A Geoscience Digital Image Library

TitleCorundum, var. ruby, from Cascade Canyon, California
DescriptionRuby, Al2O3, is the red variety of corundum, one of the hardest minerals known. Non-red colored varieties of corundum are called sapphire. The red color in ruby is caused by trace amounts of chromium. The best shade of red for ruby is often given the name “pigeon blood red”, but ruby can be any shade of red to almost pink. The crystals shown here are small, less than 1 cm in longest dimension.
LocationUSA ▹ California. Near Cascade Canyon.
PhotographerDarla Sondrol. 2002-03-24.
CollectionWard’s Classroom Collection of Gem Minerals #2.
Key wordscorundum, ruby, California
Tech details360 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens.
GeoDIL number2535