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GEOREF RECORD

Rodolicoite and grattarolaite, two new phosphate minerals from Santa Barbara Mine, Italy

Curzio Cipriani, Marcello Mellini, Giovanni Pratesi and Cecilia Viti
Rodolicoite and grattarolaite, two new phosphate minerals from Santa Barbara Mine, Italy
European Journal of Mineralogy (October 1997) 9 (5): 1101-1106

Abstract

Grattarolaite and rodolicoite, two new anhydrous iron phosphates, were found at Santa Barbara lignite mine as reddish-brown nodules. They occur as small crystallites (< 1000 A), associated in fine-scale intergrowth that prevent the measurement of physical properties. Grattarolaite is trigonal, with space group R3m; rodolicoite is also trigonal, but with space group P3 (sub 1) 21. Cell dimensions, calculated from X-ray powder patterns, are: grattarolaite a = 7.994(4), c = 6.855(4) A, V = 379.4 A (super 3) , Z = 3; rodolicoite a = 5.048(3), c = 11.215(8) A, V= 247.5 A (super 3) , Z = 3. The chemical data, obtained by transmission electron microscope microanalysis, give the composition Fe (sub 2.99) P (sub 1.01) O (sub 7.00) for grattarolaite and Fe (sub 1.04) P (sub 0.96) O (sub 4.00) for rodolicoite. Infrared spectroscopy and thermal analysis confirm the anhydrous nature of both minerals.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 9
Serial Issue: 5
Title: Rodolicoite and grattarolaite, two new phosphate minerals from Santa Barbara Mine, Italy
Affiliation: Universita di Firenze, Museo di Storia Naturale, Florence, Italy
Pages: 1101-1106
Published: 199710
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 20
Accession Number: 1997-077056
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 1 table
Secondary Affiliation: Universita di Siena, Siena, ITA, Italy
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 199724
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