1911 Encyclopædia Britannica Variolites: Revision history

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13 September 2025

  • curprev 04:2704:27, 13 September 2025JerriStringfield talk contribs 6,396 bytes +6,396 Created page with "<br>Other variolites are glassy or partly crystalline facies of olivine-free dolerites, occurring as thin dikes or intrusions, or at the margins of dolerite masses. In these the felspars are well crystallized as thin rods, with square or forked ends, radiating outwards from a centre. They are commonly oligoclase, and sometimes assume branching or feathery forms. Some authors would call these "sphaero-crystals" rather than spherulites; they are an intermediate stage betwe..."