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Diasterism...

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mercoledi

Ideal_Rock
Joined
Jun 20, 2006
Messages
2,822
Well, I clicked on this to learn what "disasterism" was.

But this is much, much cooler.
 

cofor

Shiny_Rock
Joined
Jan 7, 2009
Messages
132
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.
 

chrono

Super_Ideal_Rock
Premium
Joined
Apr 22, 2004
Messages
37,511
Really cool quartz.
 

ma re

Ideal_Rock
Joined
Aug 10, 2008
Messages
2,698
Just a quick question - does it need a strong light source to exhibit a star?
 

cofor

Shiny_Rock
Joined
Jan 7, 2009
Messages
132
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
 
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