impsoniten.
/ˈɪmpsənʌɪt/ Mineralogy.
An asphaltic mineral similar to albertite.
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impsonite1901
1901 G. H. Eldridge in 22nd Ann. Rep. U.S. Geol. Surv. 1900–1: Pt. 1 265 This differs from albertite, however, sufficiently, it is thought, to warrant a distinctive name, and for this, impsonite is suggested, after the valley in which it is chiefly found.
1909 E. S. Dana & W. E. Ford in E. S. Dana J. D. Dana's Syst. Mineral. (new ed.) Appendix ii. 55 Impsonite, an asphalt closely similar to albertite but differing in being almost insoluble in turpentine. Found occurring in veins in shales from Impson valley, Indian Territory.
1925 H. Ries & T. L. Watson Engin. Geol. (ed. 3) 585 Impsonite. Oklahoma.
1951 E. N. Tiratsoo Petroleum Geol. xi. 292 Impsonite..seems to be a kind of end-product in the process of bitumen formation, having a very high proportion of fixed carbon and being infusible.
1965 E. T. Degens Geochem. Sediments v. 263 One may distinguish between the asphaltic, e.g. wurtzilite, elaterite, albertite, and impsonite, and the nonasphaltic pyrobitumens.
This entry has not yet been fully updated (first published 1933; most recently modified version published online March 2019).
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n.1901