Henrymeyerite

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Henrymeyerite
General and classification
other names
  • Ba-Fe-Priderite
  • IMA 1999-016
chemical formula Ba (Ti 4+ 7 Fe 2+ ) O 16
Mineral class
(and possibly department)
Oxides and hydroxides
System no. to Strunz
and to Dana
4.DK.05b ( 8th edition : IV / D.08)
07.09.01.06
Crystallographic Data
Crystal system tetragonal
Crystal class ; symbol tetragonal-dipyramidal; 4 / m
Space group I 4 / m (No. 87)Template: room group / 87
Lattice parameters a  = 10,219  Å ; c  = 2.963 Å
Formula units Z  = 1
Physical Properties
Mohs hardness 5 to 6
Density (g / cm 3 ) measured: 4.0; calculated: 4.2
Cleavage no
Break ; Tenacity splintery
colour Black, slightly grayish brown in reflected light
Line color reddish brown
transparency opaque
shine Diamond luster

Henrymeyerite is a very rare mineral from the mineral class of oxides and hydroxides . It crystallizes in the tetragonal crystal system with the chemical composition Ba (Ti 4+ 7 Fe 2+ ) O 16 . The mineral forms crystals up to 0.2 mm in size .

Etymology and history

Henrymeyerite was first described in 2000 by Roger H. Mitchell, Viktor N. Yakovenchuk, Anton R. Chakhmouradian, Peter C. Burns, and Yakov A. Pakhomovsky. Even before its release, it was recognized as the 16th mineral by the CNMNC in 1999 . It is named after Henry Oostenwald Albertjin Meyer (1937-1995) to honor him for his services in the field of petrology and mineralogy of xenolites and kimberlite .

classification

In the outdated, but still in use 8th edition of the mineral classification according to Strunz , henrymeyerite is classified in the class of "oxides and hydroxides" and there in the group "ratio of metal to oxygen 1: 2". There it can be found in the cryptomelan group, which in addition to cryptomelan also includes Cesàrolith , Coronadit , Hollandit , Manjiroit , Mannardit , Priderit , Redledgeit , Strontiomelan .

In the newer, comprehensively revised 9th edition of the mineral classification according to Strunz , Henrymeyerite is also classified in the class of "oxides and hydroxides" and there in the group "ratio of metal to oxygen 1: 2". However, this is further subdivided according to the size of the cations , so that the mineral can be found in the subgroup “With large or medium-sized cations” according to its composition. There it forms the Hollandit group with Akaganeit , Coronadit, Hollandit, Manjiroit, Mannardit, Priderit, Redledgeit.

In the systematics of minerals according to Dana , henrymeyerite is also found among the oxides and hydroxides, there in the group of "multiple oxides". Within the group, it is also in the "cryptomelan group" and has the system number 07.09.01.06 .

Crystal structure

Henrymeyerite crystallizes tetragonally in the space group space group I 4 / m (space group no. 87) with the lattice parameters a  = 10.219  Å and c  = 2.963 Å as well as 8 formula units per unit cell . Template: room group / 87

Education and Locations

Very few sites are known of the mineral. These are located on the Russian peninsula Kola in the Murmansk Oblast in the Chibinen (English: Khibiny massif), in the Kowdor massif and in the Lowosero tundra massif, in the Czech Republic in Moravia and in the USA in the state of Montana .

See also

literature

  • Roger H. Mitchell, Viktor N. Yakovenchuk, Anton R. Chakhmouradian, Peter C. Burns, Yakov A. Pakhomovsky: Henrymeyerite, a new hollandite-type Ba – Fe titanate from the konvor complex, russia In: Canadian Mineralogist , Vol. 38 , June 2000, pp. 617–626 ( PDF )
  • Lia N. Konarko, Gero Kurat , Theodoros Ntaflos: Henrymeyerite in the metasomatized upper mantle of eastern antarctica In: Canadian Mineralogist , Vol. 45, No. 3, 2007, pp. 497-501

Web links

Individual evidence

  1. ^ Mineralienatlas: Henrymeyerit
  2. The new IMA List of Minerals , as of September 2014
  3. a b c d Handbook of Mineralogy - Henrymeyerite ( PDF , English)
  4. ^ A b Roger H. Mitchell, Viktor N. Yakovenchuk, Anton R. Chakhmouradian, Peter C. Burns, Yakov A. Pakhomovsky: Henrymeyerite, a new hollandite-type Ba – Fe titanate from the konvor complex, russia In: Canadian Mineralogist , Vol. 38, June 2000, pp. 617–626 ( PDF )
  5. ^ Mindat - Henrymeyerite