1911 Encyclopædia Britannica Variolites: Revision history

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13 September 2025

7 September 2025

  • curprev 01:1201:12, 7 September 2025‎ TeraBdp636 talk contribs‎ 6,307 bytes +6,307‎ Created page with "<br>Other variolites are glassy or partly crystalline facies of olivine-free dolerites, [https://www.nuwireinvestor.com/?s=occurring 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 sph..."
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