Anhedral
From ExoDictionary
Also Xenomorphic or Allotriomorphic
Adjective
- Without having a specified kind or number of surfaces. Something that is not polyhedral.
For Mineral Grains:
- Not having its crystalline form but has its form impressed upon it by the surrounding grains.
From:
- An- -- Meaning Without or Not
- Hedral -- Meaning Having a specified kind or number of surfaces