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Hydrous gem magnesian cordierite with inclusions of hydroxyapatite, dolomite, and rutile

Published online by Cambridge University Press:  05 July 2018

Giorgio Graziani  and
Gioli Guidi
Giorgio Graziani
Affiliation:
Istituto di Mineralogia e Petrografia, Università degli Studi, 00100 Roma, Italy
Gioli Guidi
Affiliation:
Istituto di Mineralogia e Petrografia, Università degli Studi, 00100 Roma, Italy
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Summary

An uncommon sample of a pale-blue Madagascar cordierite and its mineral inclusions of different kinds have been studied. The physical properties of the embedding cordierite are: α = 1·528, β = 1·522, γ = 1·537, δ = 0·009, 2Vα = 96°, density = 2·534 g/cm3, a = 17·082 Å, b = 9·728, c = 9·352, Δ = 0·26. The electron probe analysis gave SiO2=48·64%, Al2O3 = 35·08, FeO = 0·70, MgO = 12·35, H2O+ = 2·50. This is therefore a hydrous magnesian cordierite. Its structural state is related to the shift in α, β, γ, 2Vα, and Δ with heating. Probe analyses were performed on the inclusions: hydro-xyapatite, dolomite, and rutile. The occurrence of dolomite suggests the conditions of formation of the host mineral.

Type
Research Article
Information
Mineralogical Magazine , Volume 42 , Issue 324 , December 1978 , pp. 481 - 485
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1978

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