Hilairite is one of the many new minerals to come from the famous mineral locality, Mont Saint-Hilaire, Quebec, Canada. Hilairite's crystals are small but generally well formed and they have an interesting brown color and a good luster. Its rarity and beauty as well as its ties to this wonderful site make this a great collection mineral if a specimen can be found.
The rocks at Mont Saint-Hilaire are unique because they are the result of an alkaline metal rich intrusion called an agpaitic pegmatite.
This pegmatite was also rich in traditionally rarer elements such as titanium, zirconium, cerium, barium and others.
Hilairite is certainly one of the minerals that typify this pegmatite having sodium (one of the alkali metals) and zirconium in its chemistry.
In fact there are several different minerals that are sodium zirconium silicates that are associated to hilairite.
These include the closely related
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