Take a look at this beautul magnesite specimen.
Notice the typical colors of the magnesium, white, brown, grey, almost a dolomite i'd say.
Good colorations.
How many times...
have others expressed the same colors when speaking of magnesite or dolomites ?
Many times.
Yet, would you bleeive that this speciment also has - NICKEL ?
It does.
The other photos in -
link -
shows an olivine near serpentine carbonate magnesite.
Eyes wide open... those colors in magnesite and dolos - means other minerals .
Appears it's a mix of - crystaline, pyrites, mica, influence.
Let's do another bulk test...using other ore geology. ( dolos or other ugly ores nearby )
Preferrably with lots of mica, irons, pyrites - etc...
I'll let the junior keep the magnesite in pilot plant.
I'll keep the remaining - unwanted ore - sift thorugh them... wink.
https://www.mindat.org/min-27272.html 
Cheers...