| Gemological
Information |
| Color
: |
Red |
| Refractive
Index: |
R.I.
varies with composition, but generally
1.74-1.94. Isometric |
| Hardness: |
6.5-7.5 |
| Crystal
Group: |
Isometric
(cubic) |
| Ocurrence: |
Sri
Lanka, Mexico, Brazil, Canada, Madagascar |
| Various
shades of orange, green, colorless,
yellow, pink. Primarily from the
Umba River Valley of Tanzania.
|
|
|
|
