Here are some much better images of samples - lots of different hues.
https://www.google.com/search?q=cobalt+mineral+sample&client=firefox-b&tbm=isch&source=iu&ictx=1&fir=8xH0TUj7n7fREM%253A%252CzWPTTUMK4qm-jM%252C_&usg=__fUmxM4AWNfLDDidX9Da44p5ZeVg%3D&sa=X&ved=0ahUKEwj87d_1x_DXAhUE-2MKHUdpAoQQ9QEIWjAF#imgrc=8xH0TUj7n7fREM: