|
|
|
| Amorphous, sometimes mammillary. Conchoidal fracture. |  Opal |
| Usually in columnar or fibrous masses | Wollastonite |
| Small rounded grains | Periclase |
| Fluoresces white or yellow in UV light | Scheelite |
Under development
|
|
|
| Amorphous, sometimes mammillary. Conchoidal fracture. | Opal |
| Usually in columnar or fibrous masses | Wollastonite |
| Small rounded grains | Periclase |
| Fluoresces white or yellow in UV light | Scheelite |