The final form of ferruginous body (Type D) was not confused with the other elongated forms of ferruginous bodies that occur on fibrous cores because the material comprising the cores in these entities were plates or "flake-like" structures, and often displayed a yellowish dark golden coloration.
The rare occurrence of a nonelongated ferruginous body in this case differs from our findings of their common occurrence in samples from workers from another East Texas foundry (3).
Ferruginous body formation on a nonasbestos mineral.
There was one Type D ferruginous body which we determined was formed on aluminum silicates (Figure 10).
The second form of ferruginous body as defined by light microscopy had as its core a thin black filament determined by electron microscopy to be composed of amorphic organic material (Type B).
There was one ferruginous body found by light microscopy, formed on a "flake-like" or plate material which had varying degrees of ferruginous deposits along its periphery.
There was a mixture of ferruginous body (FB) types found on the slides (Table 1).