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Note on jacupirangite in Tasmania


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Twelvetrees, William Harper 1903 , 'Note on jacupirangite in Tasmania' , Papers & Proceedings of the Royal Society of Tasmania , pp. 73-74 .

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The wonderful aptitude of the alkaline magmas for differentiation
is strikingly exhibited by the nepheline rocks at
Port Cygnet. The promontory at the Regatta Ground south
of the jetty consists of a central spur of elaeolite syenite,
varying into alkali syenite, a light coloured alkaline eruptive
of the character called leucocratic by Brogger, or salic
in the new American terminology. The margins, especially
the southern one, consist of the dark elaeolite-pyroxene rock
known as jacupirangite. This locality name was given by
Derby in 1891 to rocks in Brazil occurring as differentiation
products in association with elaeolite syenite, usually laminated
in habit and intersected by small dykes of the latter
rock. The nepheline-pyroxene varieties pass into magnetitepyroxene
varieties and the latter into nearly pure titaniferous
iron. This ore is found in Alno (Sweden) connected with
elaeolite syenite.

Item Type: Article
Authors/Creators:Twelvetrees, William Harper
Keywords: Royal Society of Tasmania, Van Diemens Land, VDL, Hobart Town, natural sciences, proceedings, records
Journal or Publication Title: Papers & Proceedings of the Royal Society of Tasmania
Collections: Royal Society Collection > Papers & Proceedings of the Royal Society of Tasmania
Additional Information:

In 1843 the Horticultural and Botanical Society of Van Diemen's Land was founded and became the Royal Society of Van Diemen's Land for Horticulture, Botany, and the Advancement of Science in 1844. In 1855 its name changed to Royal Society of Tasmania for Horticulture, Botany, and the Advancement of Science. In 1911 the name was shortened to Royal Society of Tasmania.

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