Eckermannite - Encyclopedia
Class : Silicates
Subclass : Inosilicates
Crystal system : Monoclinic
Chemistry : Na3Mg4AlSi8O22(OH)2
Rarity : Rare
Eckermannite is a rare sodic amphibole of alkaline plutonic rocks, more rarely of alkaline volcanic rocks and nepheline pegmatites. It forms a series with ferro-eckermannite. It was named in honor of the Swedish petrologist and professor Claes Walther Harry von Eckermann. This mineral occurs in glassy masses. It is most of the time colorless.
Main photo : Eckermannite from Hpakant-Tawmaw Jade Tract, Myanmar © Scapin Giovanni
Eckermannite in the World
Twinning
No twin known for this mineral species.
Fakes and treatments
No fake listed for this mineral species.
Hardness : 5 to 6
Density : 3.02
Fracture : Undetermined
Streak : White
TP : Translucent to transparent
RI : 1.605 to 1.634
Birefringence : 0.029
Optical character : Biaxial -
Pleochroism : None
Fluorescence : None
Solubility : -
Magnetism : None
Radioactivity : None