la·pil·lus (l -p l s)n. pl. la·pil·li (-p l  ) A small, solidified fragment of lava. [Latin, diminutive of lapis, stone.] |
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Lapilli |
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The country rocks consisting of sandstones and siltstones disaggregate to form quartz rich lapilli tuffs. 3 gpt were intersected in zones from 4m to 18m wide in vuggy silica and quartz-alunite alteration in fragments in pyroclastic breccias and lapilli breccias. lapilli tuff, 10-20% Py(Cp) with veinlets of locally massive Py-Cp(Po)+/-Qz including 2,356. |
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