Muséum national d'histoire naturelle _ The species

FROM : Jalgaon, Maharashtra, India
SIZE : 14 x 6 x 3.5 cm

This sample is a stalactite of colorless crystals and gem of fluorapophyllite on calcite. Crystals are well-formed and shows striated bright faces. The tallest of these measure 3 cm. The whole sample measures 14 x 6 x 3.5 cm.

This specimen comes from Jalgaon in India and was acquired thanks to support from Total. 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.

SPECIE : Fluorapophyllite

HISTORY : Name given because of its chemical composition; it is the fluorine species of apophyllite

Species first described in 1978 by Pete Dunn (1942-) and Wilson, american mineralogists

Type-locality: unknown

CHEMICAL FORMULA : K Ca4 Si8O20 (F,OH) 8H2O
CRYSTAL SYSTEM : Tetragonal
COLOR : Colorless, white, green, pink, brown, yellow
DIAPHANIETY : Transparent to translucent
LUSTER : Vitreous to pearly
STREAK : White
MORPHOLOGY : Tabular to prismatic crystals
HARDNESS : 4,5-5,0
DENSITY : 2,37

CHEMICAL CLASS : VIII - Silicates
GROUP : Apophyllite
STRUNZ CLASS BEFORE 2001 : 8/H.01-20
STRUNZ CLASS AFTER 2001 : 9.EA.15

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Fluorapophyllite

Fluorapophyllite

MNHN N°195.268

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