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Abstract

The absence of any reference in the records of this Society
to the class of volcanic products to which basalt-glass belongs
may justify a brief account of the history and character of
the specimen now exhibited. It was originally about two
and a half inches long and two inches thick, irregularly
angular in shape. The colour is a dark olive-green, but a
weathered face is bright blue ; the fracture is conchoidal.
This specimen was obtained by me many years ago from a
heap of basalt and scoriae, excavated from a temporary road-cutting
on the right bank of the Derwent between Macquarie
Plains and Fenton Forest. Near the same spot I found, on
a block of basalt, thin bands of a dull black glass, bearing
some resemblance to the glassy selvages of basalt dykes,
which have often been described as constituting the chief
sources of obsidian and basalt-glass. The basalt of this part
of the district is probably of late tertiary age. Includes woodcut of Volcanic Bomb

Item Type:	Article
Authors/Creators:	Stephens, Thomas
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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