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dimetric crystals

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Journal Article
Published: 01 August 1978
American Mineralogist (1978) 63 (7-8): 747.
...E. E. Foord; C. G. Cunningham Abstract Certain dimetric crystals exhibit anomalous biaxiality (optic axial angle). Changes in biaxiality as a function of temperature for several dimetric crystals—elbaite tourmaline, jeremejevite, A1 6 B 5 O 15 (F,OH) 3 , and synthetic emerald (beryl)—have been...
Journal Article
Published: 01 April 1978
American Mineralogist (1978) 63 (3-4): 316–325.
...), rutile, jeremejevite [Al 6 B 5 O 15 (F,OH) 3 ], apatite, kleinite [Hg 2 N(Cl,SO 4 )· x H 2 O], beryl, quartz, and elbaite. The space-group symmetries of the specimens, determined by single-crystal X-ray techniques, showed no deviations from previously-observed crystallographic symmetry, yet significant...
Journal Article
Published: 01 April 1935
American Mineralogist (1935) 20 (4): 292–306.
...D. Jerome Fishek Abstract In Figure 1 crystals are classified according to increasing symmetry into two phyla (axial and axihedral), three divisions (trimetric, dimetric, monometric), six systems, seven systems and subsystems, seven families (monaxial, polyaxial, anastrephaxial, orthaxihedral...
Book Chapter

Series: GSA Memoirs
Published: 01 April 1954
DOI: 10.1130/MEM60-pvii
... of a cell, which must be uniquely determined. Arbitrary rules, based on metric considerations, insure this uniqueness. All crystal descriptions have been made to conform to them, at the cost of a great many reorientations. An axial ratio, a/b in the trimetric systems and c/a in the dimetric, or the cell...
Journal Article
Published: 01 April 2007
American Mineralogist (2007) 92 (4): 675–686.
... , 90 , 481 –487. Foord, E.E. and Cunningham, C.G. ( 1978 ) Thermal transformation of anomalously biaxial dimetric crystals. American Mineralogist , 63 , 747 –749. Foord, E.E. and Mills, B.A. ( 1978 ) Biaxiality in “isometric” and “dimetriccrystals. American Mineralogist , 63 , 316 –325...
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Journal Article
Published: 13 February 2017
European Journal of Mineralogy (2017) 29 (5): 915–922.
.... Campeny M. Villanova C. Tauler E. Melgarejo J.C. 2009 Mineralogía del Depósito de Uranio Eureka (Castell-estaó, Pirineo, Cataluña) Macla 11 53 54 Foord and Mills, 1978 Foord E.E. & Mills B.A. 1978 Biaxiality in ‘isometric’ and ‘dimetriccrystals Am. Mineral...
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Journal Article
Published: 01 September 2018
American Mineralogist (2018) 103 (9): 1435–1444.
...’ and ‘dimetriccrystals . American Mineralogist , 63 , 316 – 325 . Frost , R. Bouzaid , J. Musumeci , A. Kloprogge , J. , and Martens , W. 2006 Thermal decomposition of the synthetic hydrotalcite iowaite . Journal of Thermal Analysis and Calorimetry , 86 , 437 – 441...
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Journal Article
Published: 01 February 2011
The Canadian Mineralogist (2011) 49 (1): 63–88.
... ): Tetrahedrally coordinated boron in Al-rich tourmaline and its relationship to the pressure–temperature conditions of formation . Eur. J. Mineral. 20 , 881 – 888 . Foord E.E. Cunningham C.G. ( 1978 ): Thermal transformation of anomalously biaxial dimetric crystals . Am. Mineral. 63 , 747...
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Journal Article
Published: 01 March 2023
American Mineralogist (2023) 108 (3): 572–583.
... , E.E. and Mills , B.A. ( 1978 ) Biaxiality in “isometric” and “dimetriccrystals . American Mineralogist , 63 , 316 – 325 . Frank-Kamenetskaya , O.V. , Rozhdestvenskaya , I.V. , Shtukenberg , A.G. , Bannova , I.I. , and Skalkina , Yu.A. ( 2007 ) Dissymmetrization...
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Journal Article
Published: 01 October 2001
American Mineralogist (2001) 86 (10): 1219–1230.
... Crystallographica , 23 , 220 – 230 . Foord , E.E. and Mills , B.A. ( 1978 ) Biaxiality in ‘isometric’ and ‘dimetriccrystals . American Mineralogist , 63 , 316 – 325 . Foreman , D.W. ( 1968 ) Neutron and X-ray diffraction study of Ca 3 Al 2 (O 4 D 4 ) 3 . Journal of Chemical...
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Journal Article
Published: 01 February 2011
The Canadian Mineralogist (2011) 49 (1): 41–56.
.... Mills B.A. ( 1978 ): Biaxiality in isometric and dimetric crystals . Am. Mineral. 63 , 316 – 325 . Francis C.A. Dyar M.D. Williams M.L. Hughes J.M. ( 1999 ): The occurrence and crystal structure of foitite from a tungsten-bearing vein at Copper Mountain, Taos County, New...
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Journal Article
Published: 01 February 2008
American Mineralogist (2008) 93 (2-3): 414–425.
... and layered structure of the micas, Cibin et al. (2006) simplified the general formula to only the horizontal angle ( ) that the crystal plane forms with the impinging SR beam polarization direction, thus assuming dichroism, which in fact is valid for dimetric structures or for any structure developed...
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Journal Article
Published: 01 July 2006
American Mineralogist (2006) 91 (7): 1150–1162.
...- to long-range order. * E-mail: mottana@uniroma3.it 27 02 2006 21 07 2005 © 2006 American Mineralogist 2006 Our micas are members of the phlogopite–annite and poly-lithionite–siderophyllite joins. Their crystal structures were recently refined and discussed in detail...
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Journal Article
Published: 01 January 2002
Reviews in Mineralogy and Geochemistry (2002) 50 (1): 405–444.
... classes are represented, although the occurrence of some arsenates is considered possible. Part of the reason for the pattern above is the crystal-chemical behavior of Be, one of the classic amphoteric elements, which acts as a cation in acidic environments but participates in complex anions under...
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Journal Article
Journal: SEG Discovery
Published: 01 April 1991
SEG Discovery (1991) (05): 1–28.
..., "Biaxiality in be a working hypothesis built around a 'Isometric' and 'Dimetric' Crystals": American Mineralogist, v. 27, p. 762-768. geologic framework. Much work is needed Mineralogist, v. 63, p. 315-325. Seal, R.R., III, 1990, "A Reconnaissance Study on the geology of emerald deposits and on GHbelin...