# Classification of rocks

A thematic map of the Atlas of Switzerland, the national atlas published by ETH Zurich. The map is drawn in the browser; this file describes it and lists its variants and links, but not the data values shown on the map.

- Map: https://atlasderschweiz.ch/en/theme/classification-of-rocks/
- Map id: 353
- Categories: Nature and Environment › Geology and raw materials › Geology and tectonics
- Keywords: Geology, Rocks
- Published: 2004-01-15
- Last revised: 2022-01-20
- Content language: English
- Other languages: [Deutsch](https://atlasderschweiz.ch/de/thema/gesteinsklassierung.md), [Français](https://atlasderschweiz.ch/fr/theme/classification-des-roches.md), [Italiano](https://atlasderschweiz.ch/it/tema/classificazione-delle-rocce.md)

## Description

In a general classification, the three principal rock types may be differentiated as follows:

*Loose rocks*
Loose deposits from rivers and glaciers.

*Sedimentary rocks*
Compacted loose rocks whose rock components have different origins and dimensions and which are held together by a cement. They can be differentiated into clastic sedimentary rocks or biogenic sedimentary rocks, according to their origin.

*Crystalline rocks*
Rocks which are principally formed of crystallised material. Crystalline rocks can be classified according to origin as magmatic rocks or metamorphic rocks.

## Sources

- SGTK (2004)

## Data sources

- swisstopo, Landesgeologie (2010): [GeoKarten500, GeoCover](http://www.swisstopo.admin.ch/internet/swisstopo/de/home/swisstopo/org/geology.html)

## Data owners

- [Swiss Federal Office of Topography (swisstopo)](http://www.swisstopo.admin.ch/)

## Citation

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> Atlas of Switzerland (2022): Classification of rocks. ETH Zürich. Map data © swisstopo. https://atlasderschweiz.ch/en/theme/classification-of-rocks/

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