Mineral, SrCO₃; sp. gr. 3.7; hardness 3.5–4.0; orthorhombic; white to pale green, grey, or pale yellow; white streak; vitreous lustre; crystals prismatic or acicular, but also fibrous and massive; cleavage prismatic, good {110}; occurs in low-temperature hydrothermal veins, often in limestone, and in association with celestite, barite, and calcite; soluble, with effervescence, in dilute hydrochloric acid. It is named after the type locality of Strontian, Highland Region, Scotland.