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Scapolite

The Silicate Minerals

From Andrew Alden, About.com

Scapolite is a mineral series with the formula (Na,Ca)4Al3(Al,Si)3Si6O24(Cl,CO3,SO4). It resembles feldspar but usually occurs in metamorphosed limestones.
Alkali aluminum silicate with carbonate/sulfate/chloridePhoto courtesy Stowarzyszenie Spirifer via Wikimedia Commons
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