Wilancookite

Wilancookite is a very rare and complex beryllium phosphate with the chemical formula (Ba,K,Na)₈(Ba,Li,[ ])₆Be₂₄P₂₄O₉₆·32H₂O. Wilancookite was discovered in pegmatite of the Lavra Ponte do Piauí complex, Jequitinhonha, Minas Gerais, Brazil.^[2][3]

Wilancookite
Wilancookite from Ponte do Piauí claim, Piauí valley, Taquaral, Itinga, Jequitinhonha valley, Minas Gerais, Brazil
General
Category	Phosphate
Formula	(Ba,K,Na)8(Ba,Li,[ ])6Be24P24O96·32H2O
IMA symbol	Wck[1]
Crystal system	Isometric
Crystal class	Tetartoidal (23) H-M symbol: (23)
Space group	I23
Unit cell	a = 13.54 Å (approximated)
Identification
References	[2]

Relation to other minerals

Wilancookite is related to pahasapaite,^[2] a lithium-bearing beryllium phosphate mineral.^[4]