Ignimbrite and Nepheline Syenite Types and Facts
Types
Pyroclastic rock
Borolanite and Litchfieldite
Features
Always found as volcanic pipes over deep continental crust
Application of acids on the surface causes cloudy frosting, Available in Lots of Colors and Patterns, Dissolves in hydrochloric acid, Is one of the oldest rock
Archaeological Significance
Types of Ignimbrite and Nepheline Syenite
Some rocks according to their use or texture are classified into different types. Know more about Ignimbrite Texture and Nepheline Syenite Texture. Types of Ignimbrite are Pyroclastic rock whereas the types of Nepheline Syenite are Borolanite and Litchfieldite.During historic times, some rocks depending on their hardness were used to create Pictographs and Petroglyphs. Rocks which are hard were generally not used. Pictographs are paintings or drawings that have been placed or created on the surface of rock. Ignimbrite and Nepheline Syenite were for creating pictographs. Petroglyph is an image which is carved into a rock. These are images created by removing part of a rock surface by incising, picking, carving or abrading, as a form of rock art. Ignimbrite and Nepheline Syenite were for creating petroglyphs.