Mineral Specimens from Chihuahua, Mexico

Bohdanowiczite

#KR61951

Availability: Available
Price: $150.00
Reduced Price: $95.00

Locality: Mun. de Janos, Chihuahua, Mexico
Formula: AgBiSe₂
Size: 1.3 x 0.8 x 1 cm - Thumbnail
Tagged: sulfide, selenium, silver
Special Info: Microprobed

Submicroscopic grains in black sulfide matrix with Sphalerite. One side is sawed and polished for microprobe work. Bohdanowiczite is a fairly rare silver-bismuth selenide.

"Microprobed confirmed" as stated on an old inked label, but I do not have the analytical info.

Bohdanowiczite at WebMineral Bohdanowiczite at MinDat

Calcite

#BC52631

Availability: Available
Price: $250.00

Locality: Santa Eulalia, Chihuahua, Mexico
Formula: CaCO₃
Size: 13 x 10 x 4 cm - Cabinet
Tagged: carbonate

Colorless to slightly yellow, lustrous Calcite crystals to 2.5cm. Nice display specimen.

Calcite at Dakota Matrix Calcite at WebMineral Calcite at MinDat

Calcite

#AH52776

Availability: Available
Price: $975.00

Locality: America mine, Santa Eulalia, Chihuahua, Mexico
Formula: CaCO₃
Size: 17.5 x 16 x 6 cm - Cabinet
Tagged: carbonate
Special Info: Fluorescent

This is a large cabinet specimen purchased by Arnold Hampson in 1972 in Santa Eulalia. There are two very distinct generations of Calcite, which are called "Mariposa" (butterfly) habit. The first generation are scalenohedral crystals measuring 3 to 4cm and are covered by glitterly iron-oxides and/or Siderite. The second generation overgrows the first and are simple yellow rhombic Calcite. The first generation is highly fluorescent red, but is hard to through the oxide coatings. However, flipping the specimen over you will see the intense red patterns of growth under shortwave UV.

It is a beautiful specimen in which the photos do not give justice. The special edition on Santa Eulalia in the Mineralogical Record describes these Calcite crystals and the Mariposa habit including a few photos. On the outer edge are two broken off crystals, which do not detract from the overall appearance. In order to extract these from the wall, it was inevitable.

Calcite at Dakota Matrix Calcite at WebMineral Calcite at MinDat

Calcite

#AH52777

Availability: Available
Price: $850.00

Locality: America mine, Santa Eulalia, Chihuahua, Mexico
Formula: CaCO₃
Size: 16 x 13.5 x 6 cm - Cabinet
Tagged: carbonate

"Mariposa" habit Calcite crystals to 3cm. The Mariposa habit is formed by two generations of Calcite. The first is easily seen since it is coated with a thin veneer of brown iron oxide. The first generation are scalenohedral crystals, and the second is an overgrowth which totally wraps around the first giving an appearance that of a snow-capped mounain range. The very tips of the crystals are sharp as a pin. The Mineralogical Record issue of "Santa Eulalia" describes these clusters. The specimen is in excellent condition and any serious collector of fine Mexican minerals should have one of these in their collection.

Calcite at Dakota Matrix Calcite at WebMineral Calcite at MinDat