I am currently in Mali (Sub-saharan Africa). This place has dust so fine, it covers everything. This time of year, the Harmattan winds bring the dust from the Saharan. The Hamattan can push dust all the way to South America. I have also seen dust matching Armstrong's description in Southwest Texas. I am not an geology expert, but it would seem to me that moon dust is made by pulverizing rock. I would think, there are many places on earth where you could can find rock close to lunar make up, ground down to lunar consistency.