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  1. Galleries
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  4. » Moonstone

 
Moonstone...

strane

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Moonstone sent on November 27, 2020 (20:53) by Giorgio Comero. 9 comments, 497 views. [retina]

at 40mm, 1/15 f/11.0, ISO 100, tripod.

.....e gia'...magari fosse un pezzo di Luna...da accanito lettore di fantascienza sarebbe un bel regalo! Certo che questa pietra (da poco entrata nella mia collezione) e' alquanto strana converrete pure voi. Stavo facendo foto sul greto del fiume dopo l'alluvione di inizio Ottobre, quando tornando indietro ho smesso di guardare il paesaggio disastrato che avevo intorno e mi sono concentrato sulla massa enorme di pietre ai miei piedi e tra le varie curiose questa le supera tutte. e' grande quanto un pugno e pesa 317 grammi,reca all'esterno 8 esagoni piu' o meno definiti come questo che e' il migliore....bel dilemma su cosa e come si siano creati,non sono ferrosi in quanto la calamita non attacca,sono fatti da molti cristalli simili ma ben diversi dalla matrice esterna che ingloba il tutto,al di la della qualita' dello scatto e' piu' che altro la voglia di sollevare pure in voi la mia domanda,spero di trovare una persona competente che abbia la risposta.



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avatarsupporter
sent on November 30, 2020 (14:45) | This comment has been automatically translated (show/hide original)

I love stones and this is a really nice specimen, although I do not recognize the materials and the why
of the strange combinations that are sometimes created. I also own one that's practically identical
the largest size.
Congratulations on the shot, a greeting, Mary.

avatarsenior
sent on November 30, 2020 (20:51) | This comment has been automatically translated (show/hide original)

I was convinced that it would be very difficult to find those who answered me... (in tone) on this shot, well I have to think again, it's a bit like looking for the four-leaf clover in a meadow but it seems that I... Found him!... thank you for your comment that by the way expands saying even you own one the same ... (I thought it was almost impossible) and I'd be really curious to check it out! this was collected on the greto del Sesia at Doccio just after the flood where I had gone to document the disaster.... of course it would be nice to find those who explain to us the reason for these hexagonal inclusions with totally different crystals, thanks therefore to your intervention and if you ever wait for further clarifications, hello G

avatarjunior
sent on December 03, 2020 (11:25) | This comment has been automatically translated (show/hide original)

Hi Giorgio, your image intrigued me and so I asked old fellow students for light: the verdict of a nice group of 4 geologists is that the rock is a pegmatite, and that the hexagonal crystals that are seen are corundum, a little altered on the surface and therefore slightly more hollowed out than the surface of the pebble. We hope to have partly answered your doubts! Greetings and a good day, Paola

avatarsenior
sent on December 03, 2020 (21:36) | This comment has been automatically translated (show/hide original)


avatarsenior
sent on December 04, 2020 (14:57) | This comment has been automatically translated (show/hide original)

I think before the flood he had a few more nice surprises, but who knows where he was; after reading the caption and comments I took away some curiosities, really interesting and beautiful this stone; good at shooting it with this beautiful shot. Greetings alberto

avatarjunior
sent on December 04, 2020 (17:58) | This comment has been automatically translated (show/hide original)

Hi Giorgio, in fact your observation about hardness is logical... I will ask for more information!

avatarsenior
sent on December 04, 2020 (19:20) | This comment has been automatically translated (show/hide original)

Alberto thanks always to your interventions that confirm your investigation of every type of shots put on the site, and this is maybe really ... border-line I would say, even to Paola that I have tedious in various ways a thank you for her availability, to both hello G.

avatarsupporter
sent on December 31, 2020 (23:44) | This comment has been automatically translated (show/hide original)

Quartz, mica, biotite and, I think, orthoclase.
Deagons... It seems correct to me what Paola says, aluminum sesquioxide (Al2O3) or corundum, used for spheres (bearings) and other mechanical processes able not to wear out and withstand over 1400 °C.
The recess hangs from what was there and now it's gone.
I have studied only one geology exam and therefore I am not very sure, but the subject has always fascinated me.
Buon 2021
Paolo

avatarsenior
sent on January 01, 2021 (17:51) | This comment has been automatically translated (show/hide original)

Your comento Paolo, was a real gift at the end of the year and, in addition to the previous ones, they continue to give me information about this small stone, I agree on the mineral matrix even if I do not have large study bases but only a lot of practical experience with cutting materials for mechanical processing, various tools and abrasive grinding wheels of all kinds ... then thank you and the wish (which I extend to everyone)for a better 2021!.... and it would take very little. Hello G


RCE Foto

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