General Information
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| Chemical Formula: |
CaMgSc(PO4)2(OH)·4(H2O) |
| Composition: |
Molecular Weight = 388.35 gm) |
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| 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 |
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Classification
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| 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 |
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Crystallography
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| 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) |
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Physical Properties
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| 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 |
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Optical Properties
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| Optical Data: |
Biaxial (-), a=1.574, b=1.579, g=1.582, bire=0.0080 |
| Pleochroism (x): |
none. |
| Pleochroism (y): |
none. |
| Pleochroism (z): |
none. |
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Other Information
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| References: |
NAME( AmMin) PHYS. PROP.(Min.Mag.,Vol.61,p736,1997) OPTIC PROP.(AmMin) |
| See Also: |
 Frederic Biret |
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Google |
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MinMax |
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