Editing Lignite (section)

== Types == <!--xyloid lignite, compact lignite, and perfect lignite; redirect here-->
Lignite can be separated into two types: xyloid lignite or [[fossil wood]], and compact lignite or perfect lignite.

Although xyloid lignite may sometimes have the tenacity and the appearance of ordinary wood, it can be seen that the combustible woody tissue has experienced a great modification. It is reducible to a fine powder by [[trituration]], and if submitted to the action of a weak solution of [[potash]], it yields a considerable quantity of [[humic acid]].<ref Name="Mackie">{{cite book | last =Mackie | first =Samuel Joseph | title =The Geologist | publisher =Reynolds | year = 1861 | location = Original from Harvard University | pages =197–200 | url =https://books.google.com/books?id=SzsFAAAAYAAJ&q=Xyloid+coal&pg=PA199}}</ref> [[Leonardite]] is an oxidized form of lignite, which also contains high levels of humic acid.<ref>{{Cite book|url=https://books.google.com/books?id=oIh9_U0Fo_cC&dq=leonardite+humic+acid+extractable&pg=PA26|title=Humic Matter in Soil and the Environment: Principles and Controversies|first=Kim H.|last=Tan|date=22 April 2003|publisher=CRC Press|isbn=9780203912546 |access-date=30 June 2022|via=Google Books}}</ref>

Jet is a hardened, [[gemstone|gem-like]] form of lignite used in various types of jewelry.<ref name="Glossary2005"/><!-- Yes, this duplicates infomation in the Uses section. It's relevant to both.-->