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Wulfïenite

Wulfenite

MNHN N°169.50

visu_510 infos
FROM : Los Lamentos, Chihuahua, Mexico
SIZE : 10.5 x 8.5 cm crystal: 1.3 x 0.9 x 0.7 cm

general description

This sample has wulfenite crystals gathered together on a microcrystalline matrix of white calcite. The wulfenite crystals are rectangular and are centimetric. Their colour is orange and their facets are bright. This aspect reminds toffees.

The sample comes from Los Lamentos in the Chihuahua area in Mexico, it measures 10.5 x 8.5 cm. It has been acquired after a mineral merchant in 1969.

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

Photography: Louis-Dominique Bayle, © MNHN
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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