Anhydrous normal carbonate, burbankite group
Specific gravity: 3.50 to 3.58
Hardness: 3½ to 4
Colour: Colourless, greyish yellow, pale yellow, pink, pale greenish
Solubility: Soluble in cold dilute hydrochloric acid
Plutonic igneous environments
Burbankite is typically an abundant accessory mineral in carbonatites, or in an intrusive alkalic
gabbro-syenite complex. It may
be authigenic (formed in place)
At Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Quebec, Canada, burbankite occurs embedded in analcime in pegmatite dikes, associated with microcline, aegirine, calcite, siderite and ancylite (Dana).
At the type locality, Vermiculite prospect No. 6, Big Sandy Creek, Bearpaw Mountains, Hill Co., Montana, USA, burbankite occurs with ancylite, calkinsite, lanthanite, calcite, biotite and baryte (HOM). The mineral deposits at the Vermiculite prospects occur in shonkinite, mafic monzonite and syenite (AM 38.1169-1183).
At Bear Lodge Mining District, Crook Co., Wyoming, USA, burbankite is authigenic and occurs with mckelveyite-ewaldite (Dana). It seems probable that burbankite was one of the last minerals to form, as it is never enclosed in any of the associated minerals (AM 62.158-163).
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