posted on Jul, 29 2008 @ 06:51 PM
If you read the second site, the archae one it talks about how the material is especially suited for making such a bizarre thing.
Well here is the relevant passage from the website
In the past, some Egyptologists have use the term "schist" to describe this artifact (Emery 1949, Aldred 1981); others have identified the object as
a slate (Smith 1981). The term schist was not being used in a modern geologic context (i.e. a medium- to coarse-grained foliated metamorphic rock),
but was being used to describe a metasedimentary rock called a metasiltstone. This rock is essentially the sedimentary rock siltstone that has been
very weakly metamorphosed.
It still retains its clastic sedimentary texture and has no visible schistosity. Metasiltstone is similar to slate, but is more coarse-grained and has
no fissisity or slaty cleavage, making it a solid rock that does not easily fracture along discreet planes when struck. The weak metamorphism of
siltstone indurates the rock and increases the cohesiveness of the mineral grains (i.e. rock hardness), making the rock less susceptible to fracture
This allows for fine detail and intricate shapes to be carved into vessels, statues, palettes, and other such objects. Metasiltstone as a material for
vessel manufacturing came into use during the middle Predynastic and was used extensively during the Early Dynastic Period (Aston 1994).
Besides the tri-lobed bowl there are a number of intricately carved metasiltstone objects known from the Early Dynastic, such as a very ornate toilet
tray (Fig. 8), flower-shaped vessels (e.g. 1st Dynasty, UC37063 -
Note: identified as greywacke but more likely metasiltstone, metagreywacke was not used until the Old Kingdom and not for vessels (Nicholson & Shaw
2000) -, vessels shaped as leaves (e.g. 1st - 2nd Dynasty, UC35653), vessels shaped to imitate basket-work (e.g. 1st - 2nd Dynasty, UC35654), vessels
shaped as hieroglyphic symbols (e.g. 1st Dynasty, libation dish), and even used to imitate metal vessels (e.g. a stone vessel with simulated
rivet-heads (Lauer 1976, pl. 109).
Many of these sophisticated and creative designs are unique to the Early Dynastic Period, showing a high degree of experimentation in artistic
expression during this time.