| They usually consist of a very thin opal slice sandwiched between a glass or quartz top and a potch, basanite, jade, or black onyx bottom. |
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| Small basanite intrusions in the Batain area of NE Oman have been noted by a number of workers. |
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| The composition studied has very low albite and is classified as transitional between olivine nephelinite and nepheline-rich basanite. |
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| This glass is compositionally similar to groundmass glass in the host basanite. |
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| During this period volcanic activities continued locally, represented by analcite bearing basanite and andesites. |
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