Acta Geologica Hungarica
Volume/Issue:
Volume 46: Issue 3
An unknown Ni-Al hydrosilicate
Author:
Zoran J. Maksimović Serbian Academy of Sciences and Arts, Belgrade Knez Mihailova 35, 11000 Belgrade, Yugoslavia

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Pages:
313–320
Online Publication Date:
22 Jul 2005
Publication Date:
01 Dec 2003
Article Category:
Research Article
DOI:
https://doi.org/10.1556/ageol.46.2003.3.6
Keywords:
halloysite; halloysite; halloysite; Karstic nickel deposits; unknown Ni-Al hydrosilicate; takovite
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An "unknown Ni-Al hydrosilicate" was found in the karstic nickel deposits in the localities Ba and Takovo in Serbia, and Aghios Ioannis in Greece. It occurs in fine-grained bluish-green and green aggregates with takovite and hydrated halloysite. It is an epigenetic product in the karstic nickel deposit. X-ray powder diffraction (XRPD) data are indexed with a monoclinic unit cell, a = 8.524 (4), b = 7.490 (3), c = 24.214 (6) Å, b = 104.55 (6)°, V = 1545.9 Å3. The thermal study has shown a characteristic dehydroxylation effect at 450 °C, which distinguishes this mineral from takovite and halloysite. The infra-red technique is very sensitive for the detection of the "unknown Ni-Al hydrosilicate": an absorption band between 1250 cm-1 and 1270 cm-1 is very characteristic for this mineral. From chemical analyses of the admixture of this mineral and hydrated halloysite in different proportions from the Aghios Ioannis deposit in Greece, after removal of impurities, the calculated formula is close to Ni2.00 Al2.00 (Si1.93 Al0.07) on the basis of 12 (O,OH).

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Cover Acta Geologica Hungarica
Acta Geologica Hungarica
Print ISSN:
0236-5278
Online ISSN:
1588-2594

Acta Geologica Hungarica
Language English
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Year of
Foundation		 1952
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Programme		 changed title
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per Year		  
Founder Magyar Tudományos Akadémia  
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Address		 H-1051 Budapest, Hungary, Széchenyi István tér 9.
Publisher Akadémiai Kiadó
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Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
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Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5278 (Print)
ISSN 1588-2594 (Online)

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