Whinstone
Whinstone is a term used in the quarrying industry to describe any hard dark-coloured rock. Examples include the igneous rocks, basalt and dolerite, as well as the sedimentary rock, chert.[1]
Description
Massive outcrops of whinstone occur include the Pentland Hills, Scotland and the Whin Sills, England.
The name 'whin' derives from the sound it makes when struck with a hammer. It is used for road chippings and dry stone walls, but its natural angular shapes do not fit together well and are not easy to build with, and its hardness makes it a difficult material to work. A common use is in the laying of patios and driveways in its ground/by product state called Whindust.
gollark: Inertial guidance or whatever probably less so, at the accelerations it'd have to deal with.
gollark: Accurate orbital prediction is as far as I know basically a solved problem, GPS relies on it.
gollark: True, true.
gollark: You don't really need to *destroy* the incoming rod as much as deflect it a few degrees though, no?
gollark: They radiate tons of heat and you can perfectly predict their orbital path given previous knowledge of it.
References
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