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Indialite in xenolithic rocks from Somma-Vesuvius volcano (Southern Italy): Crystal chemistry and petrogenetic features
-
Giuseppina Balassone
,
Enrico Franco
Published/Copyright:
March 28, 2015
Abstract
The rare mineral indialite, a hexagonal high-temperature form of cordierite, has been discovered for the first time in Italy at Somma-Vesuvius volcano in unusual pyrometamorphic ejecta. The indialitebearing xenoliths are composed of several pale yellow fragments consisting of very fine-grained indialite with traces of cristobalite. On the surface of the fragments, colorless indialite and pale-blue, prismatic osumilite crystals form whitish crusts, with subordinate phlogopite and trace amounts of corundum. Gypsum and Fe-oaxides are ubiquitous. Chemical composition of the Italian indialite is characterized by high XMg (~0.95) and significant K2O (~1.4 wt%). Single-crystal X-ray diffraction measurements give cell dimensions very similar to those of the indialite from the Bokaro coalfield. The diffraction pattern shows no significant deviation from the symmetry conditions of the space group P6/mcc, which is the space group generally accepted for high-cordierite. The presence of guest K (and lesser Ca) in the sixfold channel does not produce appreciable distortions in the framework of T2 tetrahedra, probably because of the weak interactions between guest and the ring O2 atoms. Indialite-bearing rocks originated through a pyrometamorphic process at shallow depth and at maximum temperature close to ~1200 °C. Rapid crystallization and subsequent quenching favored a higher symmetry, thus “freezing” the space group P6/mcc.
Received: 2003-1-15
Accepted: 2003-7-20
Published Online: 2015-3-28
Published in Print: 2004-1-1
© 2015 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
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- Coexisting chromian omphacite and diopside in tremolite schist from the Chugoku Mountains, SW Japan: The effect of Cr on the omphacite-diopside immiscibility gap
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- A kinetic study of the exsolution of pentlandite (Ni,Fe)9S8from the monosulfide solid solution (Fe,Ni)S
- Single-crystal plagioclase feldspar dissolution rates measured by vertical scanning interferometry
- A simple empirical method for high-quality electron microprobe analysis of fluorine at trace levels in Fe-bearing minerals and glasses
- Constraints on mingling of crystal populations from off-center zoning profiles: A statistical approach
- Pyribole evolution during tremolite synthesis from oxides
- Solution calorimetric determination of the enthalpies of formation of NH4-bearing minerals buddingtonite and tobelite
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