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GEOREF RECORD

The crystal structure of gearksutite, CaAlF (sub 4) (OH).H (sub 2) O

Fabio Marchetti and Natale Perchiazzi
The crystal structure of gearksutite, CaAlF (sub 4) (OH).H (sub 2) O
American Mineralogist (January 2000) 85 (1): 231-235

Abstract

The discovery of unusually well-crystallized samples of gearksutite allowed determination of its crystal structure. The crystals belong to space group P1, a = 4.940(1), b = 6.810(1), c = 6.978(1) Aa; alpha = 101.12(1), beta = 94.86(1), gamma = 110.07(1) degrees ; V = 213.43(6) Aa (super 3) ; Z = 2. The structure consists of layers of eightfold-coordinated calcium polyhedra connected through pairs of [Al (sub 2) F (sub 8) (OH) (sub 2) ] octahedra which are oriented identically, similar to those observed in other hydroxyl aluminum fluorides. A comparison with other minerals of similar composition is made. The structure data allowed us to reliably index the powder pattern and to show that the reflection intensities are strongly affected by preferred orientation.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 85
Serial Issue: 1
Title: The crystal structure of gearksutite, CaAlF (sub 4) (OH).H (sub 2) O
Affiliation: Universita di Roma "La Sapienza," Dipartimento di Ingegneria Chimica, Rome, Italy
Pages: 231-235
Published: 200001
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 17
Accession Number: 2000-026948
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
N61°10'00" - N61°10'00", W48°12'00" - W48°12'00"
Secondary Affiliation: Universita di Pisa, ITA, Italy
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200009
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