Two types of epididymites have been found at Mont St. Hilaire. The first consists of euhedral crystals which are tapering pseudo-hexagonal prisms, most only a few millimeters long; all have a soft grayish-brown covering. The second type consists of radiating groups of translucent to transparent lath-shaped crystals, elongated parallel to the b-axis. X-ray powder diffraction data are tabulated.

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