Crystal structure of a (001) twinned sussexite Mn2B2O4 (OH)2 from the Kalahari manganese field South Africa

C. Hoffmann; T. Armbruster

Crystal structure of a (001) twinned sussexite Mn₂B₂O₄ (OH)₂ from the Kalahari manganese field South Africa

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Abstract

The crystal structure of a fibrous sussexite Mn_1.91Mg_0.09B₂O₄(OH)₂ was solved and refined from single-crystal X-ray data collected on (001) twinned crystals. Sussexite is isotypic to szaibelyite (Mg)₂B₂O₄(OH)₂, both crystallizing in space group P2₁/c. Two non-equivalent chains of Mn/Mg octahedra (Mn1, Mn2) are connected by corners thus forming layers perpendicular to the c-axis. These sheets are linked by triangular pyroborate-groups [B₂O₄(OH)]^3-. In addition, hydrogen bridges stabilize the octahedral layer structure. The cleavage plane of sussexite is parallel to the octahedral layers. The twinning of sussexite can not be resolved under the polarizing microscope; thus the twin components have either a very similar optic orientation or more probably, the twinning is on a submicroscopic scale. -from Authors

Original language	English
Pages (from-to)	123-133
Number of pages	11
Journal	Schweizerische Mineralogische und Petrographische Mitteilungen
Volume	75
Issue number	1
State	Published - 1995
Externally published	Yes

Cite this

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title = "Crystal structure of a (001) twinned sussexite Mn2B2O4 (OH)2 from the Kalahari manganese field South Africa",

abstract = "The crystal structure of a fibrous sussexite Mn1.91Mg0.09B2O4(OH)2 was solved and refined from single-crystal X-ray data collected on (001) twinned crystals. Sussexite is isotypic to szaibelyite (Mg)2B2O4(OH)2, both crystallizing in space group P21/c. Two non-equivalent chains of Mn/Mg octahedra (Mn1, Mn2) are connected by corners thus forming layers perpendicular to the c-axis. These sheets are linked by triangular pyroborate-groups [B2O4(OH)]3-. In addition, hydrogen bridges stabilize the octahedral layer structure. The cleavage plane of sussexite is parallel to the octahedral layers. The twinning of sussexite can not be resolved under the polarizing microscope; thus the twin components have either a very similar optic orientation or more probably, the twinning is on a submicroscopic scale. -from Authors",

author = "C. Hoffmann and T. Armbruster",

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T1 - Crystal structure of a (001) twinned sussexite Mn2B2O4 (OH)2 from the Kalahari manganese field South Africa

AU - Hoffmann, C.

AU - Armbruster, T.

PY - 1995

Y1 - 1995

N2 - The crystal structure of a fibrous sussexite Mn1.91Mg0.09B2O4(OH)2 was solved and refined from single-crystal X-ray data collected on (001) twinned crystals. Sussexite is isotypic to szaibelyite (Mg)2B2O4(OH)2, both crystallizing in space group P21/c. Two non-equivalent chains of Mn/Mg octahedra (Mn1, Mn2) are connected by corners thus forming layers perpendicular to the c-axis. These sheets are linked by triangular pyroborate-groups [B2O4(OH)]3-. In addition, hydrogen bridges stabilize the octahedral layer structure. The cleavage plane of sussexite is parallel to the octahedral layers. The twinning of sussexite can not be resolved under the polarizing microscope; thus the twin components have either a very similar optic orientation or more probably, the twinning is on a submicroscopic scale. -from Authors

AB - The crystal structure of a fibrous sussexite Mn1.91Mg0.09B2O4(OH)2 was solved and refined from single-crystal X-ray data collected on (001) twinned crystals. Sussexite is isotypic to szaibelyite (Mg)2B2O4(OH)2, both crystallizing in space group P21/c. Two non-equivalent chains of Mn/Mg octahedra (Mn1, Mn2) are connected by corners thus forming layers perpendicular to the c-axis. These sheets are linked by triangular pyroborate-groups [B2O4(OH)]3-. In addition, hydrogen bridges stabilize the octahedral layer structure. The cleavage plane of sussexite is parallel to the octahedral layers. The twinning of sussexite can not be resolved under the polarizing microscope; thus the twin components have either a very similar optic orientation or more probably, the twinning is on a submicroscopic scale. -from Authors

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Crystal structure of a (001) twinned sussexite Mn₂B₂O₄ (OH)₂ from the Kalahari manganese field South Africa

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