Next, let's examine the mineral for any signs of cleavage. All minerals in this particular group should have readily visible cleavage. Usually it will be obvious but occasionally it will be more difficult to see. Also one of the minerals will fizz in HCl acid while the other one will not.

Three Directions not 90 degrees (fizzes in HCl)
Three Directions 90 degrees (does NOT fizz in HCl)
Four Directions (octahedral)