in the asemi-gawa area of intermediate high-pressure and low-temperature sanbagawa metamorphic belt in central shikoku, japan, piemontite-quartz schists are common in which cation exchange between piemontite and garnet has been studied. piemontite in contact with garnet usually contains two zones in which core is enriched in mn3+ and surrounded by a rim rich in fe3+. garnet is ca-fe-bearing spe...

Sector-zoned aegirine was found in a specimen of Sanbagawa quartz schist from the Iimori region of the western Kii Peninsula, central Japan. The schist consists of quartz, aegirine, albite, amphibole (magnesioriebeckite to manganocummingtonite), garnet (spessartine), rhodochrosite, pyrophanite, jacobsite, and apatite. Aegirine occurs as subhedral to euhedral prismatic crystals less than 250 μm ...

The equation of state (EoS) a natural almandine74spessartine13pyrope10grossular3 garnet typical composition found in metamorphic rocks Earth’s crust was obtained using single crystal synchrotron X-ray diffraction under isothermal room temperature compression. A third-order Birch-Murnaghan EoS fitted to P-V data and the results are compared with published for iron, manganese, magnesium, calcium ...

This paper is the fourth in a series relating the lattice vibrational properties to the thermodynamic properties of minerals. The temperature dependence of the harmonic lattice heat capacity is calculated from a model which uses only elastic, crystallographic, and spectroscopic data for the following minerals: calcite, zircon, forsterite, grossular, pyrope, almandine, spessartine, andradite, ky...