Mineral Information and Data:

Altisite
Na3K6Ti2Al2Si8O26Cl3 [CNMNC approved formula]

Named for the elements Al, Ti, and Si in the composition.

IMA status : Approved Species 1994 (IMA1993-055)
CLASSIFICATION 
Dana
(8th edition) :
74.03.03.01  
  (74) Phyllosilicate Modulated Layers
  (74.03) with joined strips
  (74.03.03) Altisite/lemoynite
  
Nickel-Strunz
(10th edition) :
09.DP.40
  (09) Silicates
  (09.D) Inosilicates* Structural terminology per Liebau (1985)
  (09.DP) Transitional ino-phyllosilicate structures
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 10.37 Å, b = 16.32 Å, c = 9.16 Å, b = 105.6°
Crystal Habit: Anhedral Grains, granular without the expression of crystal shapes
  
Color: Colorless to white
Diaphaneity: Transparent
Luster: Vitreous
Hardness (Mohs): 6
Measured Density: 2.64 g/cm3
Tenacity: Brittle
Streak: White
  
Geologic Setting: In the interstices of pectolite crystals in a hyperagpaitic pegmatite.
  

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