Mineral Information and Data:

Abenakiite-(Ce)
Na26Ce6(SiO3)6(PO4)6(CO3)6(SO2)O [CNMNC approved formula]

Named for the Abenaki Indian tribe, which inhabited the area around Mont Saint-Hilaire.

IMA status : Approved Species 1991 (IMA1991-054)
CLASSIFICATION 
Dana
(8th edition) :
61.04.01.01  
  (61) Cyclosilicate Six-Membered Rings
  (61.04) with other anions
  (61.04.01)
  
Nickel-Strunz
(10th edition) :
09.CK.10
  (09) Silicates
  (09.C) Cyclosilicates
  (09.CK) [Si6O18]12- branched 6-membered single rings, with insular complex anions
  
Crystal system: Trigonal System
Point group (H-M): 3m (or 3 2/m) — hexagonal-scalenohedral
Unit cell: a = 16.018 Å, c = 19.761 Å
Crystal Habit: An ellipsoidal grain 1 x 2 mm
  
Color: Pale brown
Diaphaneity: Transparent
Luster: Vitreous
Hardness (Mohs): 4
Measured Density: 3.21 g/cm3
Cleavage: {0001} Poor
Tenacity: Brittle
Fracture: Conchoidal
Streak: White
  
Geologic Setting: Found as a single crystal embedded in sodalite in a xenolith of sodalite syenite.
  

 

Abenakiite-(Ce)
Pale brown abenakiite-(Ce) in ussingite
Origin: Sirenevaya Vein, Lovozero, Kola, Russia
Sample size: micromount
Photo: Diederik Visser

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