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RM132   Galena with Sphalerite

Rhodope Mts., Madan, Smolyan Oblast, Bulgaria

Group of Galena crystals from an old mine in the area of Madan. This specimen shows well-developed cubic forms in staggered growth with defined edges and complex growths on faces. Its metallic luster has the original brightness of these original specimens and we decided to preserve. We would like to emphisize a group of very bright sphalerite crystals of intense honey color, near to black, showing tetrahedral forms and truncated  on vertices.

This is a sample of the first specimens collected from the area of Madan and belonged to a miner collection, with no more data.


Size: 9.7 x 6.5 x 5.8 cm.
Main crystal: 2.7 x 2.5 cm.
Found in ca 1970

 

RM127   Carbonate-cyanotrichite with Fluorite and Malachite

Quinglong (Dachang), Sb-Au deposit, Qianxi'nan, Guizhou, China

Thin needle like Carbonate-cyanotrichite crystals disposed as a velvet layer and as radial aggregates on a matrix with cubic colorless Fluorite crystals. These aggregates show a intense blue sky color, deep in the core.


Size: 4.5 x 4.0 x 3.7 cm
Main crystal: 3 mm (aggr)
Found in 2009

 

RM126   Carbonate-cyanotrichite with Fluorite

Quinglong (Dachang), Sb-Au deposit, Qianxi'nan, Guizhou, China

Thin needle like Carbonate-cyanotrichite crystals disposed as radial aggregates on a matrix partially covered by cubic colorless Fluorite crystals. These aggregates show a intense blue sky color, deep in the core. Really good specimen.


Size: 6,5 x 4,0 x 3,5 cm
Main crystal: 3 mm (aggr)
Found in 2009

 

RM131   Chalcostibite with Tetrahedrite, Quartz and Dolomite

Boldut Mine, Cavnic, Maramures, Romania

Group of small, shiny, gray metallic blades of flattened Chalcostibite crystals, some of them very aerial disposed. Accompanied by brilliant Tetrahedrite and Quartz. Chalcostibite was uncommon at Cavnic mine till 90's finding.


Size: 8.5 x 6.7 x 4.1 cm
Main crystal: 3 x 1 mm

 

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
 

RM125   Topaz with Quartz

Brumado (Bom Jesus dos Meiras), Bahía, Brazil

Three prismatic Topaz crystals with well defined faces and edges, very transparent and showing a delicate and uniform pinkish tone. Very fluorescent. Implanted on a Quartz crystal matrix.


Size: 5,0 x 3,6 x 2,4 cm.
Main crystal: 5 x 4 mm (group)
Found in 11/2008

Fluorescent under long wave UV
 

RM121   Marcasite (Sperkise twin)

Canyada de Berig, Teruel, Aragón, Spain

A very rich marcasite specimen covered by a layer of small but very sharp and brilliant crystals, with metallic reflections between gold and greenish tones, with iridescence.

These marcasite crystals show tabular forms and the Sperkise twin (from the German SpeerkiesSpeer: spear and Kies: rock-. It has been used as a synonym for marcasite specimens). This twin is characterized by being formed by 4 or 5 crystals cyclically disposed around a central axis parallel to c.


Size: 4,2 x 5,5 x 9,3 cm
Main crystal: 1,5 x 1,5 mm
Found in 02/2011

 
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