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Named in reference to the composition as the barium analogue of the mineral pharmacoalumite. It is a rare mineral that occurs at the type locality at the Cap Garonne mine near Var in France, as well as in the La Gande mine in Coquimbo, Chile, among a couple other localities. It appears at the type locality as pale yellow cubes that are interpenetrating.

Ref. Mills, S. J. et al. and Mineralogical Magazine February 2011 v. 75 no. 1 p. 135-144

Sometimes also called Barium-pharmacosiderite, this mineral is named in reference to the composition which is barium-dominant,and for the relation to pharmacosiderite. Localities include in the Tintic ore district in Utah, and at Sterling Hill in New Jersey and in the Burrus mine in Nevada, USA, at the type locality in the Clara mine and other German localities including in the Schwarzwald Mountains, and Aschaffenberg in Bavaria. It can be found in association with arsenopyrite in tourmaline at Zablaticko, and in Tertiary sandstone in Kralovske Porici in the Czech Republic.

Ref. Minerals and their Localities, Bernard, J.H. and Hyršl, J. (2004)

IMA/CNMNC List of Mineral Names (2009) and Mineralogical Record 39 (2008), 131

There is no mention of the etymology of the name of this mineral. Barroisite is a rare mineral that occues in blueschist facies metamorphic rocks. Localities include in the USA, Wales, and Norway among only a few others. Associated minerals include omphacite, glaucophane, crosstie, actinolite, and calcite.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/barroisite.pdf