31. For example, slate is a foliated metamorphic rock , originating from shale. 32. The Cecil series developed over igneous metamorphic rock which is chemically similar to granite. 33. Crag Mountain is composed of quartzite, a weather-resistant metamorphic rock . 34. The Alaska Empire underground lode mine recovered gold from quartz veins in metamorphic rocks . 35. Jadeite is formed in metamorphic rocks under high pressure and relatively low temperature conditions. 36. In areas are metamorphic rocks Palaeozoic granitic and igneous intrusions. 37. Hard metamorphic rocks are usually placed by waterfalls or streams. 38. In metamorphic rocks , crystals similar to phenocrysts are called porphyroblasts. 39. Characteristic is the appearance of various igneous and metamorphic rocks in interesting structural relationships. 40. Most of these mountains are volcanic in origin although the nucleus is metamorphic rock .
