Definition
Borolanite is a variety of Nepheline Syenite and belongs to igneous rocks and contains nepheline-alkali feldspar pseudomorphs which occur as conspicuous white spots in the dark rock matrix
Gritstone or grit is a hard, coarse-grained, siliceous sandstone
History
Origin
Scotland
Pennines, England
Discoverer
Unknown
J.J. Ferber
Etymology
From Alkalic Igneous complex near Loch Borralan in northwest Scotland
From Grit + Stone
Class
Igneous Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Medium Hardness Rock
Durable Rock, Hard Rock
Family
Group
Plutonic
-
Other Categories
Fine Grained Rock, Opaque Rock
Coarse Grained Rock, Opaque Rock