Mineral Information and Data:

Ardennite-(V)
Mn2+4(AlMg)Al4(Si5V)O22(OH)6 [CNMNC approved formula]

Named as the vanadium analogue of ardennite-(As).

IMA status : Approved Species 2005 (IMA2005-037)
CLASSIFICATION 
Dana
(8th edition) :
58.03.01.03  (This Dana# Added)
  (58) Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups
  (58.03) with insular single and triple groups (n=1,3)
  (58.03.01) Ardennite group
  
Nickel-Strunz
(10th edition) :
09.BJ.40
  (09) Silicates
  (09.B) Sorosilicates (dimer) structures
  (09.BJ) Sorosilicates with Si3O10, Si4O11, etc. anions; cations in octahedral [6] and greater coordination
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
Unit cell: a = 8.76Å, b = 5.838Å, c = 18.56Å
Crystal Habit: accicular; tabular
  
Color: Yellow
Diaphaneity: Transparent
Luster: Vitreous
Hardness (Mohs): 6 - 7
Measured Density: 3.55 g/cm3
Tenacity: Brittle
Fracture: Subconchoidal to uneven
Streak: White
  
Geologic Setting: Found in a specimen of piemontite-bearing mica schist.
  

 

Ardennite-(V)
Ardennite-(V) crystals (yellow) with piemontite.
Origin: Feilongo, Sparone, Orco Valley, Torino Province, Piedmont, Italy.
Image size: 5mm
Photo and owner: © Giovanni Fraccaro

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