Porphyry and Hyaloclastite Types and Facts
Types
Rhomb Porphyry
Welded tuff, Rhyolitic tuff, Basaltic tuff, Trachyte tuff and Andesitic tuff.
Features
Generally rough to touch, Is one of the oldest rock, Surfaces are often shiny
Always found as volcanic pipes over deep continental crust
Archaeological Significance
Famous Monuments
Data Not Available
Data Not Available
Famous Sculptures
Data Not Available
Data Not Available
Pictographs
Not Used
Used
Petroglyphs
Not Used
Used
Types of Porphyry and Hyaloclastite
Some rocks according to their use or texture are classified into different types. Know more about Porphyry Texture and Hyaloclastite Texture. Types of Porphyry are Rhomb Porphyry whereas the types of Hyaloclastite are Welded tuff, Rhyolitic tuff, Basaltic tuff, Trachyte tuff and Andesitic tuff..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. Porphyry was not used to create pictographs whereas Hyaloclastite is used to create 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. Porphyry was not used to create petroglyphs whereas Hyaloclastite was used to create petroglyphs.