Mimetic crystal
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When a crystal has a higher degree of symmetry than the crystal system to which it belongs due to the development of twins, the crystal is called a pseudocrystal. For example, nepheline and cordierite belong to the orthorhombic crystal system, but due to the development of twins they have the appearance of a hexagonal crystal system. Pseudocrystals are generally easy to distinguish by examining their optical properties. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
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結晶が双晶の発達により，それ自身の属する晶系の対称より対称度を高め，高次の対称をもつように見える場合，その結晶を擬晶という。たとえば，霞石，菫青石は斜方晶系に属するが，双晶の発達により六方晶系の外見を示す。擬晶は一般に光学性を調べることにより，容易に判別される。
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