bergmeal

Wiktionary

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

GNU Webster's 1913

1. n. (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.