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Reppiaite, Mn5(OH)4(VO4)2, a new mineral from Val Graveglia (Northern Apennines, Italy)

Published/Copyright: August 24, 2010
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Zeitschrift für Kristallographie - Crystalline Materials
From the journal Zeitschrift für Kristallographie - Crystalline Materials Volume 201 Issue 3-4

Abstract

Reppiaite occurs in manganese ores at the Gambatesa Mine, near Reppia village (Val Graveglia, Italy), mainly associated with a Mn-sheet silicate and Mn – Ca-carbonates. It was found in small amounts of very minute tabular crystals, (100) flattened, grown in fracture. Reppiaite, with ideal formula Mn5(OH)4(VO4)2, crystallizes in C2/m space group with a = 9.604(2) Å, b = 9.558(2) Å, c = 5.393(1) Å and β = 98.45(1)°. The strongest lines in the X-ray powder pattern are d13[unk] = 2.68 Å and d200 = 4.76 Å. It is orange-red in colour, transparent, biaxial negative with 2 V large and slightly pleochroic. Microprobe analyses reveal a partial As substitution for V, leading to the empirical formula Mn5.01(OH)3.98[(V1.65-As0.35)O8.02]. The crystal structure of reppiaite is constructed of a quasi cubic close-packing of oxygens and hydroxyl groups, whose layers are stacked parallel to (100). The structure, refined to R = 0.038, consists of Mn octahedral layers bound together by isolated (V, As) tetrahedra and hydrogen bonds. Among the minerals, whose chemical formula has the same atomic proportions of reppiaite, only cornubite shows very similar structural features.

Published Online: 2010-8-24
Published in Print: 1992-2-1

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Articles in the same Issue

  1. Crystal structure of a magnesium chloride-ethylformate adduct
  2. The crystal structure of triethylenetetramine copper(II)fluorophosphate, Cu(trien)(PF6)2
  3. Crystal structure of mesogenic material – trans-4-propyl cyclohexyl-4-(trans-4-pentyl cyclohexyl) benzoate
  4. The role of OH and H2O in oxide and oxysalt minerals
  5. Redetermination of the crystal structure of diammine silver(I)-sulfate, [Ag(NH3)2]2SO4
  6. Geometrische und chemische Koordination
  7. Reppiaite, Mn5(OH)4(VO4)2, a new mineral from Val Graveglia (Northern Apennines, Italy)
  8. Crystal structures and crystal chemistry of compounds M5−pT4+pO14*
  9. Crystal chemistry of beryllophosphates: The crystal structure of moraesite, Be2(PO4)(OH) · 4H2O
  10. Beraunite: Refinement, comparative crystal chemistry, and selected bond valences
  11. Crystal structure of thallium tetrafluoroborate, TlBF4
  12. Crystal structure of (η3-syn-crotyl)-(η4-cycloocta-1,5-diene)-nickel(II) hexafluorophosphate, Ni(C8H12)(C4H7)PF6
  13. Crystal structure of (η8-cycloocta-l,3,5,7-tetraene)-(2,2′-dipyridyl)-titanium(I) chloride, Ti(C8H8)(C10H8N2)Cl
  14. Crystal structure of (η3-syn-crotyl)-(η4-cycloocta-1,5-diene)-nickel(II) trifluormethylsulfonate, Ni(C12H19)(SO2CF3)
  15. Crystal structure of μ-hydrido-μ-dicyclohexylphosphido-octacarbonyl-dirhenium, (H)(P(C6H11)2)(CO)8Re2
  16. Crystal structure of μ-dicyclohexylphosphido-dodecacarbonyl-triangulo-trirhenium, (P(C6H11)2)(Re(CO)4)3
  17. Crystal structure of di-μ3-[(pentacarbonyl-manganese)stannio(IV)]-nonacarbonyl-triangulotriiron(Fe-Fe), (SnMn(CO)5)2Fe3(CO)9
  18. Crystal structure of calcium gold aluminium (1/1/1), CaAuAl
  19. Crystal structure of calcium gold aluminium (1/0.9/3.1), CaAu0.9Al3.1
  20. Crystal structure of barium gold gallium (1/0.3/3.7), BaAu0.3Ga3.7
  21. Crystal structure of strontium gold gallium (1/1/3), SrAuGa3
  22. Crystal structure of calcium cadmium gallium (1/0.7/1.3), CaCd0.7Ga1.3
  23. Crystal structure of strontium cadmium gallium (1/1.3/0.7), SrCd1.3Ga0.7
  24. Crystal structure of strontium cadmium gallium (1/2/2), SrCd2Ga2
  25. Crystal structure of barium cadmium gallium (1/3.2/0.8), BaCd3.2Ga0.8
  26. Crystal structure of N-diphenylphosphine-l-amino-3-(2′-pyridyl)-isoquinoline-chloropalladium(II) chloride chloroform methanol solvate, (P(C6H5)2)(C9N2H6)(C5NH4)(PdCl)Cl(CHCl3)(CH3OH)
  27. Crystal structure of μ-dicyclohexylphosphido-triphenylphosphine-octacarbonyl-triangulo-copperdirhenium, (P(C6H11)2)(CO)8Re2Cu(P(C6H5)3)
  28. Crystal structure of caesium rubidium di-μ-arsenidobis(arsenidogallate), Cs5.18Rb0.82Ga2As4
  29. Crystal structure of caesium rubidium di-μ-phosphido-bis(phosphidogallate), Cs4.95Rb1.05Ga2P4
https://doi.org/10.1524/zkri.1992.201.3-4.223

Articles in the same Issue

  1. Crystal structure of a magnesium chloride-ethylformate adduct
  2. The crystal structure of triethylenetetramine copper(II)fluorophosphate, Cu(trien)(PF6)2
  3. Crystal structure of mesogenic material – trans-4-propyl cyclohexyl-4-(trans-4-pentyl cyclohexyl) benzoate
  4. The role of OH and H2O in oxide and oxysalt minerals
  5. Redetermination of the crystal structure of diammine silver(I)-sulfate, [Ag(NH3)2]2SO4
  6. Geometrische und chemische Koordination
  7. Reppiaite, Mn5(OH)4(VO4)2, a new mineral from Val Graveglia (Northern Apennines, Italy)
  8. Crystal structures and crystal chemistry of compounds M5−pT4+pO14*
  9. Crystal chemistry of beryllophosphates: The crystal structure of moraesite, Be2(PO4)(OH) · 4H2O
  10. Beraunite: Refinement, comparative crystal chemistry, and selected bond valences
  11. Crystal structure of thallium tetrafluoroborate, TlBF4
  12. Crystal structure of (η3-syn-crotyl)-(η4-cycloocta-1,5-diene)-nickel(II) hexafluorophosphate, Ni(C8H12)(C4H7)PF6
  13. Crystal structure of (η8-cycloocta-l,3,5,7-tetraene)-(2,2′-dipyridyl)-titanium(I) chloride, Ti(C8H8)(C10H8N2)Cl
  14. Crystal structure of (η3-syn-crotyl)-(η4-cycloocta-1,5-diene)-nickel(II) trifluormethylsulfonate, Ni(C12H19)(SO2CF3)
  15. Crystal structure of μ-hydrido-μ-dicyclohexylphosphido-octacarbonyl-dirhenium, (H)(P(C6H11)2)(CO)8Re2
  16. Crystal structure of μ-dicyclohexylphosphido-dodecacarbonyl-triangulo-trirhenium, (P(C6H11)2)(Re(CO)4)3
  17. Crystal structure of di-μ3-[(pentacarbonyl-manganese)stannio(IV)]-nonacarbonyl-triangulotriiron(Fe-Fe), (SnMn(CO)5)2Fe3(CO)9
  18. Crystal structure of calcium gold aluminium (1/1/1), CaAuAl
  19. Crystal structure of calcium gold aluminium (1/0.9/3.1), CaAu0.9Al3.1
  20. Crystal structure of barium gold gallium (1/0.3/3.7), BaAu0.3Ga3.7
  21. Crystal structure of strontium gold gallium (1/1/3), SrAuGa3
  22. Crystal structure of calcium cadmium gallium (1/0.7/1.3), CaCd0.7Ga1.3
  23. Crystal structure of strontium cadmium gallium (1/1.3/0.7), SrCd1.3Ga0.7
  24. Crystal structure of strontium cadmium gallium (1/2/2), SrCd2Ga2
  25. Crystal structure of barium cadmium gallium (1/3.2/0.8), BaCd3.2Ga0.8
  26. Crystal structure of N-diphenylphosphine-l-amino-3-(2′-pyridyl)-isoquinoline-chloropalladium(II) chloride chloroform methanol solvate, (P(C6H5)2)(C9N2H6)(C5NH4)(PdCl)Cl(CHCl3)(CH3OH)
  27. Crystal structure of μ-dicyclohexylphosphido-triphenylphosphine-octacarbonyl-triangulo-copperdirhenium, (P(C6H11)2)(CO)8Re2Cu(P(C6H5)3)
  28. Crystal structure of caesium rubidium di-μ-arsenidobis(arsenidogallate), Cs5.18Rb0.82Ga2As4
  29. Crystal structure of caesium rubidium di-μ-phosphido-bis(phosphidogallate), Cs4.95Rb1.05Ga2P4
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