quartz crystals, with transparence and luster. This nice twin is disposed on a druse of hyaline quartz crystals.
To give a unique touch to the specimen a group of cassiterite crystals with good brilliance and deep black color, very rich in faces, interpenetrating between them and with some quartz crystals. A superb specimen.

Size: 11.0 x 6.8 x 6.3 cm.
Main crystal: 25 x 15 mm. (macla/twin)


RM1036   Magnetite

San Calixto prospect, Cerro Huañaquino, Potosí, Bolivia

Rich group of octahedral magnetite crystals with a good size. Brilliant, intense gray metallic tone and disposed very aesthetically on the rocky matrix. A classic that is hard to see on the market.

Size: 12.0 x 10.4 x 4.5 cm.
Main crystal: 13 x 12 mm.
Found in 2002.

Ex-col. Joan Rosell.
Magnetic properties: It is attracted by magnets


RM634   Vivianite

Canutillos Mine, Veta (vein) Tomokoni, Colavi, Cornelio Saavedra, Potosí, Bolivia

Perfection! A nice crystal of vivianite, with a deep green color and well defined. With transparence that show the green tone characteristic for the species. Very aerial disposed on a solid sandstone matrix, sulfur free which ensures the stability of the specimen in the future. It is better in live than on the photo, but enjoy them. An exceptional specimen.

Size: 6,9 x 6,5 x 4,5 cm.
Main crystal: 38 x 20 mm.

Precio reducido-Reduced price 310€

RM129   Sigloite pseudomorph after Paravauxite

Mina Siglo XX, Llallagua, Rafael Bustillo, Potosí, Bolivia

Group of Sigloite crystals pseudomorph after Paravauxite, partially covering the rocky matrix. Paravauxite and sigloite differ chemically by the presence of a single water molecule. Sigloite is white to yellowish. The Siglo XX Mine is the type locality for Sigloite species.

Size: 5.5 x 3.5 x 2.5 cm
Main crystal: 9 x 2 mm

Fluorescent under long wave UV