Mineral Information and Data:

Alumoakermanite
(Ca,Na)2(Al,Mg,Fe2+)(Si2O7) [CNMNC approved formula]

Named as the Al analog of akermanite.

IMA status : Approved Species 2008 (IMA2008-049)
CLASSIFICATION 
Dana
(8th edition) :
55.04.01.05  (This Dana# Added)
  (55) Sorosilicate Si2O7 Groups, Generally with No Additional Anions
  (55.04) with cations in [8] and lower coordination
  (55.04.01) Melilite group
  
Nickel-Strunz
(10th edition) :
08.DE.35
  (08) Phosphates, Arsenates, Vanadates
  (08.D) Phosphates, etc
  (08.DE) With only medium-sized cations, (OH, etc.):RO4 = 3:1
  
Crystal system: Tetragonal System
Point group (H-M): 42m (or 4 2m) — scalenohedral
Unit cell: a = 7.766(4) Å, c = 5.0297(4) Å
Crystal Habit: Crystals tabular
  
Hardness (Mohs): 4 - 5
  
Geologic Setting: Found in evolved olivine free melilite-nephelinitic ashes and lapilli-tuffs as a silicate phase in non-carbonatite lavas.
  

 

Alumoakermanite
Fragment of large monograin of Alumoåkermanite (IMA2008-049) from pegmatite or metasomatic rock. Associating minerals are Сebollite and Juanite forming whitish cm-thick veinlet in upper part of the specimen. Mineral composition confirmed by EDS spectrum.
Origin: Odikhincha massif, Maimecha and Kotui Rivers Basin, Krasnoyarsk Territory (Krasnoyarsk Kray; Krasnoyarskii Krai), Eastern-Siberian Region, Russia
Sample size: 8x6.5x2 cm
Photo Copyright © Pavel M. Kartashov

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