Pegmatites,which Often Occur in Dikes,are Unusual Among Shallow Intrusive Rocks

question 48

Multiple Choice

Pegmatites,which often occur in dikes,are unusual among shallow intrusive rocks in that they ________.

• A)possess porphyritic texture
• B)possess exceptionally coarse grains
• C)are mineralogically identical to the extrusive rock basalt
• D)are glassy,cooling so rapidly that crystals do not have time to form

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