SIST EN 12407:2007

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Natural stone test methods - Petrographic examinationPreskušanje naravnega kamna - Petrografska preiskavaMéthodes d'essai pour pierres naturelles - Examen pétrographiquePrüfverfahren für Naturstein - Petrographische PrüfungTa slovenski standard je istoveten z:EN 12407:2007SIST EN 12407:2007en;fr;de91.100.15Mineralni materiali in izdelkiMineral materials and products73.020Rudarstvo in kamnolomsko izkopavanjeMining and quarryingICS:SIST EN 12407:20021DGRPHãþDSLOVENSKI
STANDARDSIST EN 12407:200701-junij-2007







EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12407March 2007ICS 73.020; 91.100.15Supersedes EN 12407:2000
English VersionNatural stone test methods - Petrographic examinationMéthodes d'essai de pierres naturelles - ExamenpétrographiquePrüfverfahren für Naturstein - Petrographische PrüfungThis European Standard was approved by CEN on 21 January 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12407:2007: E



EN 12407:2007 (E) 2 Contents Page Foreword.3 Introduction.4 1 Scope.5 2 Normative references.5 3 Principle.5 4 Apparatus.5 5 Preparation of thin and polished sections.6 5.1 General.6 5.2 Preparation of thick samples.6 5.3 Preparation of thin samples.6 5.4 Staining.7 5.4.1 Feldspar staining.7 5.4.2 Carbonate staining.7 6 Macroscopic description.7 6.1 General.7 7 Microscopic description.8 8 Petrographic definition.9 9 Test report.10 Annex A (informative)
Template for the petrographic description of rocks.11 Bibliography.18



EN 12407:2007 (E)
3 Foreword This document (EN 12407:2007) has been prepared by Technical Committee CEN/TC 246 “Natural stones”, the secretariat of which is held by UNI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2007, and conflicting national standards shall be withdrawn at the latest by September 2007. This document supersedes EN 12407:2000. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.



EN 12407:2007 (E) 4 Introduction A petrographic description of natural stone is important not only for the purposes of petrographic classification but also in order to highlight features influencing its chemical, physical and mechanical behaviour. In the same way the determination of the stone’s origin could be necessary (e.g. in the case of restoration of historical monuments). It is therefore essential to characterize the natural stones not only from the point of view of their mineral components and of their fabric and structure but also in terms of any features as: colour, presence of veins, of fossils, of discontinuities, etc. To ensure that the petrographic classification is objective, it is essential that the characterization of the material be, as far as possible, quantitative.



EN 12407:2007 (E)
5 1 Scope This European Standard specifies methods for making technical petrographic descriptions of natural stone, except for roofing slates. For this product, the method for the petrographic examination is defined in EN 12326 –2. Although chemical and physical methods of analysis are required for petrographic classification of some stone types, these methods will not be described in this standard.
2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 12670, Natural stone – Terminology EN 12440, Natural stone – Denomination criteria 3 Principle First a macroscopic description of the sample is undertaken. The macroscopic description may involve a visual inspection aided by a hand lens or a stereoscopic microscope. Then one or more thin sections prepared from the sample are examined using a petrographic microscope in order to give a microscopic description of the sample; where appropriate an additional polished section shall be prepared.
4 Apparatus 4.1 Hand lens or stereoscopic microscope (if required) 4.2 Rock cutter with sliding guide, water cooled and with a vertical diamond disk 3 mm thick 4.3 Electrical heating plate 4.4 Glass plate 300 mm x 400 mm x 10 mm 4.5 Bristle brush 4.6 Multiple rectifier for thin slides for 16 slides, water cooled and semiautomatic stop. Thin sections can also be prepared by hand by a thin slides preparation expert 4.7 Electric solder 4.8 Multi Form mold 40 mm and plastic cup 4.9 Grinding and polishing machine 4.10 Petrographic microscope 4.11 Point counter or image analysis (if required)



EN 12407:2007 (E) 6 4.12 A Rock Colour Chart or another colour reference chart (if required) 4.13 Reactives and products: Canada Balsam, Thermoplastic cement, Epoxi resin, Epoxi hardener, Carborundum (F220, F400, F600, F800), Supporting glass (28 mm x48 mm x1,8 mm), cover glass (24 mm x32 mm), diamond disks, xileno & ethanol, sodium cobalt nitrite, hydrofluoric acid, hydrochloric acid, sulphosodic alizarine solution. 5 Preparation of thin and polished sections 5.1 General The sampling is not responsibility of the test laboratory except where specially requested. The dimensions of the sample shall be large enough to be representative of the petrographic characteristics of the stone being examined. One or more thin sections are then prepared.
A thin section is a portion of material mounted on a slide and mechanically reduced to a thin sheet measuring (0,030 ± 0,005) mm in thickness, and normally protected by a slide cover. For special purposes (observations with reflected light microscope for the determination of opaque minerals or microprobe analysis) polished sections or polished thin sections shall be prepared. Polished sections and polished thin sections have one side polished with alumina polishing paste (5 µm to 12 µm grade) and diamond paste (6 µm, 3 µm and 1 µm). The polished side remains uncovered. The section normally measures about 44 mm x 28 mm, but in the case of larger grain size stones, larger dimensions may be used (e.g. 75 mm x 50 mm) or several sections of normal dimensions can be prepared. If the rock is anisotropic it is necessary to prepare at least two sections with different orientation with respect to the anisotropy (e.g. parallel and perpendicular to bedding planes, cleavage planes). Preparation of thick samples The sample shall be sufficiently coherent so as not to disintegrate when cut. If the stone is brittle or fragile, it will be necessary to strengthen it by means of impregnation, preferably in a vacuum, with resins with an index of refraction approximately 1,54 (e.g. epoxy resins). Using the rock cutter several small blocks are cut of 44 mm x 32 mm and 3 to 4 mm thick. In case of porous samples pores are filled with Canada balsam, heated on the plate to approximately 100 °C and then cooled. Blocks are then successfully ground using diamond discs between 1 and 2 min depending on the type and hardness of the stone. Preparation of thin samples Blocks are cleaned placed on the plate and then treated with Canada balsam until caramel colour. After cooling and scratching the balsam off the surface, they are grinded dry in the glass plate with carborundum avoiding the appearance of pores. The blocks are then cleaned with the bristle brush to eliminate all carborundum particles. They are later heated in the plate with the adhesive mounting them on the supporting glass with thermoplastic adhesive. The samples are then mounted in the rectifying machine until sample thickness is 1 mm. Then they are subjected to another wet grinding process on the glass plates with the different carborundum sizes, checking the thickness every now and then controlling polarizing colours of one reference mineral existing in the sample, ending the process once the stipulated colours have been achieved (first order white and grey for quartz and feldspar for example). Thin slides are then washed with water and dried with a cloth. Samples are then cut by the edges with a cutter up until the measures of the cover glass (generally 24 mm x 32 mm). Then a volume of balsam of approximately 0,5 ml is poured over the samples and heated on the plate to 60 °C, exerting pressure on the cover plate to favour a thorough cover of the balsam over the samp
...