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GEOREF RECORD

Horvathite-(Y), rare-earth fluorocarbonate, a new mineral species from Mont Saint-Hilaire, Quebec

Joel D. Grice and George Y. Chao
Horvathite-(Y), rare-earth fluorocarbonate, a new mineral species from Mont Saint-Hilaire, Quebec
The Canadian Mineralogist (June 1997) 35, Part 3: 743-749

Abstract

Horvathite-(Y) occurs as tabular crystals up to 1 X 1 X 0.25 mm stacked in fan-shaped groups in a large pegmatite dyke in nepheline syenite at the Poudrette quarry. Mont Saint-Hilaire. It is associated with microcline, aegirine, dawsonite, rhodochrosite, sodalite, natrolite, albite, serandite, siderite, taenolite, catapleiite, astrophyllite and genthelvite. Horvathite-(Y) is colourless to pale beige with a very good 100 cleavage, H. approximately 4, D (sub calc) 3.613 g/cm (super 3) ; alpha 1.457, beta 1.543, Gamma 1.622, 2V<F128MV>a<F255D> 82 degrees . EPMA gave Na (sub 2) O 12.62, CaO 1.86, Y (sub 2) O (sub 3) 45.07, Gd (sub 2) O (sub 3) 0.45, Dy (sub 2) O (sub 3) 2.49, Er (sub 2) O (sub 3) 3.02, Yb (sub 2) O (sub 3) 1.64, Ho (sub 2) O (sub 3) 0.81, Tb (sub 2) O (sub 3) 0.12, F 17.22, CO (sub 2) 19.83, less O = F 7.23, = 97.90, leading to the idealized formula NaY(CO (sub 3) )F (sub 2) . Indexed XRD powder data are tabulated; strongest lines 3.477(100), 5.19(90), 2.800(50), 2.087(50), 2.057(50), 1.966(50), 1.849(50), 1.763(50) Aa; a 6.964, b 9.173, c 6.302 Aa, V 402.6 Aa (super 3) ; space group Pmcn, Z = 4. The structure has been refined to R 1.6; it is layered ^ [100], with a Na-Y-carbonate group layer and a layer of F atoms; the structure is unique but resembles that of synthetic BaCu(CO (sub 3) ) (sub 2) . The name is for Elsa and Lazlo Horvath for their dedication to the Mont Saint-Hilaire minerals.


ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: 35, Part 3
Title: Horvathite-(Y), rare-earth fluorocarbonate, a new mineral species from Mont Saint-Hilaire, Quebec
Affiliation: Canadian Museum of Nature, Research Division, Ottawa, ON, Canada
Pages: 743-749
Published: 199706
Text Language: English
Summary Language: French
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
References: 22
Accession Number: 1999-062357
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
N45°34'00" - N45°34'00", W73°12'00" - W73°12'00"
Secondary Affiliation: Carleton University, CAN, Canada
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199921
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