scholarly journals Nomenclature of the magnetoplumbite group

2020 ◽  
Vol 84 (3) ◽  
pp. 376-380 ◽  
Author(s):  
Dan Holtstam ◽  
Ulf Hålenius
Keyword(s):  
Crystal Structure ◽  
General Formula ◽  
Classification Scheme ◽  
Hierarchical Level ◽  
Mineral Species ◽  
New Mineral ◽  
Definition Of ◽  
Strong Order

AbstractA nomenclature and classification scheme has been approved by IMA–CNMNC for the magnetoplumbite group, with the general formula A[B12]O19. The classification on the highest hierarchical level is decided by the dominant metal at the 12-coordinated A sites, at present leading to the magnetoplumbite (A = Pb), hawthorneite (A = Ba) and hibonite (A = Ca) subgroups. Two species remain ungrouped. Most cations, with valences from 2+ to 5+, show a strong order over the five crystallographic B sites present in the crystal structure, which forms the basis for the definition of different mineral species. A new mineral name, chihuahuaite, is introduced and replaces hibonite-(Fe).

scholarly journals SCHLEMAITE, (Cu, )6(Pb,Bi)Se4, A NEW MINERAL SPECIES FROM NIEDERSCHLEMA ALBERODA, ERZGEBIRGE, GERMANY: DESCRIPTION AND CRYSTAL STRUCTURE

2003 ◽  
Vol 41 (6) ◽  
pp. 1433-1444 ◽  
Author(s):  
H.-J. Forster ◽  
M. A. Cooper ◽  
A. C. Roberts ◽  
C. J. Stanley ◽  
A. J. Criddle ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Mineral Species ◽  
New Mineral ◽  
New Mineral Species

KIRCHHOFFITE, CsBSi2O6, A NEW MINERAL SPECIES FROM THE DARAI-PIOZ ALKALINE MASSIF, TAJIKISTAN: DESCRIPTION AND CRYSTAL STRUCTURE

2012 ◽  
Vol 50 (2) ◽  
pp. 523-529 ◽  
Author(s):  
A. A. Agakhanov ◽  
L. A. Pautov ◽  
V. Y. Karpenko ◽  
E. Sokolova ◽  
F. C. Hawthorne
Keyword(s):  
Crystal Structure ◽  
Mineral Species ◽  
New Mineral ◽  
New Mineral Species ◽  
Alkaline Massif

Lusernaite-(Y), Y4Al(CO3)2(OH,F)11{middle dot}6H2O, a new mineral species from Luserna Valley, Piedmont, Italy: Description and crystal structure

2013 ◽  
Vol 98 (7) ◽  
pp. 1322-1329 ◽  
Author(s):  
C. Biagioni ◽  
E. Bonaccorsi ◽  
F. Camara ◽  
M. Cadoni ◽  
M. E. Ciriotti ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Mineral Species ◽  
New Mineral ◽  
New Mineral Species

FLUORVESUVIANITE, Ca19(Al,Mg,Fe2+)13[SiO4]10[Si2O7]4O(F,OH)9, A NEW MINERAL SPECIES FROM PITKARANTA, KARELIA, RUSSIA: DESCRIPTION AND CRYSTAL STRUCTURE

2003 ◽  
Vol 41 (6) ◽  
pp. 1371-1380 ◽  
Author(s):  
S. N. Britvin ◽  
A. A. Antonov ◽  
S. V. Krivovichev ◽  
T. Armbruster ◽  
P. C. Burns ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Mineral Species ◽  
New Mineral ◽  
New Mineral Species

PUTZITE, (Cu4.7Ag3.3) 8GeS6, A NEW MINERAL SPECIES FROM CAPILLITAS, CATAMARCA, ARGENTINA: DESCRIPTION AND CRYSTAL STRUCTURE

2004 ◽  
Vol 42 (6) ◽  
pp. 1757-1769 ◽  
Author(s):  
W. H. Paar ◽  
A. C. Roberts ◽  
P. Berlepsch ◽  
T. Armbruster ◽  
D. Topa ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Mineral Species ◽  
New Mineral ◽  
New Mineral Species

On the Calculation of the Relative Amounts of Endmember Constituents For Garnet

2021 ◽  
Author(s):  
Frank C. Hawthorne
Keyword(s):  
Unique Solution ◽  
General Formula ◽  
Simultaneous Equations ◽  
Mineral Species ◽  
Chemical Formula ◽  
Sequence Dependent ◽  
Definition Of

ABSTRACT It is commonly accepted that the calculation of the proportions of endmember constituents in garnet is dependent on the particular sequence of calculating the amounts of the endmembers, and this belief has been used to justify avoiding the use of endmembers in the definition of a mineral species. Calculating the amounts of endmember constituents to represent a specific mineral formula involves the solution of a set of simultaneous equations, and hence the idea that the solution is dependent on the order in which the amounts of endmember constituent are determined conflicts with the meaning of the term “simultaneous equations”. Here I examine the data on which these conclusions are based and show that these sequence-dependent results arise because of the use of non-stoichiometric formulae that are not electroneutral. If a garnet formula is adjusted slightly such that it exactly fits the general formula of a garnet, [8]X3[6]Y2[4]Z3O12, and is electroneutral, the simultaneous equations relating its chemical formula to a set of endmember constituents have a single unique solution. Thus, the argument that has been used to justify avoiding the use of endmembers in the definition of a mineral species is specious.

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