  Quark nuggets are theoretical objects composed of approximately equal numbers
of up, down, and strange quarks and are also called strangelets and
nuclearites. They have been proposed as a candidate for dark matter, which
constitutes about 85% of the universe's mass and which has been a mystery for
decades. Previous efforts to detect quark nuggets assumed that the
nuclear-density core interacts directly with the surrounding matter so the
stopping power is minimal. Tatsumi found that quark nuggets could well exist as
a ferromagnetic liquid with an approximately 10 trillion Tesla magnetic field.
We find that the magnetic field produces a magnetopause with surrounding
plasma, as the earth's magnetic field produces a magnetopause with the solar
wind, and substantially increases their energy deposition rate in matter. We
use the magnetopause model to compute the energy deposition as a function of
quark-nugget mass and to analyze testing the quark-nugget hypothesis for dark
matter by observations in the air, water, and land. We conclude the water
option is most promising.
