Mammothite Mineral Data

General Mammothite Information

Chemical Formula:

Pb6Cu4AlSb+++++O2(SO4)2Cl4(OH)16

Composition:

Molecular Weight = 2,284.17 gm

Aluminum 1.18 % Al 2.23 % Al₂O₃

Copper 11.13 % Cu 13.93 % CuO

Antimony 5.33 % Sb 7.08 % Sb₂O₅

Hydrogen 0.71 % H 6.31 % H₂O

Lead 54.43 % Pb 58.63 % PbO

Sulfur 2.81 % S 7.01 % SO₃

Chlorine 6.21 % Cl 6.21 % Cl

- % Cl -1.40 % -O=Cl₂

Oxygen 18.21 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Pb₆Cu₄AlSbO₂(SO₄)₂Cl₄(OH)₁₆

Environment:

Secondary lead mineral.

IMA Status:

Approved IMA 1985

Locality:

Mammoth vein, Tiger, Arizona, USA and from Laurium, Attika, Greece. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Mammothite + Pronunciation

Synonym:

ICSD 30992

PDF 38-389

Mammothite Image

Images:

Mammothite

Comments: Sparse blue crystalline mammothite in slag.
Location: Laurium, Attiki, Greece. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Mammothite Crystallography

Axial Ratios:

a:b:c =2.5825:1:1.573

Cell Dimensions:

a = 18.933, b = 7.331, c = 11.532, Z = 2; beta = 112.43° V = 1,479.52 Den(Calc)= 5.13

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.896(1), 6.67(0.9), 4.72(0.8),

Physical Properties of Mammothite

Cleavage:

{010} Distinct

Color:

Bright blue, Greenish blue, Pale blue.

Density:

5.25

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

3 - Calcite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

pale blue

Optical Properties of Mammothite

Gladstone-Dale:

CI meas= 0 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1747,KPDmeas= 0.1707,KC= 0.1706
Ncalc = 1.88 - 1.9

Optical Data:

Biaxial (+), a=1.868, b=1.892, g=1.928, bire=0.0600, 2V(Calc)=80, 2V(Meas)=80.

Pleochroism (x):

pale blue.

Pleochroism (y):

blue.

Pleochroism (z):

blue.

Calculated Properties of Mammothite

Electron Density:

Bulk Density (Electron Density)=4.58 gm/cc
note: Specific Gravity of Mammothite =5.25 gm/cc.

Fermion Index:

Fermion Index = 0.12
Boson Index = 0.88

Photoelectric:

PE_Mammothite= 982.10 barns/electron
U=PE_Mammothite x rElectron Density=4,496.54 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mammothite is Not Radioactive

Mammothite Classification

Dana Class:

30.01.14.01 (30)Anhydrous Sulfates Containing Hydroxyl or Halogen

(30.01)where (A B)m (XO4)p Zq where m:p>2:1

(30.01.14)Dana Group

30.01.14.01 Mammothite Pb6Cu4AlSbO2(SO4)2Cl4(OH)16 C 2/m 2/m

Strunz Class:

07.BC.60 07 - SULFATES (SELENATES, TELLURATES)

07.B - Sulfates (selenates, etc.) with Additional Anions, without H2O

07.BC -With medium-sized and large cations

07.BC.60 Mammothite Pb6Cu4AlSbO2(SO4)2Cl4(OH)16 C 2/m 2/m

Other Mammothite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Mammothite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - WWW-MINCRYST

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Mammothite

Pb6Cu4AlSb+++++O2(SO4)2Cl4(OH)16
Dana No: 30.01.14.01 Strunz No: 07.BC.60
Locality:

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