What is "bergmeal"

Bergmeal \Berg"meal\, n. [G. berg mountain + mehl meal.] (Min.) An earthy substance, resembling fine flour. It is composed of the shells of infusoria, and in Lapland and Sweden is sometimes eaten, mixed with flour or ground birch bark, in times of scarcity. This name is also given to a white powdery variety of calcite.

n. 1 (context mineralogy English) An earthy substance, resembling fine flour, composed of the shells of infusoria. 2 (context mineralogy English) A white powdery variety of calcite.