RM030 Mylonite

Class: 5E (18)
Name: Kristal Mak
Year: 2017 – 2018
地質年代:(化石) (岩石)

化學組成, 鍵及結構:(礦物)

Geological Age: (Fossil) (Rock)

Chemical composition, bonding and structure: (Mineral)




Mylonites are ductilely deformed rocks formed by the accumulation of large shear strain during folding and faulting, in ductile fault zones. This process involves nearly complete pulverisation of the parent rock so the original minerals are almost completely broken down and recrystallise as smaller grains which are tightly intergrown, forming a dense, hard rock.




The texture of Mylonite is foliated. It is fine grained; grains need to be observed under a microscope; sometimes contains porphyroblasts. It is very hard. Also the color is variable, grey to black, but can form in a variety of colours dependent on parent rock composition. It is extremely variable, dependent on the original composition of the parent rock and generally smooth to touch.

用途:(岩石) (礦物)



Application: (Rock) (Mineral)

Mylonite are used for various purposes starting from construction of roads, bridges, buildings to pot in kitchen, as a gem stone or just for decorating your garden. Mylonite uses in construction industry include for road aggregate, Landscaping, Roadstone. Mylonite rock is not yet used in the medical industry.

分佈:(岩石) (礦物)



It deposits in Eastern Continents, for example China, India, Indonesia, Saudi Arabia, South Korea in Asia, Ethiopia, Ghana in Africa, and England, Finland, France, Germany in Europe. Also, there are deposits in Western continents, like USA. For Oceania Continent, central and western Australia, Mylonite can also be found.


“Mylonlite”一詞來自希臘mulōn mill。 

More to learn:

The word ‘Mylonlite’ is from Greek mulōn mill.