自形晶（euhedral crystal）是矿物晶体在岩石（岩浆岩）中发育程度的一类，一般是在岩浆结晶早期阶段的产物。
... 自形粒状结构：automorphic granulartexture 自形晶：automorphic crystal 自形结晶：euhedral crystal ...
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... euhedral 全形的; 自形的 euhedral crystal 自形晶 euhedral-granular texture 自形晶粒状结构 ...
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这些绿帘石呈自形晶，普遍发育熔蚀结构，部分具褐帘石核。
Most of these epidotes are idiomorphic, and they are featured frequently with melting corrosion structure and occasionally with allanite-rich cores.
扫描电镜观察发现，重晶石均为完整自形晶，并与同为自形的石英及钠长石共生。
Under scanning electron microscope, barite in these samples occurs as euhedral crystal, co-existing with authigenic quartz and albite with the same idiomorph.
晶间孔隙主要发育在陡一段下部的粗粉晶含灰云岩中，白云石晶体为自形晶和半自形晶。
The former are mainly developed in the coarsesilt grained, euhedral and semi-euhedral crystalline calcitic dolomites occurring in the lower part of the first member of the Doushantuo Formation.
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