1. covellite：covelline 铜蓝 | covellite 铜蓝 | cover 外盖
2. covelline：covariance matrix 协方差矩阵 | covelline 铜蓝 | covellite 铜蓝
3. 铜蓝
3. Indigo copper：Sky blue 天蓝 | Indigo copper 铜蓝 | Brown 棕色
4. bronze blue：bronze black 铜黑 | bronze blue 铜蓝 | bronze button 铜钮扣