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Mereheadite (Mereheadit)

Pictures (1 Images total)

Mereheadit
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1591631434
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Mereheadit
orange Massen von Mereheadit, Merehead Steinbruch (Torr Works), East Cranmore, Somerset, England; BB ~ 4 cm
Copyright: Joy Desor; Contribution: openpit
Location: UK/England/Somerset Co./Cranmore/Torr Works Quarry (Merehead Quarry)
Mineral: Mereheadite
Image: 1591631434
License: Usage for Mineralienatlas project only
Mereheadit

orange Massen von Mereheadit, Merehead Steinbruch (Torr Works), East Cranmore, Somerset, England; BB 4 cm
Copyright: Joy Desor
Contribution: openpit 2020-06-08
Locality: Torr Works Quarry (Merehead Quarry) / Cranmore / Somerset Co. / England / UK

You find additional specimen at the Geolitho Museum

Collectors Summary

Color blass gelb, rötlich orange
Streak color weiß
Lustre Glasglanz, Harzglanz
Hardness (Mohs) 3.5
Cleavages vollkommen {001}
Fracture uneben, muschelig bis hakig
Crystal System monoklin, C2/c

Chemism

Chemical formula

Pb47O24(OH)13Cl25(BO3)2(CO3)

Chemical composition

Blei, Chlor, Bor, Kohlenstoff, Sauerstoff, Wasserstoff

Unit weight: 11407.911271 u; Number of atoms in the formula: 134

Info

Empirical formula:

Pb47O24(OH)13Cl25(BO3)2(CO3)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.11

13

9.70

1.0079470

13.1033110
Boron

B

0.19

2

1.49

10.8117000

21.6234000
Carbon

C

0.11

1

0.75

12.0107800

12.0107800
Oxygen

O

6.45

46

34.33

15.9994300

735.9737800
Chlorine

Cl

7.77

25

18.66

35.4532000

886.3300000
Lead

Pb

85.37

47

35.07

207.2100000

9,738.8700000

Analysis wt%

B2O3 : 0.61, CO2 : 0.38, PbO : 91.96, Cl : 7.77, H2O : 1.03 (Ref: berechnet)

Strunz 9th edition incl. updates

3.DC.45

3: Halide (Fluoride, Chloride, Bromide, Iodide)
D: Oxihalide, Hydroxyhalide und verwandte Doppel-Halide
C: Mit [Pb] ([As], [Sb], [Bi]) ohne [Cu]
45:Mereheadit-Gruppe

Lapis Classification

III/D.10-115

III: HALOGENIDE (Fluoride, Chloride, Bromide, Jodide)
D: Oxihalogenide
10: Oxihalogenide mit Pb-Bi-Sb und verwandte Verbindungen

Classification by Hölzel

7.DN.380

7: SULFATES CHROMATES MOLYBDATES WOLFRAMATES
D: Sulfates (+Anions +Water)
N: Sulfates, C only large

Dana 8th edition

10.04.05.01

10: Oxyhalides and Hydroxyhalides
04: Oxyhalides and Hydroxyhalides where (A)2 (O,OH) Xq

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

blass gelb, rötlich orange

Streak color

weiß

Diaphaneity (Transparency)

durchscheinend

Lustre

Glasglanz, Harzglanz

max. Birefringence

0.035
Birefringence chart\! Mereheadite title=Birefringence chart Mereheadite

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.897

RI value β

1.911

RI value γ / ε

1.932

Ri mean

1.913

2V angle

Biaxial (+) 81°

Reflectivity Ø

14.79

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

15

Space Group

C2/c

Cell parameters a (Å)

17.372

Cell parameters b (Å)

27.9419

Cell parameters c (Å)

10.6661

Cell parameters a/b or c/a

0.622

Cell parameters c/b

0.382

Cell parameters α

90°

Cell parameters β

93.152°

Cell parameters γ

90°

Z

2

Volume (ų)

5169.564

X-Ray Powder Diffraction

6.58(40),
3.785(50),
3.267(30),
2.930(100),
2.825(40),
2.780(40),
2.182(40),
1.980(30)
XRD chart Mereheadite

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

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

3.5

VHN (Hardness Vickers)

171 (10g)

Density (g/cm³)

7.12 - 7.69 / Durchschnittlich = 7.4

7.328 ( ρ calc. Mineralienatlas )

Cleavages

vollkommen {001}

Fracture

uneben, muschelig bis hakig

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

UK/England/Somerset Co./Cranmore/Torr Works Quarry (Merehead Quarry)

Type material

A.E. Fersman Mineralogical Museum, Academy of Sciences, Moskau, Russland

Collection number of type material

76549, 76550

Preface

Author (Name, Year)

Welch & Criddle & Symes, 1998

References

Mineralogical Magazine 62 (1998), 387

Mineralogical Magazine 73 (2009), 103 [Neudefinition, Formel, Struktur]

Other languages

German

Mereheadit

Spanish

Mereheadita

French

Mereheadite

English

Mereheadite

CNMNC (IMA)-Number

IMA 1996-045

CNMNC symbol

Symbol

Mrh

Locations with GPS information

IDs

GUSID (Global unique identifier short form) KR6FsxT5z0OTDgChTmkRuQ
GUID (Global unique identifier) B3851E29-F914-43CF-930E-00A14E6911B9
Database ID 2471