Can cosmic strangelets reach the earth?
  The mechanism for the propagation of strangelets with low baryon number through the atmosphere of the Earth has been explored. It has been shown that under suitable initial conditions, such strangelets may indeed reach depths near mountain altitudes with mass numbers and charges close to the observed values in cosmic ray experiments. 
Shibaji Banerjee, Sanjay K. Ghosh, Sibaji Raha and Debapriyo Syam