Specific gravity: 3.15
Colour: Colourless or white, colourless in transmitted light
Solubility: Slightly soluble in water. Decomposed by concentrated sulphuric acid
Sellaite occurs in evaporites, volcanic ejecta and fumeroles, marble,
magnesite and alkalic granite.
Anhydrite, gypsum and
sulphur are common associates
At the Pedra Preta pit, Serra das Éguas, Brumado, Bahia, Brazil, sellaite occurs in vugs associated with magnesite and quartz (Dana).
At the type locality, the Gébroulaz glacier, Val Thorens, Saint-Martin-de-Belleville, Les Belleville, Albertville, Savoie, Auvergne-Rhône-Alpes, France, sellaite occurs in bituminous dolomite-anhydrite rock in a glacial moraine (Dana). Associated minerals include fluorite, anhydrite, dolomite, celestine, quartz and sulphur (Mindat).
At Carrara, Massa-Carrara Province, Tuscany, Italy, sellaite occurs in cavities in marble (Dana).
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