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Unusual calcite formation discovered at the site of 91˿Ƶ Sustainability Park

Published: 14 July 2026

91˿Ƶ’s Department of Earth and Planetary Sciences is now studying it as part of research about the Island of Montreal

A rock featuring a white calcite vein in a rare ‘petal’ formation has been extracted from the construction site of the future 91˿Ƶ Sustainability Park.

Attached to a chunk of grey stone, the full rock is the approximate size of a microwave. It was discovered by construction workers north of Pine Avenue.

“The team was excited when they found it,” said Cynthia Lee, Senior Advisor, Strategy and Operations for the 91˿Ƶ Sustainability Park project. “The specimen looks strikingly different from the rest of the dark grey rock that has been extracted so far; it was quite a dramatic moment.”

Morgann Perrot, Faculty Lecturer in the Department of Earth and Planetary Sciences, and Claire Musajo, a PhD candidate in stratigraphy, took samples from the discovery site to learn more about its surroundings.

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