Chlormayenite

Chlormayenite
Chlormayenite
	Crystal structure of chlormayenite (Cl− ions are omitted for clarity)[1]
General
Category	Oxide mineral ; Mayenite supergroup
Formula; (repeating unit)	Ca12Al14O32[☐4Cl2]
IMA symbol	Cmy[2]
Strunz classification	4.CC.20
Crystal system	Cubic
Crystal class	Hextetrahedral (43m) ; H-M symbol: (4 3m)
Space group	I43d
Unit cell	a = 11.98 Å; Z = 2
Identification
Color	Colorless
Crystal habit	Microscopic anhedral grains
Streak	White
Diaphaneity	Transparent
Specific gravity	2.85
Optical properties	Isotropic
Refractive index	1.614–1.643
Alters to	Absorbs water on exposure
References	[3][4][5]

Chlormayenite (after Mayen, Germany), Ca₁₂Al₁₄O₃₂[☐₄Cl₂], is a rare calcium aluminium oxide mineral of cubic symmetry.

It was originally reported from Eifel volcanic complex (Germany) in 1964. It is also found at pyrometamorphic sites such as in the Hatrurim Formation of Israel and in some burned coal dumps.[6][3]

It occurs in thermally altered limestone xenoliths within basalts in Mayen, Germany and Klöch, Styria, Austria. In the Hatrurim of Israel it occurs in thermally altered limestones. It occurs with calcite, ettringite, wollastonite, larnite, brownmillerite, gehlenite, diopside, pyrrhotite, grossular, spinel, afwillite, jennite, portlandite, jasmundite, melilite, kalsilite and corundum in the limestone xenoliths. In the Hatrurim it occurs with spurrite, larnite, grossite and brownmillerite.[3]

Synthetic Ca₁₂Al₁₄O₃₃ and Ca₁₂Al₁₄O₃₂(OH)₂ are known, they are stabilized by moisture instead of chlorine.[4][7] The formula can be written as [Ca₁₂Al₁₄O₃₂]O,[8] which refers to the unique feature: anion diffusion process.[9]

Chlormayenite is also found as calcium aluminate in cement where its formula is also written as 11CaO·7 Al₂O₃·CaCl₂, or C₁₁A₇CaCl₂ in the cement chemist notation.

References

Hosono, H.; Tanabe, K.; Takayama-Muromachi, E.; Kageyama, H.; Yamanaka, S.; Kumakura, H.; Nohara, M.; Hiramatsu, H.; Fujitsu, S. (2015). "Exploration of new superconductors and functional materials, and fabrication of superconducting tapes and wires of iron pnictides". Science and Technology of Advanced Materials. 16 (3): 033503. arXiv:1505.02240. Bibcode:2015STAdM..16c3503H. doi:10.1088/1468-6996/16/3/033503. PMC 5099821. PMID 27877784.
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.
Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C., eds. (1997). "Mayenite". Handbook of Mineralogy (PDF). Vol. III (Halides, Hydroxides, Oxides). Chantilly, VA, US: Mineralogical Society of America. ISBN 0962209724.
Chlormayenite. Mindat
Mayenite. Webmineral
Sokol E.V., Maksimova N.V., Nigmatulina E.N., Sharygin V.V. and Kalugin V.M. (2005) Combustion metamorphism, Novosibirsk: Publishing House of the SB RAS.
Ginley, David; Hosono, Hideo; Paine, David C. (2010). Handbook of Transparent Conductors. Springer Science & Business Media. pp. 318 ff. ISBN 978-1-4419-1638-9.
Palacios, L; Cabeza, A; Bruque, S; García-Granda, S; Aranda, M. A. (2008). "Structure and electrons in mayenite electrides". Inorganic Chemistry. 47 (7): 2661–7. doi:10.1021/ic7021193. PMID 18281939.
Boysen H., Kaiser-Bischoff I. and Lerch M. (2007) Anion Diffusion Processes in O- and N-Mayenite Investigated by Neutron Powder Diffraction. Bunsen Colloquium: Diffusion and Reactions in Advanced Materials (September 27th–28th, Clausthal-Zellerfeld, Germany) / The Open-Access Journal for the Basic Principles of Diffusion Theory, Experiment and Application.

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[hosono-1] Hosono, H.; Tanabe, K.; Takayama-Muromachi, E.; Kageyama, H.; Yamanaka, S.; Kumakura, H.; Nohara, M.; Hiramatsu, H.; Fujitsu, S. (2015). "Exploration of new superconductors and functional materials, and fabrication of superconducting tapes and wires of iron pnictides". Science and Technology of Advanced Materials. 16 (3): 033503. arXiv:1505.02240. Bibcode:2015STAdM..16c3503H. doi:10.1088/1468-6996/16/3/033503. PMC 5099821. PMID 27877784.

[2] 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.

[HBM-3] Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C., eds. (1997). "Mayenite". Handbook of Mineralogy (PDF). Vol. III (Halides, Hydroxides, Oxides). Chantilly, VA, US: Mineralogical Society of America. ISBN 0962209724.

[Mindat-4] Chlormayenite. Mindat

[Webmin-5] Mayenite. Webmineral

[6] Sokol E.V., Maksimova N.V., Nigmatulina E.N., Sharygin V.V. and Kalugin V.M. (2005) Combustion metamorphism, Novosibirsk: Publishing House of the SB RAS.

[b2-7] Ginley, David; Hosono, Hideo; Paine, David C. (2010). Handbook of Transparent Conductors. Springer Science & Business Media. pp. 318 ff. ISBN 978-1-4419-1638-9.

[8] Palacios, L; Cabeza, A; Bruque, S; García-Granda, S; Aranda, M. A. (2008). "Structure and electrons in mayenite electrides". Inorganic Chemistry. 47 (7): 2661–7. doi:10.1021/ic7021193. PMID 18281939.

[9] Boysen H., Kaiser-Bischoff I. and Lerch M. (2007) Anion Diffusion Processes in O- and N-Mayenite Investigated by Neutron Powder Diffraction. Bunsen Colloquium: Diffusion and Reactions in Advanced Materials (September 27th–28th, Clausthal-Zellerfeld, Germany) / The Open-Access Journal for the Basic Principles of Diffusion Theory, Experiment and Application.

Chlormayenite

See also

References