Spherulite

Webster's Revised Unabridged Dictionary
- n Spherulite (Min) A minute spherical crystalline body having a radiated structure, observed in some vitreous volcanic rocks, as obsidian and pearlstone.
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Century Dictionary and Cyclopedia

- n spherulite A vitreous globule, such as those of which perlite is made up, having a more or loss perfectly developed concentric and at the same time decidedly radiating fibrous structure. The highly silicious volcanic rocks not unfrequently have a spherulitic structure.
- n spherulite Same as radiolite, 2.
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Chambers's Twentieth Century Dictionary

- Spherulite a radiating spherical group of minute acicular crystals common in silicious volcanic rocks
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Webster's Revised Unabridged Dictionary

Cf. F. sphérulite,

Chambers's Twentieth Century Dictionary

Fr.,—L. sphæra—Gr. sphaira.

Occasionally they show a fluxional banding; they may also be spherulitic or vesicular.

"Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 2" by Various

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Definitions