Sections of black åskagenite-(Nd) crystals in feldspar, from the type locality
BO_139
1 Item
Data sheet
- Locality
- Åskagen pegmatite, Värmland, Sweden
- Size category
- Miniature
- Size (cm)
- 6x4x2
- Weight
- 93 g
- Formula
- [Mn2+Nd][Al2Fe3+](Si2O7)(SiO4)O2
- Properties
- Black - brownish black; fragile; slightly radioactive