Do you have any proper assays?
I think you got the heat transfer backwards. Silver and gold lose heat faster than iron as it is such a good heat conductor.
Heating up rocks and throw them in water isn't telling you much about what they are made from, except the majority of the rock.
What makes you believe this is chlorargyrite? What tests have you done?
By the way, it should be "sulfides", not "sulfites", that's two different chemical classes. Spelling is important.
Göran