Mineralogy Database

Holdawayite Mineral Data

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General Holdawayite Information

Help on Chemical  Formula: Chemical Formula: Mn++6(CO3)2(OH)7(Cl,OH)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Mn2+6(CO3)2(OH)7.25Cl0.75
Help on IMA Status: IMA Status: Approved IMA 1988
Help on Locality: 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.
Help on Name Origin: Name Origin: Named for Michael J. Holdaway of Southern Methodist University.
Help on Name Pronunciation: Name Pronunciation: Holdawayite + Pronunciation Say HOLDAWAYITE
Help on Synonym: Synonym: ICSD 202600
  PDF 46-1299

Holdawayite Image

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

Holdawayite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =7.0727:1:5.0149
Help on Cell Dimensions: Cell Dimensions: a = 23.437, b = 3.3137, c = 16.618, Z = 4; beta = 111.15° V = 1,203.67 Den(Calc)= 3.31
Help on Crystal System: 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/Io): 10.93(1), 5.459(0.8), 3.879(0.7),

Physical Properties of Holdawayite

Help on Color: Color: Pink, Light pink.
Help on Density: Density: 3.19
Help on Diaphaneity: Diaphaneity: Translucent
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: light pink

Optical Properties of Holdawayite

Help on Gladstone-Dale: 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
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.06 gm/cc
note: Specific Gravity of Holdawayite =3.19 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0006122939
Boson Index = 0.9993877061
Help on Photoelectric: Photoelectric: PEHoldawayite = 14.50 barns/electron
U=PEHoldawayite x rElectron Density= 44.45 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Holdawayite is Not Radioactive

Holdawayite Classification

Help on  Dana Class: Dana Class: 16b.04.02.02 (16b)Carbonates - Hydroxyl or Halogen
  (16b.04)where (A)m (B)n (XO3)p Zq � 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
Help on  Strunz Class: 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

Help on References: 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)
Help on See Also: 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

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Dana No: 16b.04.02.02 Strunz No: 05.BA.20





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