Juonniite Mineral Data

Juonniite Mineral Data +

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General Juonniite Information

Chemical Formula:

CaMgSc(PO4)2(OH)·4(H2O)

Composition:

Molecular Weight = 388.35 gm

Calcium 10.32 % Ca 14.44 % CaO

Magnesium 6.26 % Mg 10.38 % MgO

Scandium 11.58 % Sc 17.76 % Sc₂O₃

Phosphorus 15.95 % P 36.55 % P₂O₅

Hydrogen 2.34 % H 20.88 % H₂O

Oxygen 53.56 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaMgSc(PO₄)₂(OH)·4(H₂O)

Environment:

Metasomatically reworked calcite-phlogopite-clinohumite-magnetite ores in a calcite-dolomite carbonatitic stockwork zone. The scandium dominant analog of overite and segelerite.

IMA Status:

Approved IMA 1997 (Dana # Added)

Locality:

Kovdor ultramafic alkaline complex, Yona or Juonni River (from the Russian or Finnish), Kola Peninsula, Russia). Link to MinDat.org Location Data.

Name Origin:

The name alludes to the locality. Pronounced YO'NAITE.

Synonym:

IMA1996-060

Juonniite Image

Images:

Juonniite

Comments: Brownish grain of juonniite on matrix.
Location: Kovdor Mine, Kovdor massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Juonniite Crystallography

Axial Ratios:

a:b:c =0.7931:1:0.4005

Cell Dimensions:

a = 15.03, b = 18.95, c = 7.59, Z = 8; V = 2,161.77 Den(Calc)= 2.39

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P bca

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

By Intensity(I/I_o): 9.49(1), 2.912(0.44), 2.89(0.35),

Physical Properties of Juonniite

Cleavage:

None

Color:

Colorless, Light yellow, Yellowish brown, Gray, Bright orange.

Density:

2.43

Diaphaniety:

Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

4-4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Juonniite

Gladstone-Dale:

CI meas= -0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.032 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.242,KPDmeas= 0.238,KC= 0.2346

Optical Data:

Biaxial (-), a=1.574, b=1.579, g=1.582, bire=0.0080

Calculated Properties of Juonniite

Electron Density:

r_electron=2.45 gm/cc
note: r_Juonniite=2.43 gm/cc.

Fermion Index

Fermion Index = 0.00665
Boson Index = 0.99335

Photoelectric:

PE_Juonniite= 3.78 barns/electron
U=PE_Juonniite x r_electron= 9.28 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Juonniite is Not Radioactive

Juonniite Classification

Dana Class:

42.11.1.7 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.1)Dana Group

42.11.1.1 Overite CaMgAl(PO4)2(OH)·4(H2O) Pcca 2/m 2/m 2/m

42.11.1.2 Segelerite CaMgFe(PO4)2(OH)·4(H2O) Pcca 2/m 2/m 2/m

42.11.1.3 Manganosegelerite (Mn,Ca)(Mn,Fe,Mg)Fe(PO4)2(OH)·4(H2O) P bca 2/m 2/m 2/m

42.11.1.4 Lunokite (Mn,Ca)(Mg,Fe,Mn)Al(PO4)2(OH)·4(H2O) P bca 2/m 2/m 2/m

42.11.1.5 Wilhelmvierlingite CaMnFe(PO4)2(OH)·2(H2O) P bca 2/m 2/m 2/m

42.11.1.6 Kaluginite* (Mn,Ca)MgFe(PO4)2(OH)·4(H2O) C cca 2/m 2/m 2/m

42.11.1.7 Juonniite ! CaMgSc(PO4)2(OH)·4(H2O) P bca 2/m 2/m 2/m

Strunz Class:

VII/D.28-25 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.28 - Overite- Segelerite group

VII/D.28-10 Overite CaMgAl(PO4)2(OH)·4(H2O) Pcca 2/m 2/m 2/m

VII/D.28-20 Segelerite CaMgFe(PO4)2(OH)·4(H2O) Pcca 2/m 2/m 2/m

VII/D.28-25 Juonniite CaMgSc(PO4)2(OH)·4(H2O) P bca 2/m 2/m 2/m

VII/D.28-30 Wilhelmvierlingite CaMnFe(PO4)2(OH)·2(H2O) P bca 2/m 2/m 2/m

VII/D.28-40 Lunokite (Mn,Ca)(Mg,Fe,Mn)Al(PO4)2(OH)·4(H2O) P bca 2/m 2/m 2/m

VII/D.28-50 Manganosegelerite (Mn,Ca)(Mn,Fe,Mg)Fe(PO4)2(OH)·4(H2O) P bca 2/m 2/m 2/m

Other Juonniite Information

References:

NAME( AmMin) PHYS. PROP.(Min.Mag.,Vol.61,p736,1997) OPTIC PROP.(AmMin)

See Also:

Links to other databases for Juonniite :
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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Juonniite

CaMgSc(PO4)2(OH)·4(H2O)
Dana No: 42.11.1.7 Strunz No: VII/D.28-25
Locality:

Notes: