Mineral Information and Data:

Alloriite
(Na,K,Ca)29(Si,Al)48O96(SO4,Cl)5.6 • n(CO3,H2O) [CNMNC approved formula]

Named for Roberto Allori (1933*), Italian amateur mineralogist and collector, who found the mineral.

IMA status : Approved Species 2006 (IMA2006-020)
CLASSIFICATION 
Dana
(8th edition) :
76.02.05.19  (This Dana# Added)
  (76) Tectosilicate Al-Si Framework
  (76.02) Feldspathoids and related species
  (76.02.05) Cancrinite group
  
Nickel-Strunz
(10th edition) :
09.FB.05
  (09) Silicates
  (09.F) Tektosilicates without Zeolitic H2O
  (09.FB) Tektosilicates with additional anions
  
Crystal system: Trigonal System
Point group (H-M): 3m — ditrigonal-pyramidal
Unit cell: a = 12.892 Å, c = 21.34 Å
Crystal Habit: Prismatic; tabular crystals
  
Color: Colorless
Diaphaneity: Transparent
Luster: Vitreous
Hardness (Mohs): 5
Measured Density: 2.35 g/cm3
Cleavage: {100} Imperfect
Tenacity: Brittle
Streak: White
  
Geologic Setting: Sabatino volcanic complex. Afghanite structure type.
  
Synonyms/varieties: IMA2006-020

 

Alloriite
Colorless alloriite prisms in vug.
Mineral has been confirmed by single-crystal X-ray diffraction.
Origin: Monte Cavalluccio, near Campagnano di Roma, Rome, Latium, Italy.
Photo: © Rruff Database

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