endogangue

English

Etymology

From endo- +‎ gangue.

Noun

endogangue (usually uncountable, plural endogangues)

1. (mining) Gangue that is located inside phosphatic grains.

   Antonym: exogangue

   • 1978, J. Greensmith, Petrology of the Sedimentary Rocks:

     Endogangue includes yellow-brown to opaque humic matter of marine planktonic origin, siliciclastic grains and authigenic pyrite framboids and secondary apatite crystals.

   • 1986, Maurice Slansky, Geology of Sedimentary Phosphates, page 50:

     Certain pellets are very homogeneous in appearance, with practically no endogangue; grains of this type are frequently contained in sub-outcrop strata.

   • 1989, A. J. G. Notholt, D. F. Davidson, R. P. Sheldon (editors), Phosphate Deposits of the World: Volume 2, Phosphate Rock Resources, Volume 2, page 229:

     The other constituents (endogangue) are goethite, attapulgite and fine quartz granules.

   • 2020, Mostafa Benzaazoua, Yassine Taha (editors), Recent Trends in Phosphate Mining and Beneficiation and Related Waste Management, page 25:

     The exogangue is generally carbonated, showing phosphate grains surrounded by dolomite rhombohedra (Figure 1f), while the endogangue is present either as silica (Figure 1g) or carbonate grains (Figure 1h), occurring, respectively, as quartz or calcite included within the phosphate grains.