Specimen #1952

Name: Calcite with Dolomite and Chalcopyrite

Type: Mineral

Locality: Sweet Water Mine, Viburnum Trend, Reynolds County, Missouri, USA

Favorite? N

Fluorescent? N

Size: 18 x 13 x 10 cm

Weight: 1260

Acquired: 2010-04-20

Source: Trinity: Giorgio Spiga

Label: N

Comment: A very old, specimen from the Luciano Floris collection, acquired during the 1971 Ivrea mineral show. It consists in a black ore matrix, completely covered by a layer of millimetric Dolomite and chalcopyrite crystals, supporting a lot of undamaged Calcite crystals including a remarkable 5x1.5x1 cm doubly terminated one . The calcite crystals are translucent with transparent or semitransparent tips, the natural colour is a grey with a yellowish hue. Under mid and long and mid wave length UV light they show a strong purple fluorescence while the dolomite shows a medium intensity white fluorescence. This time I can show a good UV pic, obtained using a 312 nm source. Thanks to the very efficient UV filter built in inside my new Nikon D700 camera, the reflected UV radiation has been cut off, the colours I see in my display are not exactly the same I see with my eyes but they are not significantly different and photoshop correction is no more neccessary.

Minerals: Calcite (CaCO₃) Chalcopyrite (CuFeS₂) Dolomite (CaMg(CO₃)₂)

There are 2 pictures on file

M01952-01.jpg:

Calcite with Dolomite and Chalcopyrite, Sweet Water Mine, Viburnum Trend, Reynolds County, Missouri - 18 x 13 x 10 cm

M01952-02.jpg:

Calcite with Dolomite and Chalcopyrite, Sweet Water Mine, Viburnum Trend, Reynolds County, Missouri