Meionite

Skapolite-Group, Marialite-Meionite Series.
Formula Meionite: Ca₄[CO₃|(Al₂Si₂O₈)₃]
Mineral class: carbonates
Crystal system: tetragonal
Mohs scale: 5 - 6
Density (g/cm³): 2.74 - 2.78
Refractive index: 1.55 - 1.6
Cleavage: distinct
Colors: colorless, white, grey, yellow, orange, rose, blue, violet, brown
Transparency: transparent - opaque
Luster: vitreous - pearly - resinous
Fluorescence: LW and SW UV: yellow, orange, red
Pleochroism: -
Largest crystal: 70 cm?
Deposits: worldwide
Discovery: 1801
1st Description: 1851 (Scacci)?
Name: from the Greek word "meio-" (less, smaller)

Meionite Mineral

Longest crystal: 0.2 cm

Origin: Bolton / Worcester County / Massachusetts / USA

Photo by kind permission of © Peter Cristofono

Meionite Mineral

Image width: 1.2 cm

Origin: Bolton / Worcester County / Massachusetts / USA

Photo by kind permission of © Peter Cristofono

Meionite Mineral

Size: 7.2 x 4.2 x 1.9 cm

Origin: Pitwak Mine / Kokcha Valley / Badakhshan / Afghanistan

Photo by kind permission of © www.mineralman.com

Meionite

Weight: 0.19 ct

Origin: Kenya-Tanzania border area

Photo by kind permission of © www.irocks.com

Meionite Mineral under UV light

Origin: Pierrepont / St. Lawrence County / New York / USA

Photo by kind permission of © Peter Cristofono

Meionite Mineral under UV light

Height of the crystal: 4 cm

Origin: Sanford / York County / Maine / USA

Photo by kind permission of © Peter Cristofono