Yagiite

Cyclosilicate mineral
(repeating unit)NaMg2(AlMg2Si12)O30IMA symbolYag[1]Crystal systemHexagonal, dipyramidal dihexagonalCrystal class9.CM.05 (Strunz)IdentificationFormula mass1991.71ColorcolourlessCrystal habitInterstitial in a silicate inclusion surrounded by nickel-ironMohs scale hardness5 a 6 (Mohs)LustrevitreousDiaphaneitysemitransparentDensity2.70 g/cm3Pleochroismlow, blue to colourless

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.

Crystal structure and properties

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

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

  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.
  • Yagiite, in mindat.org.
  • Yagiite, in webmineral.com.
  • Yagiite, Handbook of Mineralogy, Mineral Data Publishing.