Sanidine
Query URLs
https://term.museum-digital.de/md-de/tag/10686
- Note
- Sanidine is the high temperature form of potassium feldspar with a general formula K(AlSi3O8). Sanidine is found most typically in felsic volcanic rocks such as obsidian, rhyolite and trachyte. Sanidine crystallizes in the monoclinic crystal system. Orthoclase is a monoclinic polymorph stable at lower temperatures. At yet lower temperatures, microcline, a triclinic polymorph of potassium feldspar, is stable.
Due to the high temperature and rapid quenching, sanidine can contain more sodium in its structure than the two polymorphs that equilibrated at lower temperatures. Sanidine and high albite constitute a solid solution series with intermediate compositions termed anorthoclase. Exsolution of an albite phase does occur; resulting cryptoperthite can best be observed in electron microprobe images.
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Sanidin
Sanidin
Object information
Image: Naturhistorisches Museum Mainz / Landessammlung für Naturkunde Rheinland-Pfalz - CC BY-NC-SA -
Sanidin (geschliffen)
Sanidin (geschliffen)
Object information
Image: Naturhistorisches Museum Mainz / Landessammlung für Naturkunde Rheinland-Pfalz - CC BY-NC-SA -
Sanidin
Sanidin
Object information
Image: Naturhistorisches Museum Mainz / Landessammlung für Naturkunde Rheinland-Pfalz - CC BY-NC-SA -
Sanidin
Mai neve: szanidin, Lelőhely:...
Object information
Image: Viski Károly Múzeum Kalocsa - RR-F -
Sanidin (Kalifeldspat)
Sanidin entwickelt meist...
Object information
Image: Werra-Kalibergbau-Museum, Heringen/W. - CC BY-NC-SA
References
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