Which preposition to use with matrix

of Occurrences 9%

The Latin and Greek he understood critically; the oriental languages, which never were vernacular in this part of the world, he thought the use of them would not answer the time and pains of learning them; yet had so great a veneration for the matrix of them, viz.

in Occurrences 4%

Doctor Kerr had been guided to the spot by an aboriginal who had been in his service several years; and, in his excitement, he broke the matrix in which the nugget was imbedded, and thus spoiled what would have been the most magnificent specimen of gold quartz hitherto discovered.

with Occurrences 1%

Examine the matrix with curled elastic fiber mixed with straight white fibers.

Which preposition to use with  matrix