Mineral Information and Data:

Kanonaite
Mn3+AlOSiO4 [CNMNC approved formula]

Named for the locality: 13 km north of Kanona, Serenje, Zambia.

IMA status : Approved Species 1978 (IMA1976-047)
CLASSIFICATION 
Dana
(8th edition) :
52.02.02b.02  
  (52) Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.02) with cations in [4] and >[4] coordination
  (52.02.02b) AL2SIO5 (Andalusite subgroup)
  
Nickel-Strunz
(10th edition) :
09.AF.10
  (09) Silicates
  (09.A) Nesosilicates (Isolated tetrahedron) structures
  (09.AF) Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
Space group: Pnnm
Unit cell: a = 7.959(2) Å, b = 8.047(2) Å, c = 5.616(1) Å, Z=4
Crystal Habit: As anhedral nodular porphyroblasts, to 1.2 cm.
  
Color: Greenish black
Diaphaneity: Transparent to translucent
Luster: Vitreous
Hardness (Mohs): 6.5
Measured Density: 3.395 (calculated) g/cm3
Cleavage: Poor on {110}
Streak: Gray-green
  
Polymorphism and Series: Forms a series with andalusite.
Geologic Setting: Formed under low-grade metamorphic conditions, in a gahnite schist (Kanona, Zambia); in a schist (Salmch^ateau, Belgium).
Mineral Association: Gahnite, magnesian chlorite, coronadite, braunite (Kanona, Zambia); quartz, muscovite, paragonite, chlorite, hematite, braunite, rutile, apatite (Salmchateau, Belgium).
  

 

Kanonaite
Dark green kanonaite crystals to 2 mm in matrix.
Origin: Le Coreux, Salm-Château, Vielsalm, Stavelot Massif, Luxembourg Province, Belgium (type locality).
Photo and collection: © Knut Eldjarn

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