Skip to Main Content
GEOREF RECORD

Skorpionite, Ca (sub 3) Zn (sub 2) (PO (sub 4) ) (sub 2) CO (sub 3) (OH) (sub 2) .H (sub 2) O, a new mineral from Namibia; description and crystal structure

Werner Krause, Herta Effenberger, Heinz-Juergen Bernhardt and Olaf Medenbach
Skorpionite, Ca (sub 3) Zn (sub 2) (PO (sub 4) ) (sub 2) CO (sub 3) (OH) (sub 2) .H (sub 2) O, a new mineral from Namibia; description and crystal structure
European Journal of Mineralogy (May 2008) 20 (2): 271-280

Abstract

Skorpionite, Ca (sub 3) Zn (sub 2) (PO (sub 4) ) (sub 2) CO (sub 3) (OH) (sub 2) .H (sub 2) O, is a new secondary mineral from the Skorpion zinc deposit in south-western Namibia. Associated minerals are tarbuttite, hydrozincite and gypsum. Skorpionite forms colorless needle-like crystals of monoclinic symmetry that are elongated parallel to [001] with dominant {100} and {110}; additional forms are {111}, {221}, {131} and {-101}. D (meas.) = 3.15(3) g/cm (super 3) ; D (calc.) = 3.17 g/cm (super 3) . Skorpionite is optically biaxial negative, alpha = 1.5884(10), beta = 1.6445 (calc.), gamma = 1.6455(10), 2V = 15.0 degrees (5) (589 nm); no dispersion. Optical orientation is Y and c = 26 degrees (in acute beta ); Z = b. Means of 17 sets of microprobe analyses gave CaO 30.89, ZnO 28.83, P (sub 2) O (sub 5) 25.49, CO (sub 2) (calc.) 7.96, H (sub 2) O (calc.) 6.52, total 99.69 wt.%. The empirical formula (based on 14 oxygen atoms pfu) is Ca (sub 3.05) Zn (sub 1.96) (PO (sub 4) ) (sub 1.99) (CO (sub 3) ) (sub 1.00) OH) (sub 2.06) .0.98H (sub 2) O. Single-crystal X-ray investigations gave space group C2/c, with unit-cell parameters a = 19.045(3), b = 9.320(2), c = 6.525(1) Aa, beta = 92.73(2) degrees , V = 1156.9(4) Aa (super 3) , Z = 4. ZnO (sub 4) and PO (sub 4) tetrahedra are corner linked to corrugated sheets. The crystal structure forms a three-dimensional network of [Ca2 (sub 2) Zn (sub 2) (OH) (sub 2) (PO (sub 4) ) (sub 2) ] (super 0) and [Ca1(CO (sub 3) )(H (sub 2) O)] (super 0) layers that are linked by hydrogen bonds and by Ca-O bonds.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 20
Serial Issue: 2
Title: Skorpionite, Ca (sub 3) Zn (sub 2) (PO (sub 4) ) (sub 2) CO (sub 3) (OH) (sub 2) .H (sub 2) O, a new mineral from Namibia; description and crystal structure
Affiliation: Henriette-Lott-Weg 8, Hurth, Federal Republic of Germany
Pages: 271-280
Published: 200805
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 26
Accession Number: 2008-086486
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
N27°49'00" - N27°49'00", E16°36'00" - E16°36'00"
Secondary Affiliation: Universitaet Wien, AUT, AustriaRuhr-Universitaet Bochum, DEU, Federal Republic of Germany
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200826
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal