(Rio Grande de Sol, Brazil) is one of the microporous, aluminosilicate minerals known as zeolites, commonly used as commercial absorbents and catalysts--including producing medical oxygen.
Wise, Thermodynamic studies of zeolites: Natrolite, Msolite, and Scolecite
, American Mineralogist.
They were followed by acicular-fibrous zeolites such as natrolite/ gonnardite, thomsonite, mesolite and scolecite
Analcime is usually a Na-rich mineral phase, but may sometimes contain appreciable K (Utada, 1970).
epistilbite, barrerite, scolecite
, chabazite, "heulandite", wairakite, tetranatrolite and laumontite.
A number of other zeolites have also been reported from Merelani, including laumontite and mesolite in tufts of acicular white crystals, and stilbite, scolecite
Powellite on Scolecite
Nasik, India 6" wide (Powellite crystal 3" tall) ex-collection Joseph Freilich
Numerous dealers at this show, as at nearly all major shows these days, had superb specimens of (oh, let's see) Veracruz, Mexico amethyst; Moroccan vanadinite and cerussite; Pikes Peak, Colorado microcline (and even topaz); apophyllite, stilbite, calcite, scolecite
Yet even these great mesolite specimens are exceeded in size by several of the 100 scolecite
specimens taken in January 2008 from a quarry near Junnar village.
, mesolite, cerussite--such specimens and other fragile delicacies are highly desired by avid mineral collectors.
The powellite crystals are loose, complete floaters, with white sprigs of scolecite
protruding a millimeter or so here and there, and they are razor-sharp, textbook examples of tetragonal bipyramids, with c axes about 1.
has been identified by petrographic means from locality 19 (Donald Hogarth, personal communication, 1993).
First, there are not-beautiful but very unusual specimens, found very recently in a well-digging near Aurangabad, of what some dealers at Denver were tentatively calling a mixture of scolecite
and mesolite, but which has now been shown to be the zeolite species thomsonite.