Orbiculite
by Mario Wipki, GFZ Potsdam, Potsdam, Germany
Orbiculite from W-Australia - can be visited opposite of the holocaust memorial in Tiergarten. Maybe the oldest exposed rock in Berlin - older than 2 billion years. See also www.globalstone.de/ comes from near Mount Magnet in Western Australia. The orbicules occur in a granodiorite matrix. They consist of andesine, plagioclase, hornblende biotite arranged radially around a core of plagioclase or hornblende or less commonly mafic schist.
Submitted on 10 Jan 2010
Categories
- Earth Magnetism & Rock Physics (343)
- Field (2737)
- Geochemistry, Mineralogy, Petrology & Volcanology (854)
Location
- Oceania (220)
- Australia and New Zealand (2)
- Exact location (117.8517 E, -28.0611 S)
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Credit: Mario Wipki (distributed via imaggeo.egu.eu)
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Klaus Gessner 5 years, 12 months ago
Please follow this link for information on where this rock naturally occurs, including geological background; http://www.nationalrockgarden.org.au/rock-collection-2/rock-listing/show/11