Raadeite Mineral Data

Raadeite Mineral Data

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General Raadeite Information

Chemical Formula:

Mg7(PO4)2(OH)8

Composition:

Molecular Weight = 493.69 gm

Magnesium 33.38 % Mg 55.35 % MgO

Manganese 0.22 % Mn 0.29 % MnO

Iron 0.23 % Fe 0.29 % FeO

Arsenic 0.30 % As 0.47 % As₂O₅

Phosphorus 12.30 % P 28.18 % P₂O₅

Hydrogen 1.72 % H 15.36 % H₂O

Oxygen 51.85 % O

______ ______

100.00 % 99.94 % = TOTAL OXIDE

Empirical Formula:

Mg_6.78Fe²⁺_0.02Mn²⁺_0.02P_1.96As_0.02H_8.42O₁₆

Environment:

Low pressure and temperature metamorphic mineral in apatite-rich nodules in sepentine. The magnesium and phosphate dominant analog of allactite.

IMA Status:

Approved IMA 2001 (Dana # Added)

Locality:

Serpentinite body near Tingelstadtjern in the Modum district of southern Norway. Link to MinDat.org Location Data.

Name Origin:

Named for Gunnar Raade (1944-), minerals curator at the Natural History Museum, Oslo, Norway.

Synonym:

IMA1996-034

Raadeite Image

Images:

Raadeite Heneuite

Comments: Translucent aqua colored greasy heneuite grain, surrounded by beige rim of raadeite, with dark blue phosphoellenbergerite inclusion (near top of heneuite), in quartz apatite rock.
Location: Tingelstadt Iron Mine, Modum, Buskerud, Norway. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Raadeite

Comments: Black and white image of a petrographic thin section showing two crystals of raadeite (arrows) included in holtedahlite. (Eur. J. Mineral, 13:320).
Location: Nodules of apatite + Mg-phosphates within the Tingelstadtjern serpentinite body, Modum district, Norway. Scale: See Image.
© Eur. J. Mineral

Raadeite Crystallography

Axial Ratios:

a:b:c =0.4507:1:0.8289

Cell Dimensions:

a = 5.25, b = 11.647, c = 9.655, Z = 2; beta = 95.94° V = 587.20 Den(Calc)= 2.79

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.905(1)(131), 3.521(0.8)(122,121), 2.199(0.8)(142,202),2.794(0.75)(023,041), 4.436(0.75)(111), 3.087(0.7)(013), 3.145(0.7)(122),

Crystal Structure:

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Chopin C , Ferraris G , Prencipe M , Brunet F , Medenbach O , European Journal of Mineralogy , 13 (2001) p.319-327, Raadeite, Mg7(PO4)2(OH)8: a new dense-packed phosphate, from Modum (Norway), Locality: Modum, Norway

Physical Properties of Raadeite

Cleavage:

None

Color:

Colorless.

Diaphaniety:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Inclusions - Generally found as inclusions in other minerals.

Habit:

Selvage - As a reaction rim, surrounding the host mineral.

Luster:

Pearly

Streak:

white

Optical Properties of Raadeite

Gladstone-Dale:

CI calc= 0 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2163,KC= 0.2164

Optical Data:

Biaxial (-), a=1.5945, b=1.6069, g=1.6088, bire=0.0143, 2V(Calc)=42, 2V(Meas)=45.6. Dispersion r > v strong.

Calculated Properties of Raadeite

Electron Density:

r_electron=2.81 gm/cc
note: r_Raadeite=2.79 gm/cc.

Fermion Index

Fermion Index = 0.03367
Boson Index = 0.96633

Photoelectric:

PE_Raadeite= 1.68 barns/electron
U=PE_Raadeite x r_electron= 4.71 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Raadeite is Not Radioactive

Raadeite Classification

Dana Class:

41.2.1.2 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.2)where (A B)7 (XO4)2 Zq

(41.2.1)Dana Group

41.2.1.1 Allactite Mn7(AsO4)2(OH)8 P 2₁/a 2/m

41.2.1.2 Raadeite ! Mg7(PO4)2(OH)8 P 2₁/n 2/m

41.2.1.3 IMA2004-035! Mn7(PO4)2(OH)8 P 2₁/c 2/m

Strunz Class:

VII/B.15-45 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds

VII/B.15 - Pseudomalachite group, Flinkite - Allactite series

VII/B.15-10 Flinkite Mn2Mn(AsO4)(OH)4 P nma 2/m 2/m 2/m

VII/B.15-20 Retzian-(La) (Mn,Mg)2(La,Ce,Nd)(AsO4)(OH)4 Pban 2/m 2/m 2/m

VII/B.15-30 Retzian-(Ce) Mn2Ce(AsO4)(OH)4 Pban 2/m 2/m 2/m

VII/B.15-40 Retzian-(Nd) Mn2(Nd,Ce,La)(AsO4)(OH)4 Pban 2/m 2/m 2/m

VII/B.15-45 Raadeite Mg7(PO4)2(OH)8 P 2₁/n 2/m

VII/B.15-50 Allactite Mn7(AsO4)2(OH)8 P 2₁/a 2/m

Other Raadeite Information

References:

NAME( AmMin, 86:1536) PHYS. PROP.(AmMin, 86:1536) OPTIC PROP.(AmMin, 86:1536)

See Also:

Links to other databases for Raadeite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Raadeite

Mg7(PO4)2(OH)8
Dana No: 41.2.1.2 Strunz No: VII/B.15-45
Locality:

Notes: