The Baltic amber or succinite is found as irregular nodules in a marine glauconitic sand, known as "blue earth," occurring in the Lower Oligocene strata of Samland in East Prussia, where it is now systematically mined.
The nodules from the "blue earth" have to be freed from matrix and divested of their opaque crust, which can be done in revolving barrels containing sand and water.
Beckerite, a rare amber in earthy-brown nodules, almost opaque, said to be related in properties to gutta-percha.
The nodules are penetrated by cracks,;but the material can be worked on the lathe.
The nodules, in particular, appear to play the important part in the process.
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