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greisenaplitegranophyreI-type graniterapakiviS-type granitefelsic and mafic rocksintrusive rockrhyolitediabasegabbroanorthositenepheline syeniteperidotitepicritelamprophyresyenitedacite
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![](https://cdn.statically.io/img/cdn.britannica.com/mendel-resources/3-121/images/shared/default3.png?v=3.121.12)
Hans Cloos
German geologist
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Herbert Harold Read
British geologist
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