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microspherulitic
microspherulitic adj. 
/ˌmaɪkroʊˌsfɛr(j)əˈlɪdɪk/ Geology (of a rock) characterized by the presence of microscopic spherulites.
Brit. /ˌmʌɪkrə(ʊ)sfɛrjᵿˈlɪtɪk/
, /ˌmʌɪkrə(ʊ)sfɛrjᵿˈlɪtɪk/U.S. /ˌmaɪkroʊˌsfɪr(j)əˈlɪdɪk/
, /ˌmaɪkroʊˌsfɪr(j)əˈlɪdɪk//ˌmaɪkroʊˌsfɛr(j)əˈlɪdɪk/ΚΠ
1885 A. Geikie Text-bk. Geol. (ed. 2) 111 In many cases spherulites are only recognisable with the microscope, when they each present a black cross between crossed Nicol~prisms, and thereby characteristically reveal the micro~spherulitic structure.
1895 A. Harker Petrol. xi. 138 The very minute spherulites commonly occur in large numbers, closely packed together... This is the microspherulitic structure.
1965 G. J. Williams Econ. Geol. N.Z. viii. 91 (table) Flow banded micro~spherulitic pink-grey rhyolite.
1990 Jrnl. Volcanol. & Geothermal Res. 43 57 Pantellerite lavas of the dormant caldera volcano, Mayor Island, New Zealand, have thick non-hydrated obsidian selvages at the tops and bases, and crystalline, microspherulitic interiors.
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