Abstract

An unusual occurrence of epigenetic common opal, apparently derived from the normal ground-waters of the Hawkesbury sandstone formation of the Sydney Basin, is described. The opal forms simple and botryoidal incrustations, simple and coralloidal stalactitic structures and also is deposited on stalactites of lamellar limonite. Refractive index values vary widely and haphazardly between 1.414 and 1.443.

 
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Bibliographic Data

Short Form
Lovering, 1952, Rec. Aust. Mus. 23(1): 29–32
Author
J. F. Lovering
Year
1952
Title
Epigenetic common opal from the Hawkesbury Sandstone Formation of the Sydney Basin
Serial Title
Records of the Australian Museum
Volume
23
Issue
1
Start Page
29
End Page
32
DOI
10.3853/j.0067-1975.23.1952.619
Language
English
Plates
plate iv
Date Published
16 June 1952
Cover Date
16 June 1952
ISSN
0067-1975
CODEN
RAUMAJ
Publisher
The Australian Museum
Place Published
Sydney, Australia
Digitized
22 April 2009
Available Online
22 July 2009
Reference Number
619
EndNote
/Uploads/Journals/17372/619.enw
Title Page
/Uploads/Journals/17372/619.pdf
File size: 141kB
Complete Work
/Uploads/Journals/17372/619_complete.pdf
File size: 863kB