First discovered by Europeans in 1811 in the Ilimaussaq intrusive complex in Greenland, sodalite did not become widely important as an ornamental stone until 1891 when vast deposits of fine material were discovered in Ontario, Canada. Occurring typically in massive form, Sodalite is found as vein fillings in plutonic igneous rocks.

Crystals are rare but usually transparent to translucent. Sodalite is a member of the sodalite group with Hayne, nosean, lazurite and tugtupite.

A light, relatively hard yet fragile mineral, sodalite is named after its sodium content; in mineralogy it may be classed as a feldspathoid. Well known for its blue colour, sodalite may also be grey, yellow, green, or pink and is often mottled with white veins or patches. The more uniformly blue material is used in jewellery, where it is fashioned into cabochons and beads. Lesser material is more often seen as facing or inlay in various applications.

Although somewhat similar to lazurite and lapis lazuli, sodalite rarely contains pyrite (a common inclusion in lapis) and its blue colour is more like traditional royal blue rather than ultramarine. It is further distinguished from similar minerals by its white (rather than blue) streak. Sodalite's six directions of poor cleavage may be seen as incipient cracks running through the stone.

Most sodalite will fluoresce orange under ultraviolet light.

"Yooperlite" is a rockhound term for beach clasts of syenite containing orange-fluorescing sodalite. They are found along gravelly beaches of Lake Superior, principally along the northern shoreline of Michigan's Upper Peninsula (= "U.P." - people who live there are “Yoopers").

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, but in yooperlite, it's light- to grayish-colored. Under ultraviolet light (black light), the sodalite in yooperlite rocks glows bright orange.

Ref: Wikipedia

Metaphysical Healers call Sodalite "The Poet's Stone" in the crystal world, sodalite is most well known for its ability to help with communication in a lot of different ways, from helping one speak clearly and confidently to keeping one levelheaded in emotionally charged conversations.

Sodalite is a stone of insight and mental enhancement.

Sodalite enhances your mental capabilities and allows the natural contradictions of your mind to slowly weaken. 

Sodalite also assists in the development of one's intuition. 

Being able to be in such a calm and reflective state will assist in pulling out the negativity within.

It's also thought to help one to understand people more clearly and the understand the meaning behind their words so one can communicate more effectively with them. Sodalite can even increase group cooperation this way.

Sodalite is also great for enhancing your intuition, and can accurately interpret the guidance that you're receiving.

Because this Sodalite is considered great for communication it can also encourage truth, particularly when it comes to one speaking the truth.

Having good communication skills and strong intuition can help people move through the world with courage, so sodalite naturally helps boost confidence this way.

It can be a particularly helpful stone to have around when you're standing up for yourself or public speaking.

Sodalite is thought to facilitate a clear head. Along with keeping one calm and collected.

It also assists with absorbing new information and learning new things because of its ability to bring mental clarity.

Metaphysical Healers say Sodalite may stimulate latent creative abilities. Sodalite brings insights into the self and an honest evaluation of one’s motivations, strengths, weaknesses and patterns of destiny bringing an enlightened perspective on ones life.

YOOPERLITE

Yooperlite is a rockhound term for beach clasts of syenite containing orange-fluorescing sodalite. They are found along gravelly beaches of Lake Superior, principally along the northern shoreline of Michigan's Upper Peninsula (= "U.P." - people who live there are "Yoopers").

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, 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

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.