|
Hard- ness |
Cleavage |
Fracture |
Trans- parency |
10% HCl Reaction |
SG |
Luster |
Color |
Streak |
Xtal Form |
Mineral Class |
Comments | dumortierite | 7.00 | poor | Uneven | Translucent | none | 3.45 | glassy | blue | blue | acicular | silicates | Blue to violet crystals rare; sometimes reddish-brown. Usually fibrous to radiating aggregates. bluish white streak |
|