Yagiite is a cyclosilicate mineral belonging to the osumilite group. It was discovered in 1968 in the iron meteorite that fell in Colomera in the province of Granada (Spain). Named after the Japanese mineralogist Kenzo Yagi, its CAS Registry Number is IMA1968-020.

Yagiite
General
Categorycyclosilicates
Formula
(repeating unit)
NaMg2(AlMg2Si12)O30
IMA symbolYag[1]
Crystal systemHexagonal, dipyramidal dihexagonal
Crystal class9.CM.05 (Strunz)
Identification
Formula mass1991.71
Colorcolourless
Crystal habitInterstitial in a silicate inclusion surrounded by nickel-iron
Mohs scale hardness5 a 6 (Mohs)
Lustrevitreous
Diaphaneitysemitransparent
Density2.70 g/cm3
Pleochroismlow, blue to colourless

Crystal structure and properties

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It is an anhydrous aluminosilicate of sodium and magnesium, which crystallizes in the hexagonal crystalline system with silicate tetrahedra arranged in double rings.[2] In addition to the elements of its formula, it usually carries impurities: such as titanium, chromium, iron, manganese and calcium.

Locations

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Found only as an inclusion of silicate inside the iron meteorite of Colomera (Spain),[3] in which yagiite has crystallized in an environment rich in magnesium and associated with other minerals such as diopside, whitlockite, tridymite, plagioclase of the type albite-anorthite, as well as iron-nickel alloys.[4][2]

References

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  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ a b Bunch, Theodore E.; Fuchs, Louis H. (1969). "Yagiite, a new sodium-magnesium analogue of osumilite". American Mineralogist. 54 (1–2): 14–18. ISSN 0003-004X.
  3. ^ Bunch, T. E.; Keil, Klaus; Olsen, E. (1970). "Mineralogy and petrology of silicate inclusions in iron meteorites". Contributions to Mineralogy and Petrology. 25 (4): 297–340. Bibcode:1970CoMP...25..297B. doi:10.1007/BF00399290. ISSN 1432-0967. S2CID 140686800.
  4. ^ "Meteoritical Bulletin: Entry for Colomera". www.lpi.usra.edu. Retrieved 2019-12-27.
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  • Yagiite, in mindat.org.
  • Yagiite, in webmineral.com.
  • Yagiite, Handbook of Mineralogy, Mineral Data Publishing.