GISMONDINE-Ca - Dobrná near Děčín, Czech Republic | 29 x 23 x 22 mm | Box & Label | RARE
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Eva & David Kalat
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Mineral: GISMONDINE-Ca
Locality: Dobrná, Děčín District, Ústí nad Labem Region, Czech Republic
Dimension (mm): 29 x 23 x 22 mm
Specimen packed in box of size 38 x 38 x 34 mm with card/label.
Description / Notes: Gismondin forms in the cavities of basalts colorless, whitish, vitreous, translucent, dipyramidal crystals that are up to 2 mm in size.
- Formula:CaAl2Si2O8 · 4H2O
- Colour:Colorless, white, grayish, bluish white, reddish
- Lustre:Vitreous
- Hardness:4½
- Specific Gravity:2.20 - 2.26
- Crystal System:Monoclinic
- Member of:Gismondine Subgroup > Zeolite Group
- Name:Named gismondine in 1817 for Carlo Giuseppe Gismondi (1762-1824), Italian mineralogist, who previously discovered "zeagonite" - a mixture of gismondine and phillipsite. The suffix was added by the IMA in 2021, after the discovery of gismondine-Sr. The suffix/modifier follows the naming convention for zeolites and denotes the dominant extra-framework cation.
- Type Locality:Capo di Bove, Rome, Metropolitan City of Rome Capital, Lazio, Italy
- IMA Status: Valid Species (Pre-IMA) 1817
Further information in mineralogy databases:
- 9.Silicates
- Gismondine-Ca
We automatically include to every Moldavite-Tektite-Meteorite item our company authenticity card/label (Certificate of Authenticity) with our IMCA International Meteorite Collectors Association (ID #2082) and owner signature.You can check our profile here
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