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Holtedahlite

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Olaf Holtedahl
Formula:
Mg12(PO3OH,CO3)(PO4)5(OH,O)6
System:
Trigonal
Colour:
Colorless
Lustre:
Vitreous
Hardness:
4½ - 5
Name:
First mentioned in Raade & Tysseland (1975) as "an unidentified Ca-Mg-phosphate". First described by Raade & Mladeck (1979).

Named in honor of Olaf Holtedahl (24 June 1885, Oslo, Norway - 28 August 1975), professor of geology at the University of Oslo. He was the recipient of the Wollastone Medal of the Geological Society of London and the Leopold von Buch Medal from Deutsche Geologische Gesellschaft.
Occurs as irregular masses and patches. It's very difficult to visually distinguish between holtedahlite and the associated apatite. It typically contains inclusions of small magnetite grains which may impart a greyish color to it (Raade & Mladeck 1979)


Classification of Holtedahlite

Approved
First Published:
1979
8.BB.20

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
B : With only medium-sized cations, (OH, etc.):RO4 about 1:1
41.6.4.2

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
6 : A2(XO4)Zq
19.3.15

19 : Phosphates
3 : Phosphates of Be and Mg

Physical Properties of Holtedahlite

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Colorless
Hardness (Mohs):
4½ - 5
Cleavage:
None Observed
Shows no cleavage
Fracture:
Irregular/Uneven

Optical Data of Holtedahlite

Type:
Uniaxial (-)
RI values:
nω = 1.599 nε = 1.597
Max Birefringence:
δ = 0.002
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of Holtedahlite

IMA Formula:
Mg12(PO3OH,CO3)(PO4)5(OH,O)6
Elements listed in formula:

Crystallography of Holtedahlite

Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
P3 1m
Cell Parameters:
a = 11.203(3) Å, c = 4.977(1) Å
Ratio:
a:c = 1 : 0.444
Unit Cell Volume:
V 540.96 ų (Calculated from Unit Cell)
Morphology:
Occured as masses and irregular patches, no external form has been observed
Comment:
Rømming & Raade (1989),

Type Occurrence of Holtedahlite

General Appearance of Type Material:
Colorless masses and patches intimately associated with althausite and apatite
Place of Conservation of Type Material:
The Natural History Museum in Oslo
Geological Setting of Type Material:
Serpentinite-magnesite depoposite
Associated Minerals at Type Locality:

Relationship of Holtedahlite to other Species

Common Associates:
8.BB.XArsenowagneriteMg2AsO4F
8.BB.05AmblygoniteLiAlPO4F
8.BB.05MontebrasiteLiAlPO4(OH)
8.BB.05TavoriteLiFe3+PO4(OH)
8.BB.10Triplite(Mn2+,Fe2+)2PO4(F,OH)
8.BB.10ZwieseliteFe2+Mn2+PO4F
8.BB.15SarkiniteMn22+AsO4(OH)
8.BB.15TriploiditeMn22+(PO4)(OH)
8.BB.15WagneriteMg2PO4F
8.BB.15WolfeiteFe22+PO4(OH)
8.BB.15StanĕkiteFe3+Mn2+O(PO4)
8.BB.15JoosteiteMn2+Mn3+O(PO4)
8.BB.15HydroxylwagneriteMg2PO4(OH)
8.BB.20Satterlyite(Fe2+,Mg,Fe3+)12(PO3OH)(PO4)5(OH,O)6
8.BB.25AlthausiteMg4(PO4)2(OH,O)(F,◻)
8.BB.30AdamiteZn2AsO4(OH)
8.BB.30EveiteMn22+AsO4(OH)
8.BB.30LibetheniteCu2PO4(OH)
8.BB.30OliveniteCu2AsO4(OH)
8.BB.30ZincolibetheniteCuZnPO4OH
8.BB.30ZincoliveniteCuZnAsO4(OH)
8.BB.30AuriacusiteFe3+Cu2+AsO4O
8.BB.35ParadamiteZn2AsO4(OH)
8.BB.35TarbuttiteZn2(PO4)(OH)
8.BB.40BarbosaliteFe2+Fe23+(PO4)2(OH)2
8.BB.40HentscheliteCuFe23+(PO4)2(OH)2
8.BB.40LazuliteMgAl2(PO4)2(OH)2
8.BB.40ScorzaliteFe2+Al2(PO4)2(OH)2
8.BB.40WilhelmkleiniteZnFe23+(AsO4)2(OH)2
8.BB.45TrolleiteAl4(PO4)3(OH)3
8.BB.50NamibiteCu(BiO)2VO4(OH)
8.BB.55Phosphoellenbergerite(Mg,◻)2Mg12(PO4,PO3OH)6(PO3OH,CO3)2(OH)6
8.BB.60UrusoviteCuAlO(AsO4)
8.BB.65TheoparacelsiteCu3(OH)2As2O7
8.BB.70TuraniteCu52+(VO4)2(OH)4
8.BB.75StoiberiteCu5O2(VO4)2
8.BB.80FingeriteCu11O2(VO4)6
8.BB.85AverieviteCu5O2(VO4)2 · CuCl2
8.BB.90LipscombiteFe2+Fe23+(PO4)2(OH)2
8.BB.90RichelliteCaFe23+(PO4)2(OH,F)2
8.BB.90ZinclipscombiteZnFe23+(PO4)2(OH)2
19.3.1MoraesiteBe2PO4(OH) · 4H2O
19.3.2BerylloniteNaBePO4
19.3.3HurlbutiteCaBe2P2O8
19.3.4HydroxylherderiteCaBe(PO4)(OH)
19.3.5GlucineCaBe4(PO4)2(OH)4 · 0.5H2O
19.3.6FransoletiteCa3Be2(PO4)2(PO3OH)2 · 4H2O
19.3.7UraloliteCa2Be4(PO4)3(OH)3 · 5H2O
19.3.9PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2O
19.3.10TiptopiteK2(Li,Na,Ca)6(Be6P6)O24(OH)2 · 1.3H2O
19.3.11GainesiteNa2(Be,Li)Zr2(PO4)4 · 1.5H2O
19.3.12RoscheriteCa2Mn52+Be4(PO4)6(OH)4 · 6H2O
19.3.13FaheyiteBe2Mn2+Fe23+(PO4)4 · 6H2O
19.3.14FarringtoniteMg3(PO4)2
19.3.16AlthausiteMg4(PO4)2(OH,O)(F,◻)
19.3.17NewberyiteMg(PO3OH) · 3H2O
19.3.18PhosphorrössleriteMg(PO3OH) · 7H2O
19.3.19BobierriteMg3(PO4)2 · 8H2O
19.3.20Barićite(Mg,Fe)3(PO4)2 · 8H2O
19.3.21Panethite(Na,Ca,K)1-x(Mg,Fe2+,Mn)PO4
19.3.22Dittmarite(NH4)MgPO4 · H2O
19.3.23Struvite(NH4)MgPO4 · 6H2O
19.3.24Hannayite(NH4)2Mg3(PO3OH)4 · 8H2O

Other Names for Holtedahlite

Name in Other Languages:

Other Information

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

References for Holtedahlite

Reference List:
Raade, G., Tyssedal, M. (1975) Althausite, a new mineral from Modum, Norway. Lithos: 8: 215-219. [as an unidentified Ca-Mg-phospate]

Raade, G., Mladeck, M.H. (1979) Holtedahlite, a new magnesium phosphate from Modum, Norway. Lithos: 12: 283-287.

Fleischer, M., Cabri, L.J., Chao, G.Y., Pabst, A. (1980) New mineral names. American Mineralogist: 65: 808-814.

Rømming, C., Raade, G. (1989) The crystal structure of natural and syntetic holtedahlite. Mineralogy and Petrology: 40: 91-100.

Jambor, J.L., Grew, E.S. (1990) New mineral names. American Mineralogist: 75: 931-937.

Evans, R.J., Groat, L.A. (2012) Structure and topology of dumortierite and dumortierite-like materials. The Canadian Mineralogist: 50: 1197-1231.

Internet Links for Holtedahlite

mindat.org URL:
https://www.mindat.org/min-1924.html
Please feel free to link to this page.

Localities for Holtedahlite

This 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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Norway (TL)
 
  • Buskerud
    • Modum
Raade, G. (1979): Holtedahlite, a new magnesium phospate from Modum, Norway. LITHOS 12, 283-287 + [AmMin 86:1536]
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