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Is this gwindel quartz?

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robodoc:
Hi Rien,

in my opinion your last but one photo shows a kind of rotation and I think that this specimen is a gwindel quartz.
To prove it you should take a picture holding your camera over the top of this piece without changing the position of the specimen like you would photograph a spiral staircase downstairs or the DNA-helix mentioned by Michael.

Best regards

Robert

Sebastian:
The Last zwo Fotos Show that this piece  is a Gwindel.
Best regards,
Sebastian

Klaus Schäfer:
Hallo Rien,

Maybe this pictures can give you a better idea about gwindl-quartz.
I sketched a gwindl-quartz from Galenstock, Kanton Wallis, Schweiz.
One sigth from the front, perpendicular to the c-axis.

Is this gwindel quartz?

By the way, gwindles are rare variety of quartz. But esthethically relevant gwindles are extraordinary rare.

Best wishes, Klaus

loismin:
Hello.

The picture 2579 shows good the rotation and this is a gwindel quarz !


Loismin

rienhartman:
Thank you so much all for your explinations and pictures.
I now finally see what makes the quartz a gwindel :)
I now can see myself that the other specimen I posted pictures from is not a gwindel.

Kind regards to all.

Rien

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