The order-disorder character of owyheeite

TY - JOUR

T1 - The order-disorder character of owyheeite

AU - Makovicky, Emil

AU - Olsen, Peter Nefer

PY - 2015

Y1 - 2015

N2 - Owyheeite, Ag1.5Pb4.43Sb6.07S14, monoclinic and pseudo-orthorhombic, is invariably intimately twinned, and its structure displays an alternation of two types of unit order-disorder (OD) layers, with layer symmetries P(2/n) 2(1)/m 2(1)/m for the thicker OD layer, and P (1) 1 2(1)/m for the three-times thinner OD layer. These layers occur in two orientations, indexed as (021) and (021) of the owyheeite lattice. Ambiguity in the orientation of the thinner OD layer after the thicker one leads to intimate twinning (stacking disorder). Pseudohexagonality of the lattice (b×=3/2 ∼ c) with two alternative sets of OD layers further complicates the twinning situation, which also can be described using a rod representation of the structure.

AB - Owyheeite, Ag1.5Pb4.43Sb6.07S14, monoclinic and pseudo-orthorhombic, is invariably intimately twinned, and its structure displays an alternation of two types of unit order-disorder (OD) layers, with layer symmetries P(2/n) 2(1)/m 2(1)/m for the thicker OD layer, and P (1) 1 2(1)/m for the three-times thinner OD layer. These layers occur in two orientations, indexed as (021) and (021) of the owyheeite lattice. Ambiguity in the orientation of the thinner OD layer after the thicker one leads to intimate twinning (stacking disorder). Pseudohexagonality of the lattice (b×=3/2 ∼ c) with two alternative sets of OD layers further complicates the twinning situation, which also can be described using a rod representation of the structure.

KW - Order-disorder character

KW - Owyheeite

KW - Pseudohexagonality

KW - Rod-based sulfosalt

KW - Twinning

U2 - 10.3749/canmin.1500002

DO - 10.3749/canmin.1500002

M3 - Journal article

AN - SCOPUS:84987943185

SN - 0008-4476

VL - 53

SP - 879

EP - 884

JO - Canadian Mineralogist

JF - Canadian Mineralogist

IS - 5

ER -