leptite

leptite

[′lep‚tīt]
(petrology)
A quartz-feldspathic metamorphic rock that is fine-grained with little or no foliation; formed by regional metamorphism of the highest grade.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The basement comprises the Paleoproterozoic metamorphic rocks of the Wutai Group that is mainly made up of gneiss, amphibolite, leptite, and mica quartz schist.
Generally speaking, the ore body in Zinkgruvan mine is hosted by leptites. Further out in the hanging wall, there is limestone (marble) with considerably lower compressive strength when compared with that of the leptite.
Like almost all other ore deposits in the Proterozoic of central Sweden, those of the Riddarhyttan ore district occur within a supracrustal rock sequence, including various felsic metavolcanic rocks and metasediments, known as the Leptite Formation.