Sapphire crystal
Sapphire is a blue variety of corundum, which is the second hardest natural substance known on Earth. Specimen originates from Olberg, Rheinland, now at the Natural History Museum, London
Picture No
10710268
Media ID
47581973
Size
3038px x 3063px
(8.3MB)
Credit
Mary Evans / Natural History Museum
Source
Photograph from the Natural History Museum Collection
