Colourless, greyish, yellowish; colourless in transmitted light
Lustre:
Vitreous
Hardness:
7½
Specific Gravity:
2.347 - 2.372
Crystal System:
Orthorhombic
Name:
Named in 1890 by Waldemar Christofer Brøgger in honor of Axel Hamberg [January 17, 1863 Klara Församling, Stockholm, Sweden - June 28, 1933 Stockholm, Sweden], professor of geography at the University of Uppsala, Sweden, who drew attention to the first specimens.