The crystal structures of adamite and paradamite

抄録

The crystal structures of adamite, Zn₂(OH)(AsO₄), and its dimorph, paradamite have been refined. Adamite is the andalusite-type structure, and paradamite is isostructural with tarbuttite. The structures of these two minerals are compared. Mean bond lengths of these structures are:

	adamite		paradamite
As–O	1.69Å	1.68Å
Zn(VI)–O	2.13	–
Zn(V)–O	2.04		{	2.066
				2.06