English to Russian Science Mining & Minerals / Gems MINERALOGICAL REPORT

Петрографическое исследование образцов горных пород, предположительно опалов.

INTRODUCTION

Mr ... delivered two rock samples to ... . Macrophotos of these are presented on the next page. Macroscopically, these were seen to represent weathered surface rock outcrop.

The request from ... was for the preparation of a thin section through nominated areas in these rocks of homogeneous, *** massive ultrafine and extremely dense-siliceous material *** incorporated within a matrix of silicified poorly sorted quartz sandstone. The thin sections were then examined by petrological microscope, optical transmitted light and described together with by selected photomicrographs.