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May 26, 2018 Weekly Geology Guest, Slate

May 26, 2018
Greetings from the Bluff Park Back Porch, way up yonder on Shades Mountain (1,109′) in Alabama:

We will now continue down the Industrial Mineral dusty trail and continue with Slate.  (No, not the magazine)

Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade regional metamorphism.
The word “slate” is also used for certain types of object made from slate rock. It may mean a single roofing tile made of slate, or a writing slate.

In the context of underground coal mining in the United States, the term slate was commonly used to refer to shale well into the 20th century.[3] For example, roof slate referred to shale above a coal seam, and draw slate referred to shale that fell from the mine roof as the coal was removed.[4]
(lots of arguments UG over this one R.)


A piece of slate (~ 6 cm long and ~ 4 cm high)

Slate Roof

ZureksOwn work
St. Fagans, National Museum Wales (Cardiff, UK): Tannery (slate roof)

Slate gravestone in Hingham, Massachusetts
Gravestone of Deborah (Fearing) Leavitt (d. 1789), wife of Joshua Leavitt, Hingham Center Cemetery, Hingham, Massachusetts.  by Timothy Valentine.


{{A slate serving tray with a food-safe finish. Image attribution to}}

Besucherbergwerk Fell – Grube Hoffnung

Sorry folks, these are as pretty as they get.  Thanks, R.

Our next industrial mineral challenge will be
Enjoy the adventure!

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