Moreover , in tourmaline the dichroism is strongly marked , whereas in jargoon it is remarkably feeble .
Jargoon and tourmaline , when cut as gems , are sometimes mistaken for each other , but the specific gravity is distinctive , since that of tourmaline is only 3.103 .
In tourmaline the dichroism is strongly marked , whereas in jargoon it is remarkably feeble .
Jargoon and tourmaline , when cut as gems , are sometimes mistaken for each other , but the specific gravity is distinctive , since that of tourmaline is only 3.103 .