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Gormanite

MNHN N°204.42

visu_80 infos

FROM : Lavra Gormanita, Linopolis, Minas Gerais, Brazil

general description

This sample shows a fribous bouquet of bluish-green gormanite on white albite. One observes small brown crystals of siderite. Crystals of gormanite measure on the average 10 mm.

This specimen comes from Lavra Gormanita mineral deposit in Minas Gerais in Brazil. The support from Total enables the acquisition of this specimen. It is 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.

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The Species page

Identity card

SPECIE : Gormanite

HISTORY : Species dedicated to Donald Herbert Gorman (1922- ), professeur of mineralogy, University of Toronto, Canada

Species first described in 1981 by B. Darko Sturman et al.

Type-locality: Big Fish River and Blow River, Yukon, Canada

CHEMICAL FORMULA : Fe3 Al4(PO4)4(OH)6 2H2O
CRYSTAL SYSTEM : Triclinic
COLOR : Blue-green
DIAPHANIETY : Semi-transparent
LUSTER : Vitreous
STREAK : Light green
HARDNESS : 4,0-5,0
DENSITY : 3,10-3,12

CHEMICAL CLASS : VII - Phosphates, arsenat
GROUP : Souzalite
STRUNZ CLASS BEFORE 2001 : 7/D.11-100
STRUNZ CLASS AFTER 2001 : 8.DC.45

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