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Merelaniite

Pictures (9 Images total)

Merelaniite, Tremolite, Prehnite, Chabazite, Graphite, Calcite
Views (File:
1477698403
): 1561
Merelaniite, Tremolite, Prehnite, Chabazite, Graphite, Calcite
Cylindrical whisker (0.73 mm long) of merelaniite associated with tremolite, and prehnite (not shown also include graphite, calcite, and chabazite). Locality: Merelani Hills, Lelatema Mts, Simanjiro District, Manyara Region, Tanzania;
Copyright: John Jaszczak; Contribution: Stefan
Location: Tansania/Manyara, Region/Simanjiro, Distrikt/Merelani (Mererani)
Mineral: Merelaniite
Image: 1477698403
Rating: 10 (votes: 2)
License: Usage for Mineralienatlas project only
Merelaniite, Tremolite, Prehnite, Chabazite, Graphite, Calcite

Cylindrical whisker (0.73 mm long) of merelaniite associated with tremolite, and prehnite (not shown also include graphite, calcite, and chabazite). Locality: Merelani Hills, Lelatema Mts, Simanjir...
Copyright: John Jaszczak
Contribution: Stefan 2016-10-28
Locality: Merelani (Mererani) / Simanjiro, Distrikt / Manyara, Region / Tansania
Merelaniite
Views (File:
1480437438
): 1147
Merelaniite
Optical photographs of merelaniite and some associated minerals: (a) 0.73-mm-long “cylindrical” whisker of merelaniite associated with tremolite, prehnite, and chabazite (private collection); (b) Whisker of merelaniite (0.9-mm section), associated with calcite, showing undulating diameters (Simon Harrison collection; sample 3941); (c) 2.5-mm section of a 5-mm-long merelaniite whisker (maximum diameter 0.18 mm) showing naturally unraveled ribbons, some partially enclosed in calcite, and associated with yellow prehnite (Simon Harrison collection; sample 3941); John A. Jaszczak, Michael S. Rumsey, Luca Bindi, Stephen A. Hackney, Michael A.Wise, Chris J. Stanley and John Spratt
Copyright: John A. Jaszczak; Contribution: Stefan
Location: Tansania/Manyara, Region/Simanjiro, Distrikt/Merelani (Mererani)
Mineral: Merelaniite
Image: 1480437438
Rating: 10 (votes: 2)
License: Creative Commons - Attribution (CC-BY) V.3.0
Merelaniite

Optical photographs of merelaniite and some associated minerals: (a) 0.73-mm-long “cylindrical” whisker of merelaniite associated with tremolite, prehnite, and chabazite (private collection); (b) W...
Copyright: John A. Jaszczak
Contribution: Stefan 2016-11-29
Locality: Merelani (Mererani) / Simanjiro, Distrikt / Manyara, Region / Tansania
Merelaniite whiskers
Views (File:
1480437673
): 712
Merelaniite whiskers
Scanning electron microscope (SEM) images of samples taken from the holotype specimen. (a) Cluster of merelaniite whiskers with one notably larger cylinder, associated with graphite. (Sample 3666i-190i.); (b) Section of a merelaniite-graphite cluster showing well-formed graphite crystals (Sample 3666i-190h.); (c,d) Merelaniite whiskers showing partially un-wound layers. (Sample 3666-196a.); (e,f) Individual whiskers showing conical ends and undulating diameters (Samples 3666i 190d and 3666 196c). Images taken using a Hitachi S-4700 field-emission SEM (Hitachi, Tokyo, Japan). John A. Jaszczak, Michael S. Rumsey, Luca Bindi, Stephen A. Hackney, Michael A.Wise, Chris J. Stanley and John Spratt
Copyright: John A. Jaszczak; Contribution: Stefan
Location: Tansania/Manyara, Region/Simanjiro, Distrikt/Merelani (Mererani)
Mineral: Merelaniite
Image: 1480437673
Rating: 9.5 (votes: 2)
License: Creative Commons - Attribution (CC-BY) V.3.0
Merelaniite whiskers

Scanning electron microscope (SEM) images of samples taken from the holotype specimen. (a) Cluster of merelaniite whiskers with one notably larger cylinder, associated with graphite. (Sample 3666i-...
Copyright: John A. Jaszczak
Contribution: Stefan 2016-11-29
Locality: Merelani (Mererani) / Simanjiro, Distrikt / Manyara, Region / Tansania
Merelaniite, Stilbite, Graphite, Alabandite
Views (File:
1480436152
): 782
Merelaniite, Stilbite, Graphite, Alabandite
Whiskers of merelaniite, some showing an oscillatory variation in diameter, partly overgrown by stilbite crystals associated with small but very sharp graphite crystals. This was in a crevice in an 11-cm long crystal group of alabandite, and is part of the holotpe specimen of merelaniite. Locality: Merelani Hills, Lelatema Mts, Simanjiro District, Manyara Region, Tanzania; [http://www.mdpi.com/2075-163X/6/4/115]
Copyright: John A. Jaszczak; Contribution: Stefan
Location: Tansania/Manyara, Region/Simanjiro, Distrikt/Merelani (Mererani)
Mineral: Merelaniite
Image: 1480436152
Rating: 10 (votes: 1)
License: Usage for Mineralienatlas project only
Merelaniite, Stilbite, Graphite, Alabandite

Whiskers of merelaniite, some showing an oscillatory variation in diameter, partly overgrown by stilbite crystals associated with small but very sharp graphite crystals. This was in a crevice in an...
Copyright: John A. Jaszczak
Contribution: Stefan 2016-11-29
Locality: Merelani (Mererani) / Simanjiro, Distrikt / Manyara, Region / Tansania
Quartz crystal with inclusions of merelaniite
Views (File:
1480437563
): 468
Quartz crystal with inclusions of merelaniite
Optical photographs of (a) 2.8-cm-tall quartz crystal with inclusions of merelaniite whiskers, also associated with chabazite crystals; (b) close-up of (a) showing merelaniite, graphite and an unidentified fan-shaped phase at the left of the image (~8 mm wide field-of-view). (A. E. Seaman Mineral Museum collection DM 31315; ex. Simon Harrison collection.). John A. Jaszczak, Michael S. Rumsey, Luca Bindi, Stephen A. Hackney, Michael A.Wise, Chris J. Stanley and John Spratt
Copyright: John A. Jaszczak; Contribution: Stefan
Location: Tansania/Manyara, Region/Simanjiro, Distrikt/Merelani (Mererani)
Mineral: Merelaniite
Image: 1480437563
Rating: 10 (votes: 1)
License: Creative Commons - Attribution (CC-BY) V.3.0
Quartz crystal with inclusions of merelaniite

Optical photographs of (a) 2.8-cm-tall quartz crystal with inclusions of merelaniite whiskers, also associated with chabazite crystals; (b) close-up of (a) showing merelaniite, graphite and an unid...
Copyright: John A. Jaszczak
Contribution: Stefan 2016-11-29
Locality: Merelani (Mererani) / Simanjiro, Distrikt / Manyara, Region / Tansania

Collectors Summary

Color dunkelgrau
Streak color dunklgrau bis schwarz
Lustre Metallglanz
Hardness (Mohs) im Moment nicht zu ermitteln
Cleavages vollkommen {001}
Fracture splitrig
Crystal System triklin, C1, C1
Morphology zylindrische Barthaare zehntel von Mikrometer im Durchmesser bis 1 mm lang

Additional information / Summary

Eine Arsen reiche Variante wurde auch berichtet.

Die komplette Merelaniite-Analyse kann unter der CC-BY 4.0 Lizenz hier abgerufen werden (ca. 40 MB).

Chemism

Chemical formula

Mo4Pb4VSbS15

Empirical formula (analysis)

Mo4.33Pb4.00As0.10V0.86Sb0.43Bi0.33Mn0.05W0.05Cu0.03(S14.70Se0.30)Σ15

Chemical composition

Antimon, Blei, Molybdän, Schwefel, Vanadium

Unit weight: 1925.788179355 u; Number of atoms in the formula: 25.18

Info

Empirical formula:

Mo4.33Pb4.00As0.10V0.86Sb0.43Bi0.33Mn0.05W0.05Cu0.03(S14.70Se0.30)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Sulfur

S

24.48

14.7

58.38

32.0655000

471.3628500
Vanadium

V

2.27

0.86

3.42

50.9415100

43.8096986
Manganese

Mn

0.14

0.05

0.20

54.9380499

2.7469025
Copper

Cu

0.10

0.03

0.12

63.5463000

1.9063890
Arsenic

As

0.39

0.1

0.40

74.9216020

7.4921602
Selenium

Se

1.23

0.3

1.19

78.9630000

23.6889000
Molybdenum

Mo

21.57

4.33

17.20

95.9420000

415.4288600
Antimony

Sb

2.72

0.43

1.71

121.7601000

52.3568430
Tungsten

W

0.48

0.05

0.20

183.8410000

9.1920500
Lead

Pb

43.04

4

15.89

207.2100000

828.8400000
Bismuth

Bi

3.58

0.33

1.31

208.9803820

68.9635261

Analysis wt%

S : 24.05
V : 2.26
Mn : 0.05
As : 0.39
Mo : 21.10
Sb : 2.59
W : 0.55
Pb : 42.40
Se : 1.25
Bi : 3.56
Cu : 0.01
Total : 98.20

Strunz 9th edition incl. updates

2.HF.25a

2: Sulfide und Sulfosalze (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide, Sulfoarsenide, Sulfoantimonide, Sulfobismuthide)
H: Sulfosalze mit SnS als Vorbild
F: Mit SnS und PbS archetyp strukturellen Einheiten
25a:

Lapis Classification

II/C.17-110

II: SULFIDE UND SULFOSALZE (Sulfide, Selenide, Telluride, Arsenide, Antimonide, Bismutide)
C: Sulfide mit Metall : S,Se,Te ~ 1:1

IMA status

anerkannt - CNMNC Newsletter No. 33, Oktober 2016

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Cylindrite group

Optical Properties

Color

dunkelgrau

Streak color

dunklgrau bis schwarz

Change in color

Polierte Flächen von Merelaniit sind in reflektiertem Licht grau bis weiß in der Farbe

Diaphaneity (Transparency)

opak

Lustre

Metallglanz

Pleochroism

schwach

Bireflectance

stark

Anisotropism

starkmit blass blau bis orange-braunen - Rotations-Farbtönen

Reflectivity: (Lambda nm) ↓, ↑, Ø

(400) 37.60, 47.60, 42.60
(420) 37.40, 47.20, 42.30
(440) 37.20, 46.80, 42.00
(460) 36.90, 46.50, 41.70
(470) 36.80, 46.30, 41.55
(480) 36.60, 46.10, 41.35
(500) 36.30, 45.70, 41.00
(520) 36.00, 45.10, 40.55
(540) 35.70, 44.40, 40.05
(546) 35.60, 44.10, 39.85
(560) 35.40, 43.50, 39.45
(580) 35.00, 42.70, 38.85
(589) 34.80, 42.30, 38.55
(600) 34.60, 41.80, 38.20
(620) 34.40, 41.00, 37.70
(640) 34.30, 40.20, 37.25
(650) 34.30, 39.90, 37.10
(660) 34.20, 39.60, 36.90
(680) 34.10, 39.20, 36.65
(700) 34.00, 39.00, 36.50
Reflection chart Merelaniite

Reflectivity Ø

39.51

Optical Data Luminescence

Luminescence

keine Fluoreszent

Image ⇒ Analyses data ⇒ Raman spectrum (1 Images total)

Merelaniit representative Raman spectra
Views (File:
1480438157
): 360
Merelaniit representative Raman spectra
Representative Raman spectra, independently scaled and vertically shifted for clarity, from the surface of sample 3323, and from polished samples 3666ax2 and 3666cr2 using 633-nm and 785-nm incident radiation. The “3666cr2 middle” spectrum was taken from a region of the cross section shown in Figure 7 midway between the center and the surface. Spectra “3666ax2 rim” and “3666ax2 core” were taken from the longitudinal section of the whisker shown in Figure 6 from regions between the axis and the surface (rim), and from the brightly reflecting core, respectively. John A. Jaszczak, Michael S. Rumsey, Luca Bindi, Stephen A. Hackney, Michael A.Wise, Chris J. Stanley and John Spratt
Copyright: John A. Jaszczak; Contribution: Stefan
Mineral: Merelaniite
Image: 1480438157
License: Creative Commons - Attribution (CC-BY) V.3.0
Merelaniit representative Raman spectra

Representative Raman spectra, independently scaled and vertically shifted for clarity, from the surface of sample 3323, and from polished samples 3666ax2 and 3666cr2 using 633-nm and 785-nm inciden...
Copyright: John A. Jaszczak
Contribution: Stefan 2016-11-29

Crystallography

Crystal System

triklin

Class (H-M)

1, 1

Space Group number

1, 2

Space Group

C1, C1

Crystal structure

Gitterparameter für den Q-Layer:

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); V = 425(2) Å3; und Z = 4.

Gitterparameter für den H-Layer:

a = 5.547(9) Å; b = 3.156(4) Å; c = 11.91(1) Å; α = 89.52(9); β = 92.13(5); γ = 90.18(4); V = 208(2) Å3; und Z = 2

X-Ray Powder Diffraction

6.14(30),
5.94(60),
2.968(25),
2.965(100),
2.272(40),
1.829(30)
XRD chart Merelaniite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Morphology

zylindrische Barthaare zehntel von Mikrometer im Durchmesser bis 1 mm lang

Physical Properties

Hardness (Mohs)

im Moment nicht zu ermitteln

Density (g/cm³)

4.895 (berechnet) (Q-Layer-Volumen + H-Layer-Volumen, Z = 1)

Cleavages

vollkommen {001}

Fracture

splitrig

Tenacity

formbar, flexibel

(Co-)Type locality

(Co-)Type locality

Tansania/Manyara, Region/Simanjiro, Distrikt/Merelani (Mererani)

Tansania/Manyara, Region/Simanjiro, Distrikt/Merelani (Mererani)/D-Block Mine

Type material

Proben des Holotypus die alle aus Spalten eines einzigen, ungewöhnlich großen (11 cm) Alabanditkristall von Simon Harrison extrahiert wurden (ursprünglich zugeordnete Nummern 3665 und 3666) befinden sich in den Sammlungen des Natural History Museum (London), A. E. Seaman Mineral Museum, das National Museum der Naturwissenschaften des Smithsonian Institution (katalogisiert unter NMNH 177015) und einer der Autoren (JAJ unter den Nummern 3665 und 3666). Die jenigen im Naturhistorischen Museum (London) sind unter BM 2016,100 katalogisiert und umfassen polierte Körner, die in einem Mikrosondenblock eingebettet sind, sowie isolierte Fragmente von "Barthaare", die für die kristallographischen, chemischen und optischen Studien verwendet werden. Jene im A. E. Seaman-Mineralmuseum (katalogisiert unter DM 31323, DM 31324 und DM 31325) umfassen polierte Abschnitte, die in Epoxidhülsen für optische Studien eingebettet sind, sowie eine kleine Gruppe von "Barthaare" mit Graphit. Die für die kristallographischen Röntgenuntersuchungen verwendeten Kristalle werden am Institut für Erdwissenschaften, Universität Florenz, Italien, aufbewahrt. Initiale Raman und chemische Untersuchungen wurden an einem Exemplar in der Sammlung der Smithsonian Institution (temporäre Forschungsnummer 3323, und nun auch unter NMNH 177015 katalogisiert) durchgeführt.

Paragenesis of type material

Zoisit (Varietät Tanzanit), Prehnit, Stilbit, Chabasit, Tremolit, Diopsid, Quarz, Calcit, Graphit, Alabandit, Wurtzit

Preface

Name from

Zu Ehren der lokalen Minenarbeiter wurde das Mineral nach der Lokation benannt.

Author (Name, Year)

J.A. Jaszczak, M.S. Rumsey, L. Bindi, S.A. Hackney, M.A. Wise, C.J. Stanley, and J. Spratt (2016)

References

John A. Jaszczak 1, Michael S. Rumsey, Luca Bindi, Stephen A. Hackney, Michael A. Wise, Chris J. Stanley and John Spratt - Merelaniite, Mo4Pb4VSbS15, a New Molybdenum-Essential Member of the Cylindrite Group, from the Merelani Tanzanite Deposit, Lelatema Mountains, Manyara Region, Tanzania - Minerals 2016, 6(4), 11 http://www.mdpi.com/2075-163X/6/4/115/htm

IMA group assignments

Other languages

German

Merelaniit

English

Merelaniite

Russian

Мереланиит

old name

UM1971-18-S:MoPbSb

Dorian G.W. Smith & Ernest H. Nickel (2007) A System of Codification for Unnamed Minerals: Report of the SubCommittee for Unnamed Minerals of the IMA Commission on New Minerals, Nomenclature and Classification. Canadian Mineralogist v. 45, p.983-1055

UM1982-13-S:MoPb

Dorian G.W. Smith & Ernest H. Nickel (2007) A System of Codification for Unnamed Minerals: Report of the SubCommittee for Unnamed Minerals of the IMA Commission on New Minerals, Nomenclature and Classification. Canadian Mineralogist v. 45, p.983-1055

CNMNC (IMA)-Number

IMA 2016-042

CNMNC symbol

Symbol

Ml

Locations with GPS information

IDs

GUSID (Global unique identifier short form) 4zLU1n0-00SFpHiTEMo33w
GUID (Global unique identifier) D6D432E3-3E7D-44D3-85A4-789310CA37DF
Database ID 8188