Holdawayite Mineral Data

Holdawayite Mineral Data +

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General Holdawayite Information

Chemical Formula:

Mn++6(CO3)2(OH)7(Cl,OH)

Composition:

Molecular Weight = 599.54 gm

Manganese 54.98 % Mn 70.99 % MnO

Hydrogen 1.22 % H 10.89 % H₂O

Carbon 4.01 % C 14.68 % CO₂

Chlorine 4.43 % Cl 4.43 % Cl

- % Cl -1.00 % -O=Cl₂

Oxygen 35.36 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺₆(CO₃)₂(OH)_7.25Cl_0.75

IMA Status:

Approved IMA 1988

Locality:

11 level of the Asis West sector of the Kombat mine, located 37 km east of Otavi and 49 km south of Tsumeb in the north-central part of Namibia. Link to MinDat.org Location Data.

Name Origin:

Named for Michael J. Holdaway of Southern Methodist University.

Synonym:

ICSD 202600

PDF 46-1299

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Holdawayite Crystallography

Axial Ratios:

a:b:c =7.0727:1:5.0149

Cell Dimensions:

a = 23.437, b = 3.3137, c = 16.618, Z = 4; beta = 111.15° V = 1,203.67 Den(Calc)= 3.31

Crystal System:

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

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

By Intensity(I/I_o): 10.93(1), 5.459(0.8), 3.879(0.7),

Crystal Structure:

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Peacor D R , Rouse R C , American Mineralogist , 73 (1988) p.637-642, Holdawayite, Mn6(CO3)2(OH)7(Cl,OH), a structure containing anions in, zeolite-like channels

Physical Properties of Holdawayite

Color:

Pink, Light pink.

Density:

3.19

Diaphaniety:

Translucent

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

light pink

Optical Properties of Holdawayite

Gladstone-Dale:

CI meas= 0.019 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.054 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2099,KPDmeas= 0.2178,KC= 0.2219

Optical Data:

Biaxial (-), a=1.644, b=1.719, g=1.721, bire=0.0770, 2V(Calc)=16, 2V(Meas)=12-18.

Calculated Properties of Holdawayite

Electron Density:

r_electron=3.06 gm/cc
note: r_Holdawayite=3.19 gm/cc.

Fermion Index

Fermion Index = 0.00061
Boson Index = 0.99939

Photoelectric:

PE_Holdawayite= 14.50 barns/electron
U=PE_Holdawayite x r_electron= 44.45 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Holdawayite is Not Radioactive

Holdawayite Classification

Dana Class:

16b.4.2.2 (16b)Carbonates - Hydroxyl or Halogen

(16b.4)where (A)m (B)n (XO3)p Zq · x(H2O), with (m+n):p=8:1

(16b.4.2)Dana Group

16b.4.2.1 Defernite Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x(x=0,5) Pnam 2/m 2/m 2/m

16b.4.2.2 Holdawayite Mn6(CO3)2(OH)7(Cl,OH) C 2/m 2/m

Strunz Class:

V/C.06-20 V - Nitrates, Carbonates and Borates

V/C - Waterfree carbonates with unfamiliar anions

V/C.06 - Brenkite - Defernite series

V/C.06-10 Brenkite Ca2(CO3)F2 P bcn 2/m 2/m 2/m

V/C.06-20 Holdawayite Mn6(CO3)2(OH)7(Cl,OH) C 2/m 2/m

V/C.06-25 Rouvilleite Na3Ca2(CO3)3F Cc,C 2/c Mono

V/C.06-27 Sheldrickite! NaCa3(CO3)2F3·(H2O) P 3₂ 3

V/C.06-30 Defernite Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x(x=0,5) Pnam 2/m 2/m 2/m

Other Holdawayite Information

References:

NAME( MinRec, v 22, p 422.) PHYS. PROP.(Am.Min.,Vol.73,p632-636,1988) OPTIC PROP.(Am.Min.,Vol.73,p632-636,1988)

See Also:

Links to other databases for Holdawayite :
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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Print or Cut-and-Paste your Holdawayite Specimen Label here :

Holdawayite

Mn++6(CO3)2(OH)7(Cl,OH)
Dana No: 16b.4.2.2 Strunz No: V/C.06-20
Locality:

Notes: