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Holtedahlite

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Holtedahlite, etc.

Tingelstadtjern Quarry, Modum, Buskerud, Norway
Holtedahlite, etc.

Tingelstadtjern Quarry, Modum, Buskerud, Norway
Holtedahlite

Tingelstadtjern Quarry, Modum, Buskerud, Norway
Holtedahlite, etc.

Tingelstadtjern Quarry, Modum, Buskerud, Norway
Holtedahlite, etc.

Tingelstadtjern Quarry, Modum, Buskerud, Norway
Holtedahlite

Tingelstadtjern Quarry, Modum, Buskerud, Norway
Holtedahlite, etc.

Tingelstadtjern Quarry, Modum, Buskerud, Norway
Holtedahlite, etc.

Tingelstadtjern Quarry, Modum, Buskerud, Norway
Olaf Holtedahl
Formula:
Mg2(PO4)(OH)
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 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

IMA status:
Approved
First Published:
1979
Strunz 8th ed.:
7/B.04-20
Nickel-Strunz 10th (pending) ed.:
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
Dana 8th ed.:
41.6.4.2

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
6 : A2(XO4)Zq
Hey's CIM Ref.:
19.3.15

19 : Phosphates
3 : Phosphates of Be and Mg

Physical Properties of Holtedahlite

Lustre:
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

Formula:
Mg2(PO4)(OH)
IMA Formula:
Mg12(PO3OH,CO3)(PO4)5(OH,O)6
Elements listed in formula:
C, H, Mg, O, P - search for minerals with similar chemistry

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

Type Locality:
ⓘ Tingelstadtjern Quarry, Modum, Buskerud, Norway
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:
TalcSzaibélyiteSerpentine SubgroupApatiteAlthausite

Relationship of Holtedahlite to other Species

Common Associates:
Althausite
Apatite
Related Minerals - Nickel-Strunz Grouping):
8.BB.XArsenowagneriteMg2(AsO4)F
8.BB.05AmblygoniteLiAl(PO4)F
8.BB.05MontebrasiteLiAl(PO4)(OH)
8.BB.05TavoriteLiFe3+(PO4)(OH)
8.BB.10Triplite(Mn2+,Fe2+)2(PO4)(F,OH)
8.BB.10Zwieselite(Fe2+,Mn2+)2(PO4)F
8.BB.15SarkiniteMn22+(AsO4)(OH)
8.BB.15Triploidite(Mn2+,Fe2+)2(PO4)(OH)
8.BB.15Wagnerite(Mg,Fe2+)2(PO4)F
8.BB.15Wolfeite(Fe2+,Mn2+)2(PO4)(OH)
8.BB.15Stanĕkite(Mn2+,Fe2+,Mg)Fe3+(PO4)O
8.BB.15JoosteiteMn2+(Mn3+,Fe3+)(PO4)O
8.BB.15HydroxylwagneriteMg2(PO4)(OH)
8.BB.20Satterlyite(Fe2+,Mg,Fe)12(PO4)5(PO3OH)(OH,O)6
8.BB.25AlthausiteMg4(PO4)2(OH,O)(F,☐)
8.BB.30AdamiteZn2(AsO4)(OH)
8.BB.30EveiteMn22+(AsO4)(OH)
8.BB.30LibetheniteCu2(PO4)(OH)
8.BB.30OliveniteCu2(AsO4)(OH)
8.BB.30ZincolibetheniteCuZn(PO4)(OH)
8.BB.30ZincoliveniteCuZn(AsO4)(OH)
8.BB.30AuriacusiteFe3+Cu2+(AsO4)O
8.BB.35ParadamiteZn2(AsO4)(OH)
8.BB.35TarbuttiteZn2(PO4)(OH)
8.BB.40BarbosaliteFe2+Fe23+(PO4)2(OH)2
8.BB.40HentscheliteCuFe23+(PO4)2(OH)2
8.BB.40Lazulite(Mg,Fe2+)Al2(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)2(VO4)(OH)
8.BB.55Phosphoellenbergerite(Mg,◻)2Mg12(PO4,PO3OH)6(PO3OH,CO3)2(OH)6
8.BB.60UrusoviteCuAl(AsO4)O
8.BB.65TheoparacelsiteCu3(As2O7)(OH)2
8.BB.70TuraniteCu5(VO4)2(OH)4
8.BB.75StoiberiteCu5(VO4)2O2
8.BB.80FingeriteCu11(VO4)6O2
8.BB.85AverieviteCu6(VO4)2O2Cl2
8.BB.90LipscombiteFe2+Fe23+(PO4)2(OH)2
8.BB.90RichelliteCaFe23+(PO4)2(OH,F)2
8.BB.90ZinclipscombiteZnFe23+(PO4)2(OH)2
Related Minerals - Hey's Index Grouping:
19.3.1MoraesiteBe2(PO4)(OH) · 4H2O
19.3.2BerylloniteNaBePO4
19.3.3HurlbutiteCaBe2(PO4)2
19.3.4HydroxylherderiteCaBe(PO4)(OH,F)
19.3.5GlucineCaBe4(PO4)2(OH)4 · 0.5H2O
19.3.6FransoletiteCa3Be2(PO4)2(HPO4)2 · 4H2O
19.3.7UraloliteCa2Be4(PO4)3(OH)3 · 5H2O
19.3.9PahasapaiteLi8(Ca,Li,K)10.5Be24(PO4)24 · 38H2O
19.3.10TiptopiteK2(Na,Ca)2Li3Be6(PO4)6(OH)2 · H2O
19.3.11GainesiteNa(Na,K)(Be,Li)Zr2(PO4)4 · 1.5-2H2O
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(HPO4) · 3H2O
19.3.18PhosphorrössleriteMg(HPO4) · 7H2O
19.3.19BobierriteMg3(PO4)2 · 8H2O
19.3.20Barićite(Mg,Fe)3(PO4)2 · 8H2O
19.3.21Panethite(Na,Ca)2(Mg,Fe2+)2(PO4)2
19.3.22Dittmarite(NH4)Mg(PO4) · H2O
19.3.23Struvite(NH4)Mg(PO4) · 6H2O
19.3.24Hannayite(NH4)2Mg3H4(PO4)4 · 8H2O

Other Names for Holtedahlite

Synonyms:

IMA1976-054

Name in Other Languages:
Spanish:Holtedahlita

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

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https://www.mindat.org/min-1924.html
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    • 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]
    Mineral and/or Locality  
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