Syenite is a potassium feldspar-rich, quartz-poor, coarsely-crystalline (phaneritic), intrusive igneous rock. Other minerals occur with the feldspar, such as dark-colored pyroxene and amphibole, and often nepheline.

Yooperlite is a sodalite-bearing syenite. Sodalite is a feldspathoid mineral having the chemical formula Na4(Al3Si3)O12Cl - sodium chloro-aluminosilicate. It is often bluish-colored (see: www.flickr.com/photos/jsjgeology/albums/72157714493738277), but in yooperlite, it's light- to grayish-colored. Under ultraviolet light (black light), the sodalite in yooperlite rocks glows bright orange.

Published research (Lauglin et al., 2018) indicates that yooperlites can be sourced to the Coldwell Alkaline Complex, along the northern Lake Superior shoreline in Ontario. The Coldwell Complex includes sodalite syenites having orange-fluoresceing hackmanite, a variety of sodalite. Pleistocene glaciers likely eroded Coldwell Complex rocks and deposited them on the American side of Lake Superior.

Fluorescence occurs as a result of short-wavelength UV radiation, long-wavelength UV radiation, or x-rays bombarding atoms. This causes electron excitation, but the electrons do not remain in an energetically excited state. They quickly give off energy and resume their normal energy levels. If the electron energy release is in the visible spectrum of light, a mineral glows, or fluoresces.

Geologic provenance: likely center 2 of Ontario's Coldwell Alkaline Complex, late Mesoproterozoic, 1.108 Ga

Locality: unrecorded/undisclosed site along the southern shore of Lake Superior, Upper Peninsula of Michigan, USA

Na 8(Al 6Si 6O 24)Cl

Metaphysical Healers say yooperlite is a stone of truth and allowing to recognize and express objectively his feelings.

Yooperlite releases anger and negative thoughts and helps fight your fears and phobias. It creates a clear and perceptive mind, able to find inner peace. Yooperlite stimulates self-acceptance and self-confidence.