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|System:||Monoclinic||Colour:||Colorless to white, very ...|
|Lustre:||Vitreous||Hardness:||4 - 5|
|Name:||Named for Carlo Giuseppe Gismondi (1762-1824), Italian mineralogist, who previously discovered "zeagonite" - a mixture of gismondine and phillipsite.|
"Gismondine-Ba" (proposed) has been found naturally as a secondary slag mineral on lead-rich slags. All other Gismondine is the calcium-rich member, for which "Gismondine-Ca" has been proposed.
Classification of Gismondine
|Nickel-Strunz 10th (pending) edition ID:||9..|
9 : SILICATES (Germanates)
|Dana 7th edition ID:||18.104.22.168|
|Dana 8th edition ID:||22.214.171.124|
77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites
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Type Occurrence of Gismondine
|Type Locality:||Capo di Bove, Rome Province, Latium, Italy|
|Year of Discovery:||1817|
Physical Properties of Gismondine
|Colour:||Colorless to white, very pale pink.|
|Hardness (Mohs):||4 - 5|
Crystallography of Gismondine
|Cell Parameters:||a = 10.24Å, b = 10.61Å, c = 9.84Å|
β = 92.8°
|Ratio:||a:b:c = 0.965 : 1 : 0.927|
|Unit Cell Volume:||V 1,067.80 Å³ (Calculated from Unit Cell)|
Optical Data of Gismondine
|RI values:||nα = 1.536 nβ = 1.539 nγ = 1.542|
|2V:||Measured: 84° , Calculated: 88°|
|Maximum Birefringence:||δ = 0.006|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Dispersion:||r < v strong|
Relationship of Gismondine to other Species
|Member of:||Zeolite Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Dana Grouping):|
Other Names for Gismondine
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Gismondine
American Mineralogist: 48: 664-672.
Bulletin de Mineralogie: 107: 805-812.
Allen, S. et al. (2002): Ion exchange in the synthetic gismondine, zeolite MAP. Phys. Chem. Chem. Phys., 2002, 4, 2409–2415.
Internet Links for Gismondine
|Specimens:||The following Gismondine specimens are currently listed for sale on minfind.com.|
Localities for Gismondine
The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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Locality Updated: Mount Suímo Gemstone Mine, Belas, Sintra, Lisbon District, PortugalFrom Rui Nunes, 20th Dec 2014 16:55:54