Chlormayenite (original) (raw)

Formula:

Ca12Al14O32[◻4Cl2]

Originally assumed to be Ca12Al14O33.

Specific Gravity:

2.85 (Calculated)

Name:

Originally named mayenite after the type locality, (near) Mayen, Eifel, Germany. Renamed to chlormayenite in 2013 (IMA 13-C) after the mayenite supergroup was created and the original mayenite was found to contain essential Cl.

The Cl analogue of fluormayenite and vacancy analogue of chlorkyuygenite.

The Mayenite Supergroup was revised in 2013 (IMA 13-C); as a consequence, the mineral brearleyite has been discredited as being the same as chlormayenite; mayenite has been redefined and renamed chlormayenite; kyuygenite has been renamed chlorkyuygenite.
See also Galuskin et al. (2009, 2010).

Well-known cement phase.
Note that synthetic pure Ca12Al14O33 is known, but it is stabilised by moisture; the content of water reaches a maximum of 1.3% at ~950 °C and is present as OH groups. The composition of this phase is best described as Ca12Al14O32(OH)2 (Nurse et al., 1965a,b).

The mayenite supergroup species (in general, coded as C12A7, or C12A7e-) show unique electrochemical properties, with some anions in their structure (e.g., oxygen anions) migrating through the structure. As such, the mayenites behave as metals even though they are very non-metal in terms of general chemistry. Transitions seen in their structure may be related to superconducting. The mayenites represent a group of chemicals known as "salts of an electron", also known as electrides (e.g., Weber et al., 2021).

Long-form identifier:

mindat:1:1:2606:8

4244fc8e-6c89-4165-8cf8-ef2d3271aef9

4.CC.20

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
C : Metal: Oxygen = 2: 3,3: 5, and similar
C : With large and medium-sized cations

7.11.3.1

7 : MULTIPLE OXIDES
11 : Miscellaneous

7.4.13

7 : Oxides and Hydroxides
4 : Oxides of Be, Mg and the alkaline earths

Birefringence:

Isotropic minerals have no birefringence

Class (H-M):

43_m_ - Hextetrahedral

Cell Parameters:

a = 11.98 Å

Unit Cell V:

1,719.37 ų (Calculated from Unit Cell)

Comment:

Cell parameter ranges from 11.97-12.02 A. Former "chlormayenite" (IMA2010-062) has a = 11.9794 A.

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0009964	Chlormayenite	Boysen H, Lerch M, Stys A, Senyshyn A (2007) Structure and oxygen mobility in mayenite (Ca12Al14O33): a high-temperature neutron powder diffraction study Acta Crystallographica B63 675-682		2007	synthetic	0	293
0009965	Chlormayenite	Boysen H, Lerch M, Stys A, Senyshyn A (2007) Structure and oxygen mobility in mayenite (Ca12Al14O33): a high-temperature neutron powder diffraction study Acta Crystallographica B63 675-682		2007	synthetic	0	293
0009966	Chlormayenite	Boysen H, Lerch M, Stys A, Senyshyn A (2007) Structure and oxygen mobility in mayenite (Ca12Al14O33): a high-temperature neutron powder diffraction study Acta Crystallographica B63 675-682		2007	synthetic	0	293
0009967	Chlormayenite	Boysen H, Lerch M, Stys A, Senyshyn A (2007) Structure and oxygen mobility in mayenite (Ca12Al14O33): a high-temperature neutron powder diffraction study Acta Crystallographica B63 675-682		2007	synthetic	0	293
0010566	Chlormayenite	Bussem W, Eitel A (1936) Die struktur des pentacalciumtrialuminats Zeitschrift fur Kristallographie 95 175-188		1936	0	293
0017939	Chlormayenite	Buessem W, Eitel A (1936) Die Struktur des Pentacalciumtrialuminats _cod_database_code 1011034 Zeitschrift fur Kristallographie 95 175-188		1936	0	293
0019192	Chlormayenite	Iwata T, Haniuda M, Fukuda K (2008) Crystal structure of Ca12Al14O32Cl2 and luminescence properties of Ca12Al14O32Cl2:Eu2+ Journal of Solid State Chemistry 181 51-55	2008	synthetic	0	293
0018992	Chlormayenite	Galuskin E V, Kusz J, Armbruster T, Bailau R, Galuskina I O, Ternes B, Murashko M (2012) A reinvestigation of mayenite from the type locality, the Ettringer Bellerberg volcano near Mayen, Eifel district, Germany Mineralogical Magazine 76 707-716	2012	Ettringer Bellerberg volcano near Mayen, Eifel district, Germany	0	293
0014739	Chlormayenite	Bartl H, Scheller T (1970) Zur struktur des 12CaO*7Al2O3 Neues Jahrbuch fur Mineralogie, Monatshefte 1970 547-552	1970	synthetic	0	293

CIF Raw Data - click here to close

Powder Diffraction Data:

Comments:

Data for former "chlormayenite" (IMA2010-062).

General Appearance of Type Material:

Colorless rounded grains having no recognizable crystal faces, with a maximum diameter of 60 microns.

Place of Conservation of Type Material:

Mineralogisches Museum, Mineralogisch-Petrographisches Institut, Universität Köln, Germany, M5026,86 (Holotype).
National Museum of Natural History, Washington, D.C., USA, 120045A0 (Type).
National Museum of Natural History, Washington, D.C., USA,, USNM 7590, (Type).

Geological Setting of Type Material:

Thermally metamorphosed marly limestone inclusions in effusive volcanic rocks.

Associated Minerals at Type Locality:

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.