Anthracite and Siltstone Types and Facts
Types
Semi-anthracite and Meta-anthracite
Siltstone
Features
Helps in production of Heat and Electricity, Used as fossil fuel
Available in Lots of Colors and Patterns, Easily splits into thin plates, Generally rough to touch, High silica content, Very fine grained rock
Archaeological Significance
Types of Anthracite and Siltstone
Some rocks according to their use or texture are classified into different types. Know more about Anthracite Texture and Siltstone Texture. Types of Anthracite are Semi-anthracite and Meta-anthracite whereas the types of Siltstone are Siltstone.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. Anthracite and Siltstone 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. Anthracite and Siltstone were for creating petroglyphs.