PETROGRAPHIC CHARACTERISTICS
OF UNKNOWN #2
| MATERIAL NAME | |
| HABIT |
Fibrous - straight to curved |
| COLOR AND PLEOCHROISM |
Usually colorless but can have a painted coating
|
| APPROXIMATE
R.I. VALUE |
Closest to 1.55 |
| INTERFERENCE COLORS |
NONE (Isotropic) |
| EXTINCTION |
Not Applicable (Isotropic) |
|
ADDITIONAL DESCRIPTIVE FEATURES |
Commonly associated with round or teardrop-shaped beads of glass (also isotropic) |
| KEY DIAGNOSTIC FEATURES |
Isotropic nature and fibrous form |