Rock Creek Sapphires

A spectrum of color in sapphires from the Rock Creek Mine, Montana, USA. Photo by Aaron Celestian.
Donation to NHMLA of rough sapphire crystals from Rock Creek. Photo by Stan Celestian.
A 59.5 ct unheated rough sapphire from Rock Creek. As of June 2018, this is the largest crystal that I know of from Montana. A slightly larger one has been found recently. Photo by Aaron Celestian.
The “Montana Princess” is a 12.62 cts heated blue-green sapphire from Rock Creek. As far as I know, it is the largest blue sapphire gem from Montana. Photo by Aaron Celestian.

Keeping science accessible. Researching how minerals can be used to solve problems like climate change, pollution, and disease. @ NHMLA, USC, NASA-JPL

Keeping science accessible. Researching how minerals can be used to solve problems like climate change, pollution, and disease. @ NHMLA, USC, NASA-JPL