The crystal chemistry of a naturally occurring magnesium hydroxide sulfate hydrate, a precipitate of heated seawater

1983 ◽  
Vol 47 (11) ◽  
pp. 2053-2058 ◽  
Author(s):  
Michael F Hochella ◽  
Keith D Keefer ◽  
Bernard H.W.S deJong
Keyword(s):  
Crystal Chemistry ◽  
Magnesium Hydroxide ◽  
Naturally Occurring ◽  
Sulfate Hydrate ◽  
Magnesium Hydroxide Sulfate Hydrate

Structure of Magnesium Hydroxide Sulfate [2MgSO4.Mg(OH)2] and Solid Solution in Magnesium Hydroxide Sulfate Hydrate and Caminite

1997 ◽  
Vol 53 (3) ◽  
pp. 358-363 ◽  
Author(s):  
M. E. Fleet ◽  
S. W. Knipe
Keyword(s):  
Solid Solution ◽  
Single Crystal ◽  
Magnesium Hydroxide ◽  
Substitution Reaction ◽  
Ocean Floor ◽  
Octahedral Position ◽  
X Ray ◽  
Sulfate Hydrate ◽  
Gold Bearing ◽  
Magnesium Hydroxide Sulfate Hydrate

Magnesium hydroxide sulfate [2MgSO4.Mg(OH)2; MHS] is tetragonal with a = 7.454 (1), c = 12.885 (2) Å, V = 716.0 Å3, space group P43212, Z = 4 and D x 2.774 g cm−3. The structure (single-crystal X-ray, R = 0.025, wR = 0.023) comprises spiral (43) single chains of corner-shared Mg(2) octahedra cross-linked by SO4 tetrahedra and face-shared Mg(1) octahedra. A linear ternary group of face-shared Mg octahedra [Mg(2)—Mg(1)—Mg(2)] alternates with an unoccupied octahedral position in rows along [\overline 110]. A crystal of MHS was grown hydrothermally (0.15 GPa, 673 K) from gold-bearing Mg—S—O—H fluid. The MHS structure, with Mg(1) octahedra sharing two octahedral faces with Mg(2) octahedra, revises the structure assumed for the complex solid solution magnesium hydroxide sulfate hydrate and the related ocean-floor mineral caminite [2MgSO4.xMg(OH)2.(2 − 2x)H2O; 0.5 < x < 1.0]. The substitution reaction appears to be Mg(1)2+ ⇋ 2H+. The H-substituted MHS structure is distinguished from that of kieserite (MgSO4.H2O), which has straight single chains of corner-shared Mg octahedra.

Superstructured magnesium hydroxide sulfate hydrate fibres

2001 ◽  
Vol 3 (2) ◽  
pp. 151-156 ◽  
Author(s):  
Yi Ding ◽  
Huazhang Zhao ◽  
Yugang Sun ◽  
Guangtao Zhang ◽  
Hao Wu ◽  
...  
Keyword(s):  
Magnesium Hydroxide ◽  
Sulfate Hydrate ◽  
Magnesium Hydroxide Sulfate Hydrate

Preparation and Characterization of Magnesium Hydroxide Sulfate Hydrate Whiskers

2000 ◽  
Vol 12 (10) ◽  
pp. 2845-2852 ◽  
Author(s):  
Yi Ding ◽  
Guangtao Zhang ◽  
Shuyuan Zhang ◽  
Xinming Huang ◽  
Weichao Yu ◽  
...  
Keyword(s):  
Magnesium Hydroxide ◽  
Sulfate Hydrate ◽  
Magnesium Hydroxide Sulfate Hydrate
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