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Raadeite

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Gunnar Raade
Formula:
Mg7(PO4)2(OH)8
Colour:
Colourless
Lustre:
Pearly
Specific Gravity:
2.806 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
For Dr. Gunnar Raade (1944-), Senior Curator of Minerals Emeritus, Natural History Museum, Oslo, Norway, in recognition of his contribution to the mineralogy of magnesium phosphates.
Isostructural with the Mn-arsenate allactite and the Mn-vanadate argandite.


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Classification of RaadeiteHide

Approved
Approval Year:
1996
First Published:
2001
8.BE.30

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
E : With only medium-sized cations, (OH, etc.):RO4 > 2:1

Physical Properties of RaadeiteHide

Pearly
Colour:
Colourless
Streak:
White
Density:
2.806 g/cm3 (Calculated)

Optical Data of RaadeiteHide

Type:
Biaxial (-)
RI values:
nα = 1.595 nβ = 1.607 nγ = 1.609
2V:
Measured: 45° , Calculated: 42°
Max Birefringence:
δ = 0.014
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v strong

Chemical Properties of RaadeiteHide

Formula:
Mg7(PO4)2(OH)8

Crystallography of RaadeiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 5.259 Å, b = 11.647 Å, c = 9.655 Å
β = 95.94°
Ratio:
a:b:c = 0.452 : 1 : 0.829
Unit Cell V:
587.2 ų
Z:
2
Comment:
Spacegroup P2 1 /n

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.436(75)
3.521(80)
3.145(70)
3.087(70)
2.905(100)
2.794(75)
2.199(80)

Type Occurrence of RaadeiteHide

General Appearance of Type Material:
Veinlets of a few tens of μm wide; as fibrous coronae with apatite, altausite, magnesite replacing cm-size heneuite; as rare, up to 150µm large anhedral inclusions in holtedahlite
Place of Conservation of Type Material:
In the Musée de Minéralogie, École des Mines, Paris, France
Geological Setting of Type Material:
In nodules of apatite and magnesium phopspates in a serpentinite body
Associated Minerals at Type Locality:

Synonyms of RaadeiteHide

Other Language Names for RaadeiteHide

German:Raadeit
Spanish:Raadeita

Relationship of Raadeite to other SpeciesHide

Member of:
Other Members of this group:
AllactiteMn2+7(AsO4)2(OH)8Mon. 2/m : P21/b
ArganditeMn7(VO4)2(OH)8Mon. 2/m : P21/m

Common AssociatesHide

Associated Minerals Based on Photo Data:
Heneuite1 photo of Raadeite associated with Heneuite on mindat.org.
Althausite1 photo of Raadeite associated with Althausite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.BE.05AugeliteAl2(PO4)(OH)3Mon. 2/m : B2/m
8.BE.10GrattarolaiteFe3+3(PO4)O3Trig. 3m : R3m
8.BE.15CornetiteCu3(PO4)(OH)3Orth. mmm (2/m 2/m 2/m) : Pbca
8.BE.20ClinoclaseCu3(AsO4)(OH)3Mon. 2/m : P21/b
8.BE.25ArhbariteCu2Mg(AsO4)(OH)3Tric. 1 : P1
8.BE.25GilmariteCu3(AsO4)(OH)3Tric.
8.BE.30AllactiteMn2+7(AsO4)2(OH)8Mon. 2/m : P21/b
8.BE.30FlinkiteMn2+2Mn3+(AsO4)(OH)4Orth.
8.BE.30ArganditeMn7(VO4)2(OH)8Mon. 2/m : P21/m
8.BE.35Chlorophoenicite(Mn,Mg)3Zn2(AsO4)(OH,O)6Mon. 2/m : B2/m
8.BE.35Magnesiochlorophoenicite(Mg,Mn)3Zn2(AsO4)(OH,O)6Mon. 2/m : B2/m
8.BE.40Gerdtremmelite(Zn,Fe)(Al,Fe)2(AsO4)(OH)5Tric.
8.BE.45DixeniteCuMn2+14Fe2+(SiO4)2(As5+O4)(As3+O3)5(OH)6Trig.
8.BE.45Hematolite(Mn,Mg,Al,Fe3+)15(As5+O4)2(As3+O3)(OH)23Trig. 3 : R3
8.BE.45KraissliteZn3(Mn,Mg)25(Fe3+,Al)(As3+O3)2[(Si,As5+)O4]10(OH)16Orth. 2 2 2 : C2 2 21
8.BE.45McgoverniteMn19Zn3(AsO4)3(AsO3)(SiO4)3(OH)21Trig. 3m (3 2/m)
8.BE.45Arakiite(Zn,Mn2+)(Mn2+,Mg)12(Fe3+,Al)2(As5+O4)2(As3+O3)(OH)23Mon.
8.BE.45Turtmannite(Mn,Mg)22.5Mg3-3x((V5+,As5+)O4)3(As3+O3)x(SiO4)3O5-5x(OH)20+xTrig.
8.BE.45CarlfrancisiteMn2+3(Mn2+,Mg,Fe3+,Al)42[As3+O3]2(As5+O4)4[(Si,As5+)O4]6[(As5+,Si)O4]2(OH)42 Trig. 3m (3 2/m) : R3c
8.BE.50SynadelphiteMn2+9(As5+O4)2(As3+O3)(OH)9 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.BE.55Holdenite(Mn2+,Mg)6Zn3(AsO4)2(SiO4)(OH)8Orth. mmm (2/m 2/m 2/m) : Ccca
8.BE.60KoliciteMn2+7Zn4(AsO4)2(SiO4)2(OH)8Orth. mmm (2/m 2/m 2/m) : Cmca
8.BE.65Sabelliite(Cu,Zn)2Zn(AsO4,SbO4)(OH)3Trig. 3 : P3
8.BE.70JarosewichiteMn2+3Mn3+(AsO4)(OH)6Orth. 2 2 2
8.BE.75TheisiteCu5Zn5(AsO4,SbO4)2(OH)14Orth.
8.BE.80CoparsiteCu4(AsO4,VO4)O2ClOrth.
8.BE.85WaterhouseiteMn2+7(PO4)2(OH)8Mon. 2/m : P21/b

Other InformationHide

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 RaadeiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Chopin, C., Ferraris,G..Prencipe, M., Brunet, F. and Medenbach, O. (2001): Raadeite, Mg7(PO4)2(OH)8: a new dense-packed phospate from Modum (Norway). European Journal of Mineralogy. 13: 319-327.

Internet Links for RaadeiteHide

Localities for RaadeiteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Norway (TL)
 
  • Buskerud
    • Modum
Chopin, C., Ferraris,G..Prencipe, M., Brunet, F. and Medenbach, O. (2001): Raadeite, Mg7(PO4)2(OH)8: a new dense-packed phospate from Modum (Norway). European Journal of Mineralogy. 13: 319-327.
Mineral and/or Locality  
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