The vivianite occurs in dark brown and dark gray beds of glacial silt and clay. |
The quarry has yielded fine specimens of eosphorite, fairfieldite, montebrasite, roscherite, and vivianite. |
The vivianite occurs in small earthy-blue masses perched on fragments of fossil wood. |
Alteration of this mineral has produced an unusual abundance of vivianite coatings on fracture surfaces in the rock. |
Occurrences of gypsum crystals and vivianite in drift are also noteworthy. |
This polished section of a tooth crown reveals figure-eight patterns of the blue mineral vivianite, a phosphate of iron. |