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Raadeite

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

Classification of Raadeite

Approved
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
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First Recorded Occurrence of Raadeite

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

Physical Properties of Raadeite

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

Crystallography of Raadeite

Crystal System:
Monoclinic
Cell Parameters:
a = 5.259Å, b = 11.647Å, c = 9.655Å
β = 95.94°
Ratio:
a:b:c = 0.452 : 1 : 0.829
Unit Cell Volume:
V 587.2 ų
Z:
2
X-Ray 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)

Optical Data of Raadeite

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 Raadeite

Formula:
Mg7(PO4)2(OH)8
Essential elements:
All elements listed in formula:

Relationship of Raadeite to other Species

Member of:
Other Members of Group:
AllactiteMn72+(AsO4)2(OH)8
ArganditeMn7(VO4)2(OH)8
8.BE.05AugeliteAl2(PO4)(OH)3
8.BE.10GrattarolaiteFe33+(PO4)O3
8.BE.15CornetiteCu3(PO4)(OH)3
8.BE.20ClinoclaseCu3(AsO4)(OH)3
8.BE.25ArhbariteCu2Mg(AsO4)(OH)3
8.BE.25GilmariteCu3(AsO4)(OH)3
8.BE.30AllactiteMn72+(AsO4)2(OH)8
8.BE.30FlinkiteMn22+Mn3+(AsO4)(OH)4
8.BE.30ArganditeMn7(VO4)2(OH)8
8.BE.35Chlorophoenicite(Mn,Mg)3Zn2(AsO4)(OH,O)6
8.BE.35Magnesiochlorophoenicite(Mg,Mn)3Zn2(AsO4)(OH,O)6
8.BE.40Gerdtremmelite(Zn,Fe)(Al,Fe)2(AsO4)(OH)5
8.BE.45DixeniteCuMn142+Fe2+(SiO4)2(As5+O4)(As3+O3)5(OH)6
8.BE.45Hematolite(Mn,Mg,Al,Fe3+)15(As5+O4)2(As3+O3)(OH)23
8.BE.45KraissliteZn3(Mn,Mg)25(Fe3+,Al)(As3+O3)2[(Si,As5+)O4]10(OH)16
8.BE.45McgoverniteMn19Zn3(AsO4)3(AsO3)(SiO4)3(OH)21
8.BE.45Arakiite(Zn,Mn2+)(Mn2+,Mg)12(Fe3+,Al)2(As5+O4)2(As3+O3)(OH)23
8.BE.45Turtmannite(Mn,Mg)22.5Mg3-3x((V5+,As5+)O4)3(As3+O3)x(SiO4)3O5-5x(OH)20+x
8.BE.45CarlfrancisiteMn32+(Mn2+,Mg,Fe3+,Al)42[As3+O3]2(As5+O4)4[(Si,As5+)O4]6[(As5+,Si)O4]2(OH)42
8.BE.50SynadelphiteMn92+(As5+O4)2(As3+O3)(OH)9 · 2H2O
8.BE.55Holdenite(Mn2+,Mg)6Zn3(AsO4)2(SiO4)(OH)8
8.BE.60KoliciteMn72+Zn4(AsO4)2(SiO4)2(OH)8
8.BE.65Sabelliite(Cu,Zn)2Zn(AsO4,SbO4)(OH)3
8.BE.70JarosewichiteMn32+Mn3+(AsO4)(OH)6
8.BE.75TheisiteCu5Zn5(AsO4,SbO4)2(OH)14
8.BE.80CoparsiteCu4(AsO4,VO4)O2Cl
8.BE.85WaterhouseiteMn72+(PO4)2(OH)8

Other Names for Raadeite

Name in Other Languages:
German:Raadeit
Spanish:Raadeita

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 Raadeite

Reference List:
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 Raadeite

Localities for Raadeite

(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
 
  • 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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