Mineral Information and Data:

Levyne-Ca
Ca3(Si12Al6)O36 • 18H2O [CNMNC approved formula]

Named as the calcium-dominant member of levyne serires. Species named for Armand Lévy (1794-1841), French mineralogist and crystallographer, Paris University, France. First published in 1825 as leveyne. Name changed from levyne (now a series name) per nomenclature for zeolite minerals (IMA, 1997).

IMA status : Renamed IMA Approved; 1997 ()
CLASSIFICATION 
Dana
(8th edition) :
77.01.02.08  
  (77) Tectosilicate Zeolite group
  (77.01) true zeolites
  (77.01.02) Chabazite and related species
  
Nickel-Strunz
(10th edition) :
09.GD.15
  (09) Silicates
  (09.G) Tektosilicates with Zeolitic H2O
  (09.GD) Chains of 6-membered rings - tabular zeolites
  
Crystal system: Trigonal System
Point group (H-M): 3m (or 3 2/m) — hexagonal-scalenohedral
Space group: R3m
Unit cell: a = 13.338(4)Å, c = 23.014(9)Å, V=3
Crystal Habit: Crystals are thin tabular ⊥ {0001}, with faces typically striated and {0001} rounded, to 3 cm; in sheaf-like or confused aggregates.
Twinning: Penetration twins on {0001} ubiquitous
  
Color: Colorless, white; stained grayish, greenish, reddish, yellowish by impurities; colorless in thin section
Diaphaneity: Transparent to translucent
Luster: Vitreous
Hardness (Mohs): 4 - 4.5
Measured Density: 2.09 - 2.16 g/cm3
Cleavage: {1011}, indistinct
Tenacity: Brittle
Fracture: Subconchoidal to uneven
  
Geologic Setting: Typically as a crystalline lining in cavities in basalts.
Mineral Association: Zeolites, especially offretite and erionite
  

 

Levyne-Ca
White bladed levyne-Ca crystals in cavities in matrix
Origin: Beech Creek Quarry, Mt. Vernon, Grant Co., Oregon, U.S.A.
Sample size: 4 x 4 cm
Photo: Diederik Visser

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