31. Both of these minerals are indicative of fairly high grade metamorphic alteration. 32. The primary rocks are metamorphic , mostly quartzites and slate. 33. For metamorphic rocks, there are certain principles for measuring the decrepitations. 34. Metamorphic and sedimentary rock underlie the parent material of the Blandford series.35. The metamorphic conditions of the country rocks reached medium and high grade. 36. A metamorphic zone is the region between two such easily recognizable isograds. 37. The metamorphic zones in these lithologies can also be different. 38. Oliver serves as an advisor to TodayTix and Metamorphic Ventures. 39. Richterite occurs in thermally metamorphosed limestones in contact metamorphic zones. 40. It occurs in retrograde metamorphic environment as fractures cutting garnet diopside skarn.
