Is cobalt hard?

It is soft in nature . Because of its dramatic color change and the ease of the hydration/dehydration reaction, "cobalt chloride" is used as an indicator for water in desiccants.
Its formula is CoCl2.6H2O
from: Shilo Kim Johnson

Read more: http://wiki.answers.com/Q/Is_cobalt_chloride_hard_or_soft#ixzz1tHuItauu