| 单词 | hornfels |
| 例句 | Stories, in that sly way, are his thing, and in his daily life he’s not averse to mussing around with geological terms like “hornfels” and “gneiss.” He Can’t Save His Daughter. Can He Save Himself? 2020-05-05T04:00:00Z In some cases, hornfels has visible crystals of minerals like biotite or andalusite. Physical Geology 2015-01-01T00:00:00Z Fine-grained shale and basalt, which happen to be chemically similar, characteristically recrystallize to produce hornfels. An Introduction to Geology 2017-01-01T00:00:00Z They are excessively variable in their mineralogical composition, and very often alternate in thin seams with biotite hornfels and indurated quartzites. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 6 "Home, Daniel" to "Hortensius, Quintus" 2012-03-15T02:00:32.250Z If the hornfels formed in a situation without directed pressure, then these minerals would be randomly orientated, not foliated as they would be if formed with directed pressure. Physical Geology 2015-01-01T00:00:00Z Metamorphic rocks formed in environments without strong directed pressure include hornfels, marble, and quartzite. Physical Geology 2015-01-01T00:00:00Z Some examples of non-foliated metamorphic rocks are marble, quartzite, and hornfels. Physical Geology 2015-01-01T00:00:00Z A third non-foliated rock is hornfels identified by its dense, fine-grained, hard, blocky or splintery texture composed of several silicate minerals. An Introduction to Geology 2017-01-01T00:00:00Z From diabases, basalts, andesites and other igneous rocks a third type of hornfels is produced. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 6 "Home, Daniel" to "Hortensius, Quintus" 2012-03-15T02:00:32.250Z Crystals in hornfels grow smaller with metamorphism and become so small that specialized study is required to identify them. An Introduction to Geology 2017-01-01T00:00:00Z |
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