Definition
Origin
Discoverer
Etymology
Class
Sub-Class
Group
Other Categories
Limestone is a sedimentary rock composed mostly of calcite and aragonite, which are different crystal forms of calcium carbonate
From lime and stone in late 14th Century
Durable Rock, Medium Hardness Rock
Fine Grained Rock, Opaque Rock
Phyllite is a fine-grained metamorphic rock with a well-developed laminar structure, and is intermediate between slate and schist rocks
From Greek phullon leaf + -ite1
Coarse Grained Rock, Fine Grained Rock, Medium Grained Rock, Opaque Rock