Sonnenstein

Oligoclase
Synonym: Soda-spodumene; Natron-spodumen.
German: Sonnenstein.
Clades: Plagioclase feldspars.
Chemical: Albite, NaAlSi3O8, to Anorthite, CaAl2Si2O8
CrystaL; Triclinic system.
Hardness: 6 to 6.5.
Specific gravity: 2.64 to 2.66.
Color: white, with shades of grey, green, or red
Name: from Greek oligos, little, and klân, to break,