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Dickite

Dickite is a phyllosilicate clay mineral named after the metallurgical chemist Allan Brugh Dick, who first described it. It is chemically composed of 20.90% aluminium, 21.76% silicon, 1.56% hydrogen and 55.78% oxygen. Wikipedia

Crystal class: Domatic (m); (same H-M symbol)

Crystal habit: Pseudohexagonal crystals, aggregates of platelets and compact massive

Crystal system: Monoclinic

Formula (repeating unit): Al2Si2O5(OH)4

Mohs scale hardness: 1.5–2