Meionite

Meionite is a calcium-rich Scapolite.
General Information
A variety or type of:Scapolite
Chemical Formula
3CaAl
 
2
Si
 
2
O
 
8
· CaCO
 
3
Anthony et al, Handbook of mineralogy (2001)
Photos of natural/un-cut material from mindat.org
Physical Properties of Meionite
Mohs Hardness5 to 6
Anthony et al, Handbook of mineralogy (2001)
Specific Gravity2.78
E. Ya. Kievlenko, Geology of gems (2003)
More from other references
TenacityBrittle
Anthony et al, Handbook of mineralogy (2001)
Cleavage QualityDistinct
Anthony et al, Handbook of mineralogy (2001)
FractureUneven,Conchoidal
Anthony et al, Handbook of mineralogy (2001)
Optical Properties of Meionite
Refractive Index1.556 to 1.600
E. Ya. Kievlenko, Geology of gems (2003)
Optical CharacterUniaxial/-
Anthony et al, Handbook of mineralogy (2001)
Birefringence0.024 to 0.037
E. Ya. Kievlenko, Geology of gems (2003)
Colour
Colour (General)Colorless, white, grey; pink, violet, blue, yellow, orange-brown, brown; colorless in thin section.
Anthony et al, Handbook of mineralogy (2001)
TransparencyTransparent,Translucent,Opaque
Anthony et al, Handbook of mineralogy (2001)
LustreVitreous,Resinous,Pearly
Anthony et al, Handbook of mineralogy (2001)
Fluorescence & other light emissions
Fluorescence (General)Commonly fluoresces orange to bright yellow or red under LW or SW UV or both.
Anthony et al, Handbook of mineralogy (2001)
Crystallography of Meionite
Crystal SystemTetragonal
Anthony et al, Handbook of mineralogy (2001)
HabitCrystals prismatic, typically with flat pyramidal terminations; granular, massive.
Anthony et al, Handbook of mineralogy (2001)
Geological Environment
Where found:Typically in regionally metamorphosed rocks, especially marbles, calcareous gneisses, granulites, and greenschists. Also in skarns, some pegmatites, pneumatolytically or hydrothermally altered mafic igneous rocks, and ejected volcanic blocks.
Anthony et al, Handbook of mineralogy (2001)
Further Information
Mineral information:Meionite information at mindat.org
Significant Gem Localities
Myanmar
 
  • Mandalay Region
    • Pyin-Oo-Lwin District
      • Mogok Township
        • Mogok Valley
Ted Themelis (2008) Gems & mines of Mogok
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