Usually means: Sedimentary rock containing aluminum minerals.
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We found 6 dictionaries that define the word alum slate:

General (5 matching dictionaries)
  1. alum slate: Merriam-Webster
  2. alum slate: Wiktionary
  3. Alum slate: Dictionary.com
  4. alum-slate: Webster's 1828 Dictionary
  5. alum slate: FreeDictionary.org

Computing (1 matching dictionary)
  1. alum slate: Encyclopedia

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Definitions from Wiktionary (alum slate)

▸ noun:  (geology) A slate consisting mainly of clay, iron pyrites, and coaly matter, from which alum is obtained.

Similar:
alum shale, alum schist, alum stone, alumstone, alumine, polishing slate, alum rock, soda alum, alunite, sodium alum, more...

Opposite:
calcareous slate, argillaceous slate, clay slate

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Similar:
alum shale, alum schist, alum stone, alumstone, alumine, polishing slate, alum rock, soda alum, alunite, sodium alum, more...

Opposite:
calcareous slate, argillaceous slate, clay slate



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