|
Hard- ness |
Cleavage |
Fracture |
Trans- parency |
10% HCl Reaction |
SG |
Luster |
Color |
Streak |
Xtal Form |
Mineral Class |
Comments | cordierite | 7.00 | poor | conchoidal | Translucent | none | 2.60 | glassy | grey | white | prismatic | silicates | Usually grey but sometimes blue or black. additional info here |
|