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Both are
different und must not be mixed. They are easy to separate by
texture of the ovids (in rapakivis) and the orbicules (in orbicular
rocks).
First: Rapakivi with viborgitic
texture (ovoids with a rim of plagioclase),

Boulder of Rapakivi from
Åland. (The islands of Åland
are located between Sweden and Finland)
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Below:
Rapakivi with pyterlitic texture. (Ovoids
without
a rim of
plagioclase. Instead
euhedral or subeuhedral quartz crystals around the K-feldspars.)

Pyterlitic Rapakivi from Kotka, Finland |
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