Scandium

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Juonniite Mineral Data

juonniite-mineral
General Information
Chemical Formula:CaMgSc(PO4)2(OH)·4(H2O)
Composition:Molecular Weight = 388.35 gm)
  Oxygen53.56 % O
  Hydrogen2.34 % H
  Phosphorus15.95 % P
  Scandium11.58 % Sc
  Magnesium6.26 % Mg
  Calcium10.32 % Ca
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 (Dana # Added)
Locality:Kovdor ultramafic alkaline complex, Yona or Juonni River (from the Russian or Finnish), Kola Peninsula, Russia).
Name Origin:The name alludes to the locality. Pronounced YO’NAITE.
Synonym:IMA96.060
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
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 – Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbca
X Ray Diffraction:By Intensity(I/Io): 9.49(1) 2.912(0.44) 2.89(0.35)
Physical Properties
Cleavage:None
Color:colorless, light yellow, yellowish brown, gray, or bright orange.
Density:2.43
Diaphaniety:Translucent
Habits:Spherical – Spherical, rounded aggregates., Platy – Sheet forms (e.g. micas).,
Hardness:4-4.5 – Between Fluorite and Apatite
Luminescence:Non-fluorescent.
Luster:Vitreous (Glassy)
Streak:white
Optical Properties
Optical Data:Biaxial (-), a=1.574, b=1.579, g=1.582, bire=0.0080
Pleochroism (x):none.
Pleochroism (y):none.
Pleochroism (z):none.
Other Information
References:NAME( AmMin) PHYS. PROP.(Min.Mag.,Vol.61,p736,1997) OPTIC PROP.(AmMin)
See Also: Frederic Biret
 Google
 MinMax

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