Research output: Contribution to journal › Article › peer-review
Influences of extraframework cations on features of natrolite group zeolites : The crystal structure of partly dehydrated K-containing paranatrolite. / Seryotkin, Yurii; Bakakin, Vladimir.
In: Zeitschrift fur Kristallographie, Vol. 230, No. 4, 01.04.2015, p. 233-242.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Influences of extraframework cations on features of natrolite group zeolites
T2 - The crystal structure of partly dehydrated K-containing paranatrolite
AU - Seryotkin, Yurii
AU - Bakakin, Vladimir
PY - 2015/4/1
Y1 - 2015/4/1
N2 - The partly dehydrated paranatrolite from the Khibiny massif, Russia, Na 1.88K0.22Ca0.06 [Al2.24Si2.76O10]·2.5H2O, has a space group F1d1 and the unit cell parameters a = 18.6586(5), b = 18.6536(5), c = 6.64119(13) A, β = 90.199(2)°, and Z = 8. The dominant Na+ cations are located nearby the sodium positions in the natrolite structure. The potassium cations occupy two individual positions. Their different occupancies define the retention of the monoclinic distortion of the structure. H2O molecules statistically occupy eight positions, six being generated with a triple splitting of two positions. Three kinds of main local cation-water assemblages were distinguished, two being similar to the assemblages in the initial high-water paranatrolite. The comparison with the gonnardite and paranatrolite structures determined previously was carried out. Common structural characteristics of natrolite group minerals are suggested from the local water-cation assemblages.
AB - The partly dehydrated paranatrolite from the Khibiny massif, Russia, Na 1.88K0.22Ca0.06 [Al2.24Si2.76O10]·2.5H2O, has a space group F1d1 and the unit cell parameters a = 18.6586(5), b = 18.6536(5), c = 6.64119(13) A, β = 90.199(2)°, and Z = 8. The dominant Na+ cations are located nearby the sodium positions in the natrolite structure. The potassium cations occupy two individual positions. Their different occupancies define the retention of the monoclinic distortion of the structure. H2O molecules statistically occupy eight positions, six being generated with a triple splitting of two positions. Three kinds of main local cation-water assemblages were distinguished, two being similar to the assemblages in the initial high-water paranatrolite. The comparison with the gonnardite and paranatrolite structures determined previously was carried out. Common structural characteristics of natrolite group minerals are suggested from the local water-cation assemblages.
KW - Crystal structure
KW - Gonnardite
KW - Natrolite group
KW - Paranatrolite
KW - Water-cation assemblage
UR - http://www.scopus.com/inward/record.url?scp=84929012721&partnerID=8YFLogxK
U2 - 10.1515/zkri-2014-1807
DO - 10.1515/zkri-2014-1807
M3 - Article
AN - SCOPUS:84929012721
VL - 230
SP - 233
EP - 242
JO - Zeitschrift fur Kristallographie
JF - Zeitschrift fur Kristallographie
SN - 0044-2968
IS - 4
ER -
ID: 25761780