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Wulfïenite

Wulfenite

MNHN N°175.276

visu_509 infos

FROM : Los Lamentos, Chihuahua, Mexico
SIZE : 6 x 5.5 cm crystal: 1.2 x 1 x 0.15 cm

general description

This specimen is a group of wulfenite crystals in a microcrystalline matrix of white calcite. The wulfenite crystals are rectangular and very flat. Their orange colour is uniform and their facets are bright. This aspect gives a toffee shape like to the crystals.

The sample comes from Los Lamentos in the Chihuahua area in Mexico, it measures 6 x 5.5 cm. It has been given by Professor Henri-Jean Schubnel, who acquired this sample during a scientific mission in USA in 1975.

This specimen is today kept in the storage rooms of the collections of the Museum national d’Histoire naturelle (i.e., not yet displayed to the public).

Photography: Louis-Dominique Bayle, © MNHN.

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The Species page

Identity card

SPECIE : Wulfïenite

HISTORY : Species dedicated to Frantz Xaver von Wulfen (1728-1805), Austrian mineralogist

Species described in 1845 by Wilhelm Karl Ritter von Haidinger (1795-1871), Austrian geologist

Type-locality: Bleiberg, Carinthia, Austria

CHEMICAL FORMULA : Pb MoO4
CRYSTAL SYSTEM : Tetragonal
COLOR : Yellow-orange, light orange, red-orange, gray
DIAPHANIETY : Transparent to opaque
LUSTER : Resinous, sub-adamantine
STREAK : White
MORPHOLOGY : Crystals with square section; flattened, tabular
HARDNESS : 2,75-3,0
DENSITY : 6,88-7,48

CHEMICAL CLASS : VII - Sulfates, chromates
GROUP : Scheelite
STRUNZ CLASS BEFORE 2001 : 6/G.01-30
STRUNZ CLASS AFTER 2001 : 7.GA.05

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