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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 48 (1964)

Issue: 4. (April)

First Page: 541

Last Page: 541

Title: Pyrochlore from Oka, Province of Quebec, Canada: ABSTRACT

Author(s): Guy Perrault

Article Type: Meeting abstract


Five varieties of pyrochlore have been identified at Oka.

1. A metamict variety containing uranium and thorium; bright red color, fine-grained, associated with ijolitic rocks. a0 = 10.43 ± 0.05 A.

2. A certain variety; chocolate-brown, coarse-grained, euhedral (octahedra and dodecahedra), associated soda pyroxene marble. G = 4.38, a0 = 10.393 ± .001 A.

3. A thorian variety; brownish red, in calcite-forsterite rock. a0 = 10.428 ± .005 A.

4. A zirconian variety; reddish brown to black, occurrence in carbonatite. a0 = 10.395 ± .001 A.

5. A fifth variety is known to be high in Nb2O5; the complete chemical composition is not available but the Nb2O5 content is greater than 60%.

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Copyright 1997 American Association of Petroleum Geologists