Mannardite Mineral Data

Mannardite Mineral Data +

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General Mannardite Information

Chemical Formula:

BaTi6V+++2O16·(H2O)

Composition:

Molecular Weight = 800.50 gm

Barium 17.16 % Ba 19.15 % BaO

Titanium 35.89 % Ti 59.87 % TiO₂

Vanadium 12.73 % V 18.72 % V₂O₃

Hydrogen 0.25 % H 2.25 % H₂O

Oxygen 33.98 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BaTi₆V³⁺₂O₁₆·(H₂O)

Environment:

In late-stage quartz-carbonate veins cutting shale and siltstone.

IMA Status:

Approved IMA 1986

Locality:

Rough Claims, Sifton Pass, Kechica River, British Columbia, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for George William Mannard (1932-1982), formerly President of Kidd Creek Mines, Ltd., Toronto, Canada.

Synonym:

ICSD 201926

IMA1983-013

PDF 42-615

Mannardite Image

Images:

Mannardite

Comments: Prismatic crystals of black, metallic lustered mannardite crystals in matrix.
Location: Kechica River, British Columbia, Canada. Scale: 3.4 X 4.5 cm.
© John Veevaert

Mannardite Crystallography

Axial Ratios:

a:c = 1:0.41174

Cell Dimensions:

a = 14.356, c = 5.911, Z = 4; V = 1,218.23 Den(Calc)= 4.36

Crystal System:

Tetragonal - DipyramidalH-M Symbol (4/m) Space Group: I 4₁/a

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

By Intensity(I/I_o): 3.201(1), 1.586(0.8), 2.473(0.7),

Crystal Structure:

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Szymanski J T , The Canadian Mineralogist , 24 (1986) p.67-78, The crystal structure of mannardite, a new hydrated cryptomelane-group, (hollandite) mineral with a doubled short axis

Physical Properties of Mannardite

Cleavage:

[100] Good

Color:

Black.

Density:

4.12 - 4.43, Average = 4.27

Diaphaniety:

Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

7 - Quartz

Luster:

Adamantine

Streak:

gray white

Optical Properties of Mannardite

Optical Data:

Uniaxial (+).

NCalc= 2.39 - from Gladstone-Dale relationship (KC = 0.3197) where Ncalc=Dcalc*KC+1
NCalc= 2.37 - from Gladstone-Dale relationship (KC = 0.3197) where Ncalc=Dmeas*KC+1

RL Anisotrophism:

Strong, light pinkish gray to dark brownish gray.

RL Bireflectance:

Distinct, light to dark brown.

RL Color:

Pale reddish brown.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Mannardite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	16.50	18.00
420 nm	16.30	17.60
440 nm	16.00	17.20
460 nm	15.70	17.00
480 nm	15.50	16.90
500 nm	15.40	17.00
520 nm	15.20	17.20
540 nm	15.10	17.40
560 nm	15.00	17.70
580 nm	15.00	17.90
600 nm	15.00	18.10
620 nm	15.00	18.30
640 nm	15.00	18.40
660 nm	15.00	18.50
680 nm	15.10	18.60
700 nm	15.10	18.60

**Calculated Relative Intensity Colors of Mannardite in Air**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	540%	580%
R₁
R₂

Calculated Properties of Mannardite

Electron Density:

r_electron=4.05 gm/cc
note: r_Mannardite=4.36 gm/cc.

Fermion Index

Fermion Index = 0.07745
Boson Index = 0.92255

Photoelectric:

PE_Mannardite= 82.64 barns/electron
U=PE_Mannardite x r_electron= 334.87 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Mannardite is Not Radioactive

Mannardite Classification

Dana Class:

7.9.5.1 (7)Multiple Oxides

(7.9)where A B (O)2

(7.9.5)Dana Group

7.9.5.1 Mannardite BaTi6V2O16·(H2O) I 4₁/a 4/m

7.9.5.2 Redledgeite BaTi6Cr2O16·(H2O) I 4₁/a 4/m

Strunz Class:

IV/D.08-40 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.08 - Cryptomelane group

IV/D.08-10 Manjiroite (Na,K)(Mn,Mn)8O16·n(H2O) I 4/m 4/m

IV/D.08-20 Cryptomelane K(Mn,Mn)8O16 I2/m 2/m

IV/D.08-25 Strontiomelane! SrMn6Mn2O16 P 2₁/m 2/m

IV/D.08-30 Priderite (K,Ba)(Ti,Fe)8O16 I 4/m 4/m

IV/D.08-33 Henrymeyerite! BaFeTi7O16 I 4/m 4/m

IV/D.08-35 Ankangite Ba(Ti,V,Cr)8O16 I 4/m 4/m

IV/D.08-40 Mannardite BaTi6V2O16·(H2O) I 4₁/a 4/m

IV/D.08-50 Redledgeite BaTi6Cr2O16·(H2O) I 4₁/a 4/m

IV/D.08-60 Hollandite Ba(Mn,Mn)8O16 I2/m 2/m

IV/D.08-70 Coronadite Pb(Mn,Mn)8O16 I2/m 2/m

IV/D.08-80 Cesarolite PbH2Mn3O8 HEX-R Trig

Other Mannardite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Mannardite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Mannardite

BaTi6V+++2O16·(H2O)
Dana No: 7.9.5.1 Strunz No: IV/D.08-40
Locality:

Notes: