Images
Formula: KNa2(Mg4Fesup>3+)Si8O22(OH)2
Inosilicate (chain silicate),
arfvedsonite root name group,
amphibole
Crystal System: Monoclinic
Specific gravity: 3.24 measured, 3.19 calculated
Streak: Grey-green
Colour: Greenish brown
Luminescence: No fluorescence under UV
Environments
Potassic-magnesio-arfvedsonite is a relatively new mineral, approved in 2017.
Localities
At the type locality, the Buhovo-Seslavtsi pluton, Buhovo, Stolichna Municipality, Sofia City Province, Bulgaria,
potassic-magnesio-arfvedsonite occurs in syenitic and
granitic dikes, the product of strongly peralkaline and potassic
magma. Associated minerals include quartz,
K-feldspar,
aegirine-augite,
zircon, magnetite,
ilmenite, titanite,
hematite, pyrite and
galena
(HOM).
Back to Minerals