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Merelaniite

Pictures (9 Images total)

Merelaniite, Tremolite, Prehnite, Chabazite, Graphite, Calcite
Views (Image: 1477698403): 1270
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 2016-10-29
Locality: Merelani (Mererani) / Simanjiro, Distrikt / Manyara, Region / Tansania
Merelaniite
Views (Image: 1480437438): 883
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 (Image: 1480437673): 434
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 (Image: 1480436152): 530
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 (Image: 1480437563): 338
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
Merelaniit
Views (Image: 1480437807): 206
Merelaniit

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

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, Sulfarsenite, Sulfantimonite, Sulfbismuthite)
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 ⇒ Raman spectrum (1 Images total)

Merelaniit representative Raman spectra
Views (Image: 1480438157): 270
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

Kristall 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

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Merelaniite

Mo4Pb4VSbS15

triklin : 1, 1 : C1, C1

2.HF.25a

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Herzenbergite

SnS

orthorhombisch : mmm : Pbnm

II/C.17-010

Stistaite

SnSb

II/C.17-020

Mohite

Cu2SnS3

monoklin : m : Cc

II/C.17-030

Teallite

PbSnS2

orthorhombisch : mmm : Pbnm

II/C.17-040

Suredaite

PbSnS3

orthorhombisch : mmm : Pnma

II/C.17-045

Lévyclaudite

Pb8Sn7Cu3(Bi,Sb)3S28

II/C.17-055

Coiraite

(Pb,Sn)12.5Sn5FeAs3S28

II/C.17-065

Franckeite

Pb21.7Sn9.3Fe4.0Sb8.1S56.9

triklin : 1 : C1

II/C.17-070

Cylindrite

Pb3Sn4FeSb2S14

II/C.17-080

Abramovite

Pb2SnInBiS7

triklin : 1 : P1

II/C.17-090

Merelaniite

Mo4Pb4VSbS15

triklin : 1, 1 : C1, C1

II/C.17-110

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

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

DeWikiPedia - search for: Merelaniit
Google-Bilder-Suche - search for: Merelaniit
Mineralogisch-Petrographisches-Institut Hamburg - search for: Merelaniit

English pages

Mindat - search for: Merelaniite
Webmineral - search for:Merelaniite
Handbook-of-Mineralogy - search for: Merelaniite
RRUFF - Raman, XRD and other mineral data - search for: Merelaniite
RRUFF - References and PDF downloads - search for: Merelaniite
American-Mineralogist-Crystal-Structure-Database - search for: Merelaniite
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Russian pages

Webmineral.ru - search for: Мереланиит

Mineral Dealer

German pages

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Locations with GPS information