1. Clay-slate.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• zrgillite,
• srgillite,
• wrgillite,
• qrgillite,
• aegillite,
• adgillite,
• afgillite,
• atgillite,
• a5gillite,
• a4gillite,
• arfillite,
• arvillite,
• arbillite,
• arhillite,
• aryillite,
• artillite,
• argullite,
• argjllite,
• argillit,
• arcillite

• archil,
• arcella,
• arugula,
• argillaceous,
• arcellidae,
• argylls,
• argyll,
• archila,
• argali.

The adjective form of the word "argillite" is "argillitic".

The plural of the "argillite" can be the "argillites".

The singular of the "argillite" can be the "argillite".