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Mineralpedia Details for Gismondine

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Gismondine

Gismondine

Formula
Ca2(Si4Al4)O16ยท8H2
Crystal System
Monoclinic 
Crystal Habit
Pseudo Tetragonal, Globular 
Cleavage
Imperfect, None, None 
Luster
Vitreous (Glassy) 
Color
blue white, colorless, gray, white, red 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Conchoidal 
Hardness
4-5 
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Gismondine from Osa quarry, Rome, Latium, Italy

Gismondine
            from Osa quarry, Rome, Latium, Italy

The backside of the label (see prov. tab) states it is the "best I've ever found". I assume was in the words of Erberto Tealdi of Italy, who's name is on the label, and assume it is a nice specimen also. It does indeed have beautiful white crystal aggregates of Gismondine. The smaller white balls are Chabazite. Included in the Gismondine is acicular Ludwigite.

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