| 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.
|
