Sunday stone, a calendar in rock
Formed in a Tyneside coal mine in the 1800s, the white mineral barium sulphate, settled out in a water trough and during working shifts was blackened by coal dust. The resulting concretion formed a natural calendar, with a large white layer every Sunday when no work was taking place
Picture No
10706150
Media ID
47591127
Size
4724px x 3712px
(10.3MB)
Credit
Mary Evans / Natural History Museum
Source
Photograph from the Natural History Museum Collection
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Barium Calendar Limestone Mineral Sedimentary Sulfate Sulphate Wavy
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