Diasterism...

[cofor]

... in Rose Quartz Sphere.

 

[mercoledi]

Well, I clicked on this to learn what "disasterism" was.

But this is much, much cooler.

 

[cofor]

Diasterism is the phenomenon that produces a star in a stone by transmitted light as opposed to Epiasterism which produces a star by reflected light. For instance in star sapphires.

 

[mercoledi]

I know, I misread the title the first time...

 

[chrono]

Really cool quartz.

 

[ma re]

Just a quick question - does it need a strong light source to exhibit a star?

 

[cofor]

Yes, like all stones showing asterism the light source has to be distinct and from a single source, a single light bulb will do. Diffused light and many combined light sources do not show star stones at their best.

cofor