Mineral Factbook

Gismondine-Ca

Ca2(Si4Al4)O16·8H2OIMA symbol: Gis-Carenamed

Gismondine-Ca is a silicate mineral with the formula Ca2(Si4Al4)O16·8H2O, crystallizing in the monoclinic system. It has a Mohs hardness of 4-5, typically white, gray or red in color, with a vitreous luster, a specific gravity of 2.265.

Photos

Gismondine-Ca specimen photo
Shannon Heinle · CC0 · Commons
Gismondine-Ca specimen photo
Kelly Nash · CC BY 3.0 · Commons
Gismondine-Ca specimen photo
Mineralvarado · CC BY-SA 3.0 · Commons

Physical properties

Hardness (Mohs)
4-5single sourceDana, System of Mineralogy, 6th ed. (1892)
Specific gravity
2.265 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892)
Color
gray, red, whitesingle sourceDana, System of Mineralogy, 6th ed. (1892)
Luster
vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892)

Chemistry (calculated)

Molecular weight700.54 g/molcalculated from the IMA formula
Composition (wt%)Ca 11.44%, Si 16.04%, Al 15.41%, O 54.81%, H 2.3%

Classification

Nickel-Strunz (10th)9.GC.05Wikidata (CC0)
Nickel-Strunz (9th)9.GC.05Wikidata (CC0)