Definition
Origin
Discoverer
Etymology
Class
Sub-Class
Group
Other Categories
Teschenite is coarse- to fine-grained, dark-coloured intrusive igneous rock that usually occurs in sills, dikes and irregular masses and is always altered to some extent
From its occurrence near Teschen. now known as Cieszyn, Pol., Scotland
Coarse Grained Rock, Opaque Rock
Rapakivi Granite is a hornblende-biotite Granite containing large rounded crystals of orthoclase which are mantled with oligoclase
From Finnish Rapakivi which stands for crumbly rock
Coarse Grained Rock, Opaque Rock