Mineral Information and Data:

Almarudite
KNaMn2+2(Be3Si12)O30 [CNMNC approved formula]

Named for the University of Vienna, Austria (in latin: ALma MAter RUDolphina).

IMA status : Approved Species 2004 (IMA2002-048)
CLASSIFICATION 
Dana
(8th edition) :
63.02.01a.1  (This Dana# Added)
  (63) Cyclosilicate Condensed Rings
  (63.02) 6-membered rings
  (63.02.01a) Milarite - Osumilite group (Milarite - Osumilite subgroup)
  
Nickel-Strunz
(10th edition) :
09.CM.05
  (09) Silicates
  (09.C) Cyclosilicates
  (09.CM) [Si6O18]12- 6-membered double rings (sechser-Doppelringe)
  
Crystal system: Hexagonal System
Point group (H-M): 6/mmm (or 6/m 2/m 2/m) — dihexagonal-dipyramidal
Unit cell: a = 9.997 Å, c = 14.09 Å
Crystal Habit: Crystals euhedral; tabular crystals to 1.5 mm across
  
Color: Yellow, Orange
Diaphaneity: Transparent, Translucent
Luster: Vitreous
Hardness (Mohs): 6
Measured Density: 2.71 g/cm3
Tenacity: Brittle
Fracture: Irregular/Uneven
Streak: Pale orange
  
Geologic Setting: In vugs of siliceous xenolites in leucite-rich lava slags
  

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