Specific gravity: 4.28
Solubility: Readily soluble in hydrochloric and hyfrofluoric acids but less reactive in other acids
Hulsite occurs very rarely in a contact metamorphosed
limestone, close by a granite intrusion,
associated with calcite, vesuvianite,
fluorite and diopside
At the type locality, Brooks Mountain, Seward Peninsula, Nome Census Area, Alaska, USA, hulsite occurs in contact metamorphosed limestone associated with vesuvianite, magnetite, garnet and diopside (Mindat).
Hulsite alters to limonite (Mindat).
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