August 24:—SAN ANTONIO, TEXAS: Retail show; Southwest Gem and Mineral Society of San Antonio; Sat. 10-5
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 Post subject: "Light beams" in quartz
PostPosted: Mon Jan 07, 2019 2:52 am 
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The "light beams" are consist of numerous needle-like inclusions.
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Video:
https://www.youtube.com/watch?v=ph1k2KNPg2M


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 Post subject: Re: "Light beams" in quartz
PostPosted: Tue Jan 08, 2019 6:30 am 
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Rutile? Although I would have expected longer needles.


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 Post subject: Re: "Light beams" in quartz
PostPosted: Tue Jan 08, 2019 12:34 pm 
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Alan F. wrote:
Rutile? Although I would have expected longer needles.

I'm not sure, Tremolite is also possible.


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 Post subject: Re: "Light beams" in quartz
PostPosted: Tue Jan 08, 2019 1:06 pm 
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It looks very similar to dumortierite in rose quartz. That said I have gotten different results cabbing sheeny lemon quartz (which this resembles) vs rose quartz. Rose quartz tends to produce a 6 ray star, while lemon quartz produced an n-ray star, maybe 24 legs? So many I had trouble counting. Pretty diffuse and best seen with transmitted light.

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 Post subject: Re: "Light beams" in quartz
PostPosted: Wed Jan 09, 2019 1:20 am 
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Stephen Challener wrote:
It looks very similar to dumortierite in rose quartz. That said I have gotten different results cabbing sheeny lemon quartz (which this resembles) vs rose quartz. Rose quartz tends to produce a 6 ray star, while lemon quartz produced an n-ray star, maybe 24 legs? So many I had trouble counting. Pretty diffuse and best seen with transmitted light.

Thank you and I agree with you.
It seems that only lemon quartz can produce 18 ray star, but rose quartz can sometimes produce 12 ray star(just very rare).
Found some pics online:


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 Post subject: Re: "Light beams" in quartz
PostPosted: Thu Jan 24, 2019 9:30 am 
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Not sure if this one contains the same inclusions(the blue inclusions).


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