Abstract

Sursassite, previously known only from Oberhalbstein, Graubunden, Switzerland, occurs in veinlets cutting Middle Silurian Fe-Mn ores about 5 mi W. of Woodstock, New Brunswick. The composition based on a new analysis is Mn 9 Al 4 (Si,Al) 12 O 39 .6H 2 O. Associated minerals are barite, calcite, and quartz, and the veins appear to have been formed near the end of a period of low-grade metamorphism, by solutions operating under the intensity environment of the greenschist facies.

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