Montroyalite
Montroyalite is an IMA-recognized mineral species in the carbonate class, with the chemical formula Sr₄Al₈(CO₃)₃(OH)₂₆·10H₂O.
Key properties: Mohs hardness 3.5; specific gravity 2.677; White streak; Dull luster; optically biaxial.
IMA symbol Mtyl, IMA status: approved, named in 1985.
Found in cavities in a silicocarbonate sill.
It is found associated with Albite, strontiodresserite, calcite, quartz, dawsonite, ankerite, fluorite, barite, strontianite, smythite, marcasite, pyrite, halloysite, doyleite.
The name refers to the Monteregian Hill, Mont Royal, prominent landmark in Montreal, Canada, from which the city’s name was derived.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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