Siderite ps. After Aegirine (rare)

Item Description

A rare pristine pseudomorph from the famous Poudrette Quarry. A terminated, euhedral, six-sided, aegirine crystal has been pseudomorphed by tiny, brown, siderite rhombs. A copy of the accompanying label indicates, that this is a pseudo after serandite, but we believe it is aegirine. Either way, a rare and desirable Mont Saint-Hilaire pseudomorph.