A new classification system for pebble and crystal shapes based on static equilibrium points

Tímea Szabó; Gábor Domokos

doi:10.1556/ceugeol.53.2010.1.1

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Central European Geology

Volume/Issue:: Volume 53: Issue 1

A new classification system for pebble and crystal shapes based on static equilibrium points

Authors:

Tímea Szabó

Tímea Szabó Department of Mechanics, Materials and Structures, Budapest University of Technology and Economics, Budapest, Hungary
H-1111, Budapest, Mûegyetem rkp. 3, K242, Hungary, domokos@iit.bme.hu

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Gábor Domokos

Gábor Domokos Department of Mechanics, Materials and Structures, Budapest University of Technology and Economics, Budapest, Hungary
H-1111, Budapest, Mûegyetem rkp. 3, K242, Hungary, domokos@iit.bme.hu

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Pages:: 1–19

Online Publication Date:: 01 Mar 2010

Publication Date:: 01 Mar 2010

Article Category:: Research Article

DOI:: https://doi.org/10.1556/ceugeol.53.2010.1.1

Keywords:: pebble; shape indices; Zingg classes; static equilibria; crystal

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Abstract

The most widespread classification system for pebble shapes in geology is the Zingg system which relies on several length measurements. Here we propose a completely different classification system which involves counting static equilibria. We show that our system is practically applicable: simple hand experiments are suitable and easy to use to determine equilibrium classes. We also propose a simplified classification scheme called E-classification which is considerably faster in practice than the classical Zingg method. Based on statistical results of 1000 pebbles from several different geologic locations we show that E-classes are closely related to the geometric shape of pebbles. We compared E-classes to the Zingg classes, and we found that all the information contained in Zingg classification can be extracted from equilibrium classification. However, the new method is more sophisticated: it may help to identify shape attributes not discovered so far and it is able to store information on special geometries, e.g. on crystal shapes.

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Central European Geology

Print ISSN:: 1788-2281

Online ISSN:: 1789-3348

Editorial Board

Zsolt BENKÓ (Geochemistry, Ar dating; Institute for Nuclear Research, Debrecen)
Szabolcs HARANGI (Petrology, geochemistry, volcanology; Eötvös Loránd University, Budapest)
Anette GÖTZ (Sedimentology; Landesamt für Bergbau, Energie und Geologie, Hannover)
János HAAS (Regional Geology and Sedimentology; Eötvös Loránd University, Budapest)
István Gábor HATVANI (Geomathematics; Institute for Geological and Geochemical Research, Budapest)
Henry M. LIEBERMAN (Language Editor; Salt Lake City)
János KOVÁCS (Quaternary geology; University of Pécs)
Szilvia KÖVÉR (Sedimentology; Eötvös Loránd University, Budapest)
Tivadar M. TÓTH (Mineralogy; Petrology University of Szeged)
Stephen J. MOJZSIS (Petrology, geochemistry and planetology; University of Colorado Boulder)
Norbert NÉMETH (Structural geology; University of Miskolc)
Attila ŐSI (Paleontology; Eötvös Loránd University, Budapest)
József PÁLFY (Fossils and Stratigraphic Records; Eötvös Loránd University, Budapest)
György POGÁCSÁS (Petroleum Geology; Eötvös Loránd University, Budapest)
Krisztina SEBE (Tectonics, sedimentology, geomorphology University of Pécs)
Ioan SEGHEDY (Petrology and geochemistry; Institute of Geodynamics, Bucharest)
Lóránd SILYE (Paleontology; Babeș-Bolyai University, Cluj-Napoca)
Ákos TÖRÖK (Applied and Environmental Earth Sciences; Budapest University of Technology and Economics, Budapest)
Norbert ZAJZON (Petrology and geochemistry; University of Miskolc)
Ferenc MOLNÁR (ore geology, geochemistry, geochronology, archaeometry; Geological Survey of Finland, Espoo)

Advisory Board

Due to the changes in editorial functions, the Advisory Board has been terminated. The participation of former Advisory Board members is highly appreciated and gratefully thanked.

CENTRAL EUROPEAN GEOLOGY
Institute for Geochemical Research
Hungarian Academy of Sciences
Address: Budaörsi út 45. H-1112 Budapest, Hungary
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2023
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CiteScore	1.4
CiteScore rank	Q3 (Geology)
SNIP	0.577
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SJR Q rank	Q4

Central European Geology
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Central European Geology
Language	English
Size	Vol 1-63: B5 Vol 64- : A4
Year of Foundation	2007 (1952)
Volumes per Year	1
Issues per Year	2
Founder	Magyar Tudományos Akadémia
Founder's Address	H-1051 Budapest, Hungary, Széchenyi István tér 9.
Publisher	Akadémiai Kiadó
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	1788-2281 (Print)
ISSN	1789-3348 (Online)