Holdawayite Mineral Data

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.

Name Pronunciation:

Holdawayite + Pronunciation

Synonym:

ICSD 202600

PDF 46-1299

Holdawayite Image

Images:

Holdawayite

Comments: Compact platy crystalline holdawayite. Colorless when thin, but brown when thick.
Location: Kombat, Namibia. Scale: See Image.
© Rruff Database

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 - Prismatic H-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),

Physical Properties of Holdawayite

Color:

Pink, Light pink.

Density:

3.19

Diaphaneity:

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
Ncalc = 1.71 - 1.73

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:

Bulk Density (Electron Density)=3.06 gm/cc
note: Specific Gravity of Holdawayite =3.19 gm/cc.

Fermion Index:

Fermion Index = 0.0006122939
Boson Index = 0.9993877061

Photoelectric:

PE_Holdawayite= 14.50 barns/electron
U=PE_Holdawayite x rElectron Density= 44.45 barns/cc.

Radioactivity:

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

Holdawayite Classification

Dana Class:

16b.04.02.02 (16b)Carbonates - Hydroxyl or Halogen

(16b.04)where (A)m (B)n (XO3)p Zq ï¿½ x(H2O), with (m+n):p=8:1

(16b.04.02)Dana Group

16b.04.02.01 Defernite Ca6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x(x=0,5) Pnam 2/m 2/m 2/m

16b.04.02.02 Holdawayite Mn6(CO3)2(OH)7(Cl,OH) C 2/m 2/m

Strunz Class:

05.BA.20 05 - CARBONATES (NITRATES)

05.B - Carbonates with additional anions, without H2O

05.BA -With Cu, Co, Ni, Zn, Mg, Mn

05.BA.20 Holdawayite Mn6(CO3)2(OH)7(Cl,OH) C 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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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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.04.02.02 Strunz No: 05.BA.20
Locality:

Notes:

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