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Merelaniite

This page kindly sponsored by John A. Jaszczak
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About MerelaniiteHide

Formula:
Mo4Pb4VSbS15
Colour:
Dark grey
Crystal System:
Triclinic
Name:
Named after the locality of its discovery in honor of the local miners.
Cylindrite homologous series.

An arsenic-rich variety is also known. Merelaniite consists of alternating centered pseudo-tetragonal (Q) and pseudo-hexagonal (H) layers with respective PbS and MoS2 structure types.

Awarded 'Mineral of the Year' by the IMA-CNMNC in 2016


Classification of MerelaniiteHide

Approved
Approval Year:
2016
First Published:
2016

Physical Properties of MerelaniiteHide

Colour:
Dark grey

Chemical Properties of MerelaniiteHide

Formula:
Mo4Pb4VSbS15
IMA Formula:
Pb4Mo4VSbS15

Crystallography of MerelaniiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Cell Parameters:
a = 5.929(8) Å, b = 5.961(5) Å, c = 12.03(1) Å
α = 91.33(9)°, β = 90.88(5)°, γ = 91.79(4)°
Ratio:
a:b:c = 0.995 : 1 : 2.018
Unit Cell V:
425 ų
Z:
4
Morphology:
Cylindrical whiskers tens of micrometers in diameter and up to a millimeter long.
Comment:
C1 or C-1 (both layer types); the above unit cell parameters are for the Q layer, the corresponding H-layer ones are: 5.547(9), 3.156(4), 11.91(1), 89.52(9), 92.13(5), 90.18(4), 208, 2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
6.14 (30)
5.94 (60)
2.968 (25)
2.965 (100)
2.272 (40)
1.829 (30)

Type Occurrence of MerelaniiteHide

General Appearance of Type Material:
As metallic dark gray cylindrical whiskers that are typically tens of micrometers in diameter and up to a millimeter long (but may reach 12 mm)
Place of Conservation of Type Material:
Collections of the Natural History Museum, London, UK, registration numbers BM2016,100
Associated Minerals at Type Locality:

Synonyms of MerelaniiteHide

Relationship of Merelaniite to other SpeciesHide

Other Members of this group:
AbramovitePb2SnInBiS7Tric. 1 : P1
CylindritePb3Sn4FeSb2S14Tric. 1 : P1
LévyclauditePb8Sn7Cu3(Bi,Sb)3S28

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for MerelaniiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Jaszczak, J., Rumsey, M.S., Bindi, L., Hackney, S.A., Wise, M.A., Stanley, C.J. & Spratt, J. (2016) Merelaniite, Mo4Pb4VSbS15, a New Molybdenum-Essential Member of the Cylindrite Group, from the Merelani Tanzanite Deposit, Lelatema Mountains, Manyara Region, Tanzania. Minerals: 6 115; doi:10.3390/min6040115
Rumsey, M.S., Jaszczak, J.A., Bindi, L., Hackney, S.A., Wise, M.A., Stanley, C. and Spratt, J. (2016) IMA 2016-042. CNMNC Newsletter No. 33, October 2016, page 1137; Mineralogical Magazine: 80: 1135–1144

Internet Links for MerelaniiteHide

Localities for MerelaniiteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Tanzania (TL)
 
  • Manyara Region
    • Simanjiro District
      • Lelatema Mts
Jaszczak, J., Rumsey, M.S., Bindi, L., Hackney, S.A., Wise, M.A., Stanley, C.J. & Spratt, J. (2016): Merelaniite, Mo4Pb4VSbS15, a New Molybdenum-Essential Member of the Cylindrite Group, from the Merelani Tanzanite Deposit, Lelatema Mountains, Manyara Region, Tanzania. Minerals: 6 115; doi:10.3390/min6040115
Mineral and/or Locality  
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