Does every metal have a Feruchemical and Hemalurgic property? If not, are there metals which have Feruchemical or Hemalurgic properties which do not have Allomantic ones?
Every metal has a Feruchemical, an Allomantic, and a Hemalurgic property. The godly metals each also do something else. There are several interesting Feruchemical powers yet to be discovered and revealed in the next series. Feruchemy is less widely understood because there were so few practitioners in the modern era, and a lot of the time they were too afraid of capture to really study and use their powers.
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