Formula :
Al4[(OH)8/Si4O10]
System: monoclinic Hardness:2-2½ Rarity:not common
Strunz id:VIII/H.25-20 -
SILICATES
Name origin: Named after Allan Brugh Dick (31 May 1833, Edinburgh, Scotland - 12 June 1926, Hampstead, London, UK), Scottish metallurgical chemist, who first described the species.
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