What’s found in central Bolivia — one new mineral (7)
I believe the answer is:
olivine
'mineral' is the definition.
(type of mineral)
'what's found in central bolivia one new' is the wordplay.
'what's found in' indicates putting letters inside.
'central' indicates the central letters.
'one' becomes 'e' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
The middle letters of 'bolivia' are 'olivi'.
'olivi'+'e'='olivie'
'olivie' placed around 'n' is 'OLIVINE'.
(Other definitions for olivine that I've seen before include "Clear green gemstone" , "mineral in rock" , "stone" , "Dark green mineral" .)