41. This rock appears pink, red, green or grey, with medium-sized phenocrysts . 42. The primary crystallized and fast crystallized calcites form phenocrysts and fine-grained groundmass, respectively. 43. Older pyroclastics from the same centre contain phenocrysts of clinopyroxene, olivine, orthopyroxene and plagioclase. 44. First, they are completely glassy and lack any microlites or phenocrysts , unlike terrestrial volcanic glasses. 45. For example, porphyritic andesite will have large phenocrysts of plagioclase in a fine-grained matrix. 46. The largest crystals found in some pegmatites are often phenocrysts being significantly larger than the other minerals. 47. Hence, the shape of phenocrysts can provide valuable information on cooling rate and initial magma temperature. 48. These phenocrysts transfer life-giving sunlight to the lower worlds and people too with erresdy powder. 49. The result is an aphanitic rock with some larger crystals ( phenocrysts ) imbedded within its matrix. 50. Phenocrysts include plagioclase in andesite with smaller amounts of amphibole, biotite, clinopyroxene, and orthopyroxene.
