| 释义 |
paramorphism
par·a·mor·phism P0062100 (păr′ə-môr′fĭz′əm)n. Structural alteration of a mineral without change of chemical composition.
par′a·mor′phic (-fĭk), par′a·mor′phous (-fəs) adj.paramorphism (ˌpærəˈmɔːˌfɪzəm) n (Minerals) a process by which the crystalline structure of a mineral alters without any change in its chemical composition
Paramorphism
paramorphism[¦par·ə′mȯr‚fiz·əm] (mineralogy) The property of a mineral whose internal structure has changed without change in composition or external form. Formerly known as allomorphism. Paramorphism a type of pseudomorphism that involves the polymorphous alteration of a high-temperature form of a mineral to a low-temperature form. With paramorphism there is a rearrangement in the crystalline structure of the mineral without a change in chemical composition; the external shape of the original crystal is also preserved. Examples of paramorphs are hexagonal α-quartz after trigonal β-quartz, rhombic sulfur after monoclinic sulfur, trigonal calcite after rhombic aragonite, and cubic pyrite after rhombic marcasite. |