The evaluation of the compositional variation in a single rock suite revealed by grid sampling

Abstract

We collected rock samples from Inada granite, Kasama city, Ibaraki prefecture in order to evaluate the
variance of chemical compositions in the single rock sample. The sample was subdivided into several
cubic samples with a weight of about 25g, and chemical composition of each cubis samples were analyzed.
As a result, wide compositional variations in a single rock sample such between 73 and 77 SiO₂ wt% were observeed.