The crystals are frequently epitaxial overgrowths of "'natrolite "', mesolite, and gonnardite in various orders.
2.
Gonnardite was named in 1896 after Ferdinand Pierre Joseph Gonnard ( 1833 1923 ), who was Professor of Mining Engineering at the University of Lyon, France.
3.
As a hexagonal mineral, quintinite has three axes of equal length at 60 degree angles to one another and a c axis perpendicular to these three axes of a different length . 2H occurs in carbonatite at Jacupiranga, S�o Paulo, Brazil, in the Jacupiranga mine and 3T occurs with minerals like gonnardite and donnayite.
4.
Older papers claim that a complete solid solution exists between tetranatrolite and gonnardite, but tetranatrolite was discredited as a separate species in 1999 . A series, based on the disorder of the silicon-aluminum in the framework, appears to exist between Na-rich gonnardite and natrolite, Na 2 ( Si 3 Al 2 ) O 10 ?H 2 O.
5.
Older papers claim that a complete solid solution exists between tetranatrolite and gonnardite, but tetranatrolite was discredited as a separate species in 1999 . A series, based on the disorder of the silicon-aluminum in the framework, appears to exist between Na-rich gonnardite and natrolite, Na 2 ( Si 3 Al 2 ) O 10 ?H 2 O.
6.
It is generally assumed that it forms at low temperatures, less than 100 �C . It is widespread as a hydrothermal alteration product of ussingite, Na 2 AlSi 3 O 8 ( OH ), associated with gobbinsite, Na 5 ( Si 11 Al 5 ) O 32 ?1H 2 O, gonnardite, ( Na, Ca ) 2 ( Si, Al ) 5 O 10 ?H 2 O, and chabazite-K.
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