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Thundereggs are small spheroidal chalcedony bodies about 3 inches in diameter with a cauliflower-like surface crossed by low ridges. Most thundereggs consist of an outer shell of pale-brown aphanitic rock that is composed of volcanic glass shards, fine ash, and collapsed pumice lapilli; all of which are altered to radially oriented sheaves of fibrous cristobalite and alkali feldspar.

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Thundereggs

  • 章节

  • 发表日期：

    2025年

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  • Andrejs Zarins

摘要

Thundereggs are small spheroidal chalcedony bodies about 3 inches in diameter with a cauliflower-like surface crossed by low ridges. Most thundereggs consist of an outer shell of pale-brown aphanitic rock that is composed of volcanic glass shards, fine ash, and collapsed pumice lapilli; all of which are altered to radially oriented sheaves of fibrous cristobalite and alkali feldspar.