Vein minerals were once dissolved in fluid. true or false?

True

Explanation:

The vein minerals are formed from the saturated hydrothermal fluids or the magma fluid that is formed in the existing rocks in its fissures after continuous and subsequent cooling.  

Basically the process of formation of vein mineral is as follows –  

a) Magma heats the underground solutions  water  

b) Production of solutions when elements & compounds dissolve in hot water

c) These solutions then flow to the cracks

d) Elements & compounds cool down and crystallize as minerals  

Thus it can be said that Vein minerals were once dissolved in fluid

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