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Pegmatite

释义 Definition

伟晶岩：一种极粗粒的火成岩，通常在岩浆结晶的最后阶段形成，常见于花岗岩体系中，晶体往往大到肉眼可清晰辨认；常富集石英、长石、云母，并可能含有锂、铍、钽等稀有元素矿物。（也可泛指“含巨晶的岩石体/岩脉”。）

发音 Pronunciation (IPA)

/pmtat/

例句 Examples

Pegmatite often contains very large crystals.
伟晶岩常常含有非常巨大的晶体。

The geologists mapped a pegmatite dike because it can host rare minerals like spodumene and beryl.
地质学家绘制了那条伟晶岩岩脉的分布，因为它可能含有锂辉石、绿柱石等稀有矿物。

词源 Etymology

pegmatite 源自希腊语 pegma（意为“固定之物、凝结体/框架”），经由地质学术语发展而来，用来强调这种岩石中矿物彼此“嵌合、交错”以及常见的粗大晶体结构。该词在19世纪的地质学文献中逐渐定型并普及。

相关词 Related Words

文学作品示例 Literary Works

The Roadside Geology of North America（Halka Chronic 等，科普地质读物中常见该术语，用于介绍伟晶岩及其矿物资源）
Dana’s Manual of Mineralogy（James Dwight Dana，经典矿物学教材中常讨论与伟晶岩相关的矿物产出）
Encyclopaedia Britannica（百科条目与地质概述中常出现 pegmatite，用于解释其成因与资源意义）

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