| Porcelaneous datolite occurred in the amygdaloidal lodes as veins, vesicle filling, and nodules. |
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| These minerals occur in amygdaloidal cavities and in nodules in intermediate composition volcanic rocks of the Conejos Formation. |
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| These crystals occur in amygdaloidal cavities, either as massive fillings or as linings of trapezohedral crystals that rarely exceed 1 cm across. |
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| It can be found in fissure veins and brecciated amygdaloidal basalt lodes but not in the conglomerate lodes. |
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| The various types of medium depth aquifers include massive basalt, amygdaloidal basalt, trachyte, pyroclastics and tuffs. |
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| Only andesitic tuffs have phenocrysts, amygdaloidal structures, and slight flow structures. |
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| In the northern parts of the Thane Creek amygdaloidal basalt occurs as the medium depth aquifer. |
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| Marine landforms encounter massive or amygdaloidal basalts soon after the top soil. |
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| The area mainly comprises compact and amygdaloidal basalt with weak planes of red bole. |
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| The jointed and fractured zones are seen more commonly in amygdaloidal basalt than compact basalt. |
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| Mineralogically, the conglomerate lodes have produced many superb specimens, although they contain fewer mineral species than the fissure veins and amygdaloidal lodes. |
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| Many of the volcanic rocks are amygdaloidal and in places are cut by more massive dykes. |
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| Mafic rocks include massive to very amygdaloidal, locally porphyritic, fine-grained maroon or dark greenish grey basalt, and extensive belts of ash and lapilli tuff. |
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| The study area is geologically covered by Deccan trap rocks from the Cretaceous to the lower Eocene age, consisting of amygdaloidal and vesicular basalts. |
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| Amygdaloidal cavities are located immediately below the uppermost scoriaceous part of the second flow, near its contact with the overlying flow. |
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