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stephens-notes-basalt-glass-1897.pdf (422.32 kB)

Notes on a specimen of Basalt-glass (Tachylyte) from near Macquarie plains Tasmania, with remarks on Obsidian " Buttons."

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posted on 2023-11-22, 09:18 authored by Thomas Stephens
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

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Papers & Proceedings of the Royal Society of Tasmania

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54-58

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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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