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For scientific support in your conservation and restoration work on historic buildings, please contact the laboratory of the Bern Cathedral Foundation (http://www.bernermuensterstiftung.ch/aktuell/aktuell.php)

Partly burnt quartz in a lime lump of a Middle Age mortar, with a binder burnt out of Kieselkalk.

Orange = quartz, blue to violet = reaction products of quartz and lime, beige = binde­r. Transmitted light, crossed polarization and λ-plate.