Mineral Information and Data:

Marialite
(Na,Ca)4(Si,Al)12O24(Cl,CO3,SO4) [CNMNC approved formula]

Named for Maria Rosa vom Rath, wife of Gerhard vom Rath, German mineralogist, who named the species. Originally named marialith (1866).

IMA status : Valid species (Pre-IMA 1866) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
76.03.01.01  
  (76) Tectosilicate Al-Si Framework
  (76.03) Framework with other Be/Al/Si frameworks
  (76.03.01) Scapolite group
  
Nickel-Strunz
(10th edition) :
09.FB.15
  (09) Silicates
  (09.F) Tektosilicates without Zeolitic H2O
  (09.FB) Tektosilicates with additional anions
  
Crystal system: Tetragonal System
Point group (H-M): 4/m — dipyramidal
Space group: I4/m
Unit cell: a = 12.06Å, c = 7.572(3) Å, Z=2
Crystal Habit: Crystals prismatic, typically with flat pyramidal terminations, striated || [001], to 1.5 m; granular, massive.
  
Color: Colorless, white, grey; pink, violet, blue, yellow, brown, orange-brown; colorless in thin section
Diaphaneity: Transparent to opaque
Luster: Vitreous, pearly, resinous
Hardness (Mohs): 5.5 -6
Measured Density: 2.50 - 2.62 g/cm3
Cleavage: {100}, {110}, distinct
Tenacity: Brittle
Fracture: Uneven to conchoidal
Streak: White
  
Polymorphism and Series: Forms a series with meionite; intermediate members are P42/n:
  
Luminescent Properties: Commonly fluoresces orange to bright yellow or red under LW or SW UV or both.
Other Properties: Gemstone Readily Available.

 

Marialite
Origin: Langban mine, Varmland, Sweden
Sample size: 7 x 5 x 1 cm
Photo: Tom Loomis

 

Marialite
(zoom-in of above)

 

Marialite
Variety wernerite
Origin: Gooderham, Ontario, Canada
Sample size: 6 x 1.5 cm
Photo: John Veevaert, Trinity Mineral Co.

 

Marialite
(zoom-in of above)

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