Definition
Mudstone is a fine-grained, dark gray sedimentary rock, which is formed from silt and clay and is similar to shale but has less laminations
Aplite is a fine-grained granite composed mainly of feldspar and quartz
History
Origin
-
Iran
Discoverer
William Smith
Unknown
Etymology
From the English mud and stone, from low German mudde and stainaz
From German Aplit, from Greek haploos simple + -ite
Class
Sedimentary Rocks
Igneous Rocks
Sub-Class
Durable Rock, Soft Rock
Durable Rock, Hard Rock
Family
Group
-
Plutonic
Other Categories
Fine Grained Rock, Opaque Rock
Fine Grained Rock, Opaque Rock