This particular one apparently came from the summit of Mount Edith Cavell, which was above the glaciers, near Jasper Alberta, a distance of about 350 km as the crow flies. It is pure quartzite, as is Mount Edith Cavell.
It was quite cold, minus 13C, with a breeze and I had fun other than freezing my fingers. They are tender as I type this.
For those of you who live in western Canada, Big Rock Beer, a great brew IMO, is named after this.
In this and the following, you can see the main ranges of the Rockies in the background.
This is a detail that I converted to Black and White