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Excerpt


Table 1. Typical GR values for popular minerals

Rock TypeGR, API GAPI
1Halite (Rock Salt)0
2Coal0
3Limestone5 – 10
4Sandstone10 – 20
5Dolomite10 – 20
6Shale80 – 140
7Mica100 – 170
8Sylvite (KCl)500


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