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Kosnarite

MNHN N°203.35

visu_59 infos

FROM : Genipapo, Itinga, Minas Gerais, Brazil

general description

The kosnarite crystals are pseudo-octahedral and cream-white coloured with bright facets. The kosnarite is associated with circular pinkish aggregates of zanazziite on a matrix of white albite.

This sample comes from the mineral deposit of Genipapo in Brazil. Acquired thanks to support from Total, it 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.

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Identity card

SPECIE : Kosnarite

HISTORY : Species dedicated to Richard Kosnar (1946-2006), American business and mineral collector

Species first described in 1991 by Brownfield, Foord et al.

Type-locality: Black Mountain, Oxford Co, Maine, USA

CHEMICAL FORMULA : K Zr2 (PO4)3
CRYSTAL SYSTEM : Hexagonal
COLOR : Blue, pale blue, light green, colorless
DIAPHANIETY : Transparent to translucent
LUSTER : Vitreous
STREAK : White
MORPHOLOGY : Rhomboedric crystals, pseudo-cubic
HARDNESS : 4,5
DENSITY : 3,206

CHEMICAL CLASS : VII - Phosphates, arsenat
GROUP : Kosnarite
STRUNZ CLASS BEFORE 2001 : 7/A.17-10
STRUNZ CLASS AFTER 2001 : 8.AC.60

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