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Holdawayite

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Kombat Mine, Kombat, Grootfontein District, Otjozondjupa Region, Namibia
© 2008, J. Weissman

Formula:
Mn
 
6
(CO
 
3
)
 
2
(OH)
 
7
(Cl,OH)
System:MonoclinicHardness:3
Name:For US petrologist, Michael Jon Holdaway (b. 1936).
This page provides mineralogical data about Holdawayite.

Classification of Holdawayite

IMA status:Approved 1986
Strunz 8th edition ID:5/C.06-20
Nickel-Strunz 10th (pending) edition ID:5.BA.20

5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
A : With Cu, Co, Ni, Zn, Mg, Mn
Dana 8th edition ID:16b.4.2.2

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
4 : AmBn(XO3)pZqxH2O & with (m+n):p = 3:1
Hey's CIM Ref.:11.12.2

11 : Carbonates
12 : Carbonates of Mn
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Type Occurrence of Holdawayite

Type Locality:Kombat Mine, Kombat, Grootfontein District, Otjozondjupa Region, Namibia
Year of Discovery:1988

Physical Properties of Holdawayite

Hardness (Mohs):3

Crystallography of Holdawayite

Crystal System:Monoclinic
Cell Parameters:a = 23.43Å, b = 3.31Å, c = 16.61Å
β = 111.15°
Ratio:a:b:c = 7.079 : 1 : 5.018
Unit Cell Volume:V 1,201.39 ų (Calculated from Unit Cell)

Optical Data of Holdawayite

Type:Biaxial (-)
RI values: nα = 1.644 nβ = 1.719 nγ = 1.721
2V:Measured: 12° to 18°, Calculated: 16°
Maximum Birefringence:δ = 0.077

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:relatively strong

Chemical Properties of Holdawayite

Formula:
Mn
 
6
(CO
 
3
)
 
2
(OH)
 
7
(Cl,OH)
Essential elements:C, Cl, H, Mn, O
All elements listed in formula:C, Cl, H, Mn, O

Relationship of Holdawayite to other Species

Related Minerals - Nickel-Strunz Grouping):
5.BA.05Azurite
Cu
 
3
[OH|CO
 
3
]
 
2
5.BA.10Georgeite
Cu
 
2
[(OH)
 
2
|CO
 
3
] · 6H
 
2
O
5.BA.10Glaukosphaerite
(Cu,Ni)
 
2
[(OH)
 
2
|CO
 
3
]
5.BA.10Kolwezite
(Cu,Co)
 
2
[(OH)
 
2
|CO
 
3
]
5.BA.10Malachite
Cu
 
2
[(OH)
 
2
|CO
 
3
]
5.BA.10Mcguinnessite
(Mg,Cu)
 
2
[(OH)
 
2
|CO
 
3
]
5.BA.10Nullaginite
Ni
 
2
[(OH)
 
2
|CO
 
3
]
5.BA.10Pokrovskite
Mg
 
2
[(OH)
 
2
|CO
 
3
]
5.BA.10Rosasite
(Cu,Zn)
 
2
[(OH)
 
2
|CO
 
3
]
5.BA.10Zincrosasite
(Zn,Cu)
 
2
[(OH)
 
2
|CO
 
3
]
5.BA.10Chukanovite
Fe
2+
2
[(OH)
 
2
|CO
 
3
]
5.BA.15Aurichalcite
(Zn,Cu)
 
5
[(OH)
 
3
|CO
 
3
]
 
2
5.BA.15Hydrozincite
Zn
 
5
[(OH)
 
3
|CO
 
3
]
 
2
5.BA.25Defernite
Ca
 
6
(CO
 
3
)
 
2-x
(SiO
 
4
)
 
x
(OH)
 
7
(Cl,OH)
 
1-2x
 (x=0.5)
5.BA.30Loseyite
(Zn,Mn
2+
 
)
 
7
[(OH)
 
5
|CO
 
3
]
 
2
5.BA.30Sclarite
(Zn,Mg,Mn
2+
 
)
 
4
Zn
 
3
[(OH)
 
5
|CO
 
3
]
 
2
Related Minerals - Hey's Index Grouping:
11.12.1Rhodochrosite
MnCO
 
3
11.12.3Desautelsite
Mg
 
6
Mn
3+
2
[(OH)
 
16
|CO
 
3
] · 4H
 
2
O
11.12.4Kutnohorite
Ca(Mn,Mg,Fe)(CO
 
3
)
 
2

Other Names for Holdawayite

Synonyms:
IMA1986-001
German names:
Holdawayit
Russian names:
Холдавейит
Spanish names:
Holdawayita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Holdawayite

Reference List:American Mineralogist: 37: 637-642.

American Mineralogist: 73: 632-643.

Internet Links for Holdawayite

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  • Raman and XRD data at RRUFF project
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  • Holdawayite details from Handbook of Mineralogy (PDF)
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    Localities for Holdawayite

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    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Germany
     
    • Rhineland-Palatinate
      • Lahn valley
    		Wittern: "Mineralfundorte in Deutschland", 2001
    Namibia
     
    • Otjozondjupa Region
      • Grootfontein District
        • Kombat
    		American Mineralogist (1988): 73: 632-642.
    Mineral and/or Locality
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