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sapphirine
The Probable Metapelite Nature of Sapphirine–Spinel and Garnet Gedritites of the Aulandzha Block of the Omolon Massif
The sapphirine-bearing rocks in contact with the Lherz peridotite body: New mineralogical data, age and interpretation
Extreme thermal metamorphism associated with Gondwana assembly: Evidence from sapphirine-bearing granulites of Rajapalayam, southern India
Khesinite, Ca 4 Mg 2 Fe 3+ 10 O 4 [(Fe 3+ 10 Si 2 )O 36 ], a new rhönite-group (sapphirine supergroup) mineral from the Negev Desert, Israel – natural analogue of the SFCA phase
Kuratite, Ca 4 (F Ti 2 )O 4 [Si 8 Al 4 O 36 ], the Fe 2+ -analogue of rhönite, a new mineral from the D'Orbigny angrite meteorite
Reaction textures and metamorphic evolution of sapphirine–spinel-bearing and associated granulites from Diguva Sonaba, Eastern Ghats Mobile Belt, India
Ab initio thermodynamic and thermophysical properties of sapphirine end-members in the join Mg 4 Al 8 Si 2 O 20 -Mg 3 Al 10 SiO 20
ORTHOPYROXENE + SILLIMANITE PREDATING SAPPHIRINE + QUARTZ: A RARE CASE OF ULTRAHIGH-TEMPERATURE METAMORPHISM FROM THE CENTRAL ZONE, LIMPOPO COMPLEX, SOUTH AFRICA
Igneous sapphirine as a product of melt-peridotite interactions in the Finero Phlogopite-Peridotite Massif, Western Italian Alps
The genesis of mantle-derived sapphirine
Different origins of Thai area sapphire and ruby, derived from mineral inclusions and co-existing minerals
We report new petrological data for granulites from the Central Zone of the Limpopo Complex, southern Africa, and construct a prograde P-T path that traverses from high-pressure granulite-facies metamorphism to peak ultrahigh-temperature (UHT) metamorphism by rapid decompression, which was followed by further decompression and cooling. Mg-rich ( X Mg ~0.58) staurolite enclosed within poikiloblastic garnet in an Mg-Al-rich rock from the Beit Bridge area is rarely mantled by a sapphirine + quartz corona, suggesting the progress of the prograde dehydration reaction: staurolite + garnet → sapphirine + quartz + H 2 O. The symplectic sapphirine + quartz developed around staurolite probably implies decompression from P >14 kbar toward the stability of sapphirine + quartz at T ~1000 °C along a clockwise P-T path. The orthopyroxene + sillimanite + quartz assemblage mantled by cordierite aggregates in a pelitic granulite from the same area also suggests extreme metamorphism and subsequent further decompression. Various corona textures such as kyanite + sapphirine, sapphirine + cordierite, and orthopyroxene + cordierite were probably formed as a result of decompression cooling events. The prograde high-pressure metamorphism and the following UHT event relate to the collisional tectonics of the Zimbabwe and Kaapvaal Cratons, which are associated with the amalgamation of microcontinents during the Neoarchean.