Juonniite Mineral Data

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/I_o): 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
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	MinMax

Juonniite Mineral Data

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