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Raadeite

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Formula:
Mg
 
7
(PO
 
4
)
 
2
(OH)
 
8
System:MonoclinicColour:Colourless
Lustre:Pearly
Member of:Allactite Group
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

IMA status:Approved
Nickel-Strunz 10th (pending) edition ID: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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Type Occurrence of Raadeite

Type Locality:Tingelstadtjern Quarry, Modum, Buskerud, Norway
General Appearance of Type Material:Veinlets of a few tens of μm wide; as fibrous coronae with apatite, altausite, magnesite replacing cm-size heneuite
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:
MagnesiteHoltedahliteHeneuiteApatiteApatite

Physical Properties of Raadeite

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

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:
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°
Maximum Birefringence:δ = 0.014

Chart 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:
Mg
 
7
(PO
 
4
)
 
2
(OH)
 
8
Simplified for copy/paste:Mg7(PO4)2(OH)8
Essential elements:H, Mg, O, P
All elements listed in formula:H, Mg, O, P

Relationship of Raadeite to other Species

Member of:Allactite Group
Other Members of Group:

- +
Allactite
Mn
2+
7
(AsO
 
4
)
 
2
(OH)
 
8
Argandite
Mn
 
7
(VO
 
4
)
 
2
(OH)
 
8
Related Minerals - Nickel-Strunz Grouping):

- +
8.BE.05Augelite
Al
 
2
(PO
 
4
)(OH)
 
3
8.BE.10Grattarolaite
Fe
3+
3
(PO
 
4
)O
 
3
8.BE.15Cornetite
Cu
 
3
(PO
 
4
)(OH)
 
3
8.BE.20Clinoclase
Cu
 
3
(AsO
 
4
)(OH)
 
3
8.BE.25Arhbarite
Cu
 
2
Mg(AsO
 
4
)(OH)
 
3
8.BE.25Gilmarite
Cu
 
3
(AsO
 
4
)(OH)
 
3
8.BE.30Allactite
Mn
2+
7
(AsO
 
4
)
 
2
(OH)
 
8
8.BE.30Flinkite
Mn
2+
2
Mn
3+
 
(AsO
 
4
)(OH)
 
4
8.BE.30Argandite
Mn
 
7
(VO
 
4
)
 
2
(OH)
 
8
8.BE.35Chlorophoenicite
(Mn,Mg)
 
3
Zn
 
2
(AsO
 
4
)(OH,O)
 
6
8.BE.35Magnesiochlorophoenicite
(Mg,Mn)
 
3
Zn
 
2
(AsO
 
4
)(OH,O)
 
6
8.BE.40Gerdtremmelite
(Zn,Fe)(Al,Fe)
 
2
(AsO
 
4
)(OH)
 
5
8.BE.45Dixenite
CuMn
2+
14
Fe
2+
 
(SiO
 
4
)
 
2
(As
5+
 
O
 
4
)(As
3+
 
O
 
3
)
 
5
(OH)
 
6
8.BE.45Hematolite
(Mn,Mg,Al)
 
15
(As
5+
 
O
 
4
)
 
2
(As
3+
 
O
 
3
)(OH)
 
23
8.BE.45Kraisslite
Zn
 
3
(Mn,Mg)
 
25
(Fe
3+
 
,Al)(As
3+
 
O
 
3
)
 
2
[(Si,As
5+
 
)O
 
4
]
 
10
(OH)
 
16
8.BE.45Mcgovernite
Mn
 
19
Zn
 
3
(AsO
 
4
)
 
3
(AsO
 
3
)(SiO
 
4
)
 
3
(OH)
 
21
8.BE.45Arakiite
(Zn,Mn
2+
 
)(Mn
2+
 
,Mg)
 
12
(Fe
3+
 
,Al)
 
2
(As
5+
 
O
 
4
)
 
2
(As
3+
 
O
 
3
)(OH)
 
23
8.BE.45Turtmannite
(Mn,Mg)
 
22.5
Mg
 
3-3x
((V
5+
 
,As
5+
 
)O
 
4
)
 
3
(As
3+
 
O
 
3
)
 
x
(SiO
 
4
)
 
3
O
 
5-5x
(OH)
 
20+x
8.BE.45Carlfrancisite
Mn
2+
3
(Mn
2+
 
,Mg,Fe
3+
 
,Al)
 
42
[As
3+
 
O
 
3
]
 
2
(As
5+
 
O
 
4
)
 
4
[(Si,As
5+
 
)O
 
4
]
 
6
[(As
5+
 
,Si)O
 
4
]
 
2
(OH)
 
42
8.BE.50Synadelphite
Mn
2+
9
(As
5+
 
O
 
4
)
 
2
(As
3+
 
O
 
3
)(OH)
 
9
· 2H
 
2
O
8.BE.55Holdenite
(Mn
2+
 
,Mg)
 
6
Zn
 
3
(AsO
 
4
)
 
2
(SiO
 
4
)(OH)
 
8
8.BE.60Kolicite
Mn
2+
7
Zn
 
4
(AsO
 
4
)
 
2
(SiO
 
4
)
 
2
(OH)
 
8
8.BE.65Sabelliite
(Cu,Zn)
 
2
Zn(AsO
 
4
,SbO
 
4
)(OH)
 
3
8.BE.70Jarosewichite
Mn
2+
3
Mn
3+
 
(AsO
 
4
)(OH)
 
6
8.BE.75Theisite
Cu
 
5
Zn
 
5
(AsO
 
4
,SbO
 
4
)
 
2
(OH)
 
14
8.BE.80Coparsite
Cu
 
4
(AsO
 
4
,VO
 
4
)O
 
2
Cl
8.BE.85Waterhouseite
Mn
2+
7
(PO
 
4
)
 
2
(OH)
 
8

Other Names for Raadeite

Synonyms:
IMA1996-034
Other Languages:
German:Raadeit
Russian:Раадеит
Spanish:Raadeita

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 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.

Mindat.org articles about Raadeite

Article entries:
A tribute to Gunnar Raade on his 70th birthday Knut Edvard Larsen

Internet Links for Raadeite

Search Engines:
  • Look for Raadeite on Google
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  • External Links:
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  • Look for Raadeite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Raadeite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Localities for Raadeite

    (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.
    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.
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