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 © Copyright: Conwy Valley Systems Limited  2000-2016.

Conwy Valley Systems Limited,

Wells House, 12, Hawes Drive,

Deganwy, Conwy, LL31 9BW, United Kingdom.

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PETROG applied

PETROG is the perfect tool for point counting, whatever the application:

Coal Maceral Analysis

PETROG supports all relevant point counting standards: ICCP, TSOP, ISO 7404, Australian Standard 2856 (parts 2 & 3 in particular). The technical specification of the stepping stage and the implementation of the software allows the user to meet and exceed all relevant protocols and standards specifications.

Oil and Gas

Point counting is the one time that the rock is looked at in detail, complementing the overview analysis of core description and providing ground-truthing to the indirect and remotely sensed data such as petrophysics and geophysics.


PETROG supports all relevant point counting standards: ASTM C457/C457M -10a (2010) and ASTM C295 – 08 (2008) and ASTM C90 are fully supported by PETROG. See, for example, Chapter 2, of the New Edition of Concrete Petrography by Alan Poole.

Cement Clinker

Point-counting is an important tool for quality assurance of cement clinker. It is not replaced by tools such as Rietveldt refinement. Rather, visual examination of the material using reflected light microscopy on polished blocks is essential for ascertaining the minerals composition in addition to the chemical composition given by XRD/XRF techniques.

"A chemical analysis alone cannot describe the form, particle size, or mineralogy of the feed. SiO2 from a chemical analysis does not necessarily mean quartz, nor does Fe2O3 necessarily imply hematite. Analysis by X-ray diffraction (XRD) quite accurately records most of the detectable mineralogical varieties and with calibrated standards allows an estimation of abundance. But XRD cannot elucidate the particle form or size, and virtually misses the occurrence of amorphous materials such as glass or poorly crystalline materials such as limonite, FeO(OH), a major constituent in many iron sources for portland cement. Phases below the detection limit by XRD can easily be seen in the microscope. " (from MICROSCOPICAL EXAMINATION AND INTERPRETATION OF PORTLAND CEMENT AND CLINKER by Donald H. Campbell, Ph.D., SP030)


 "Methods for the Determination of Hazardous Substances" (UK Health and Safety Laboratory) shows the many situations in which point counting using plane and cross-polarised light is MDHS 39/41 and MDHS 592. See also U.S. Environmental Protection Agency Part 61, M, Asbestos References: 61.141