Definition
Lignite is a soft brownish coal which shows traces of plants and is intermediate between bituminous coal and peat
Jasperoid is a rare, peculiar type of metasomatic alteration of rocks
History
Origin
France
USA
Discoverer
Unknown
Unknown
Etymology
From French, Latin lignum wood + -ite1
From silica, the main mineral content of Jasperoid
Class
Sedimentary Rocks
Sedimentary Rocks
Sub-Class
Durable Rock, Soft Rock
Durable Rock, Medium Hardness Rock
Family
Group
-
-
Other Categories
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock