  A new and inexpensive technique for detecting self interacting dark matter in
the form of small grains in bulk matter is proposed. Depending on the
interactions with ordinary matter, dark matter grains in bulk matter may be
isolated by using a centrifuge and using ordinary matter as a filter. The case
of mirror matter interacting with ordinary matter via photon-mirror photon
kinetic mixing provides a concrete example of this type of dark matter
candidate.
