Mineralpedia Details for Gismondine
Gismondine
- Formula
- Ca2(Si4Al4)O16ยท8H2O
- 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
- WebMineral
- View Gismondine
- Mindat
- View Gismondine
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.
Click thumbnail images for larger view.
