Kugla iz Nove Varoši u ulici Nedeljka Čabrinovića je i mene zaintrigirala prije iks godina, jednom sam to ispričao frendu koji živi u Njemačkoj i on je kasnije stupio u kontakt sa nekim profesorom tamo (gledao je Welt der Wunder o sličnoj temi u kojoj je taj profesor nešto pričao). Prvo smo mu poslali slike, a onda sam "odlomio" par komadića i poslao u Njemačku. Evo šta je profa rekao nakon dobijenih slika, a prije dostavljenih uzoraka (iz nekog razloga, dopisivanje je bilo na engleskom):
Citiraj:
As for the peculiar "cannon ball" I'm as well a little bit helpless, and I never before saw a similar subject. I agree that it seems to be too big as to have been used with a catapult. On the other hand, a natural, geologic phenomenon seems to be unlikely as well at first sight. However, regarding the close-ups, I guess that the rock might be a sandstone exhibiting a brownish crust below the ball's surface. This reminds me of much smaller iron-bearing sandstone spheres the name of which I have forgotten and which are sold in shops for esoteric stuff. I put an image of such a doublet sphere to the attachment. The formation of the spheres is thought to be related with the co-called Liesegang rings or Liesegang bands. These bands form in porous rocks upon diffusion and precipitation of dissolutions rich in iron hydroxides. To the attachment, I add a respective photo showing impressive Liesegang bands. Supposed the bands have a more or less spherical shape, I could imaging that upon weathering, megaballs outlined by a crust of iron hydroxide could detach from the host rock. Maybe, the excavated sphere is such a sandstone megaball.
I think a meteoritic origin is less probable, because meteorites in general do not show spherical shapes except for microscopic dimensions. In any case, if you are able to get a small sample (sized a few centimeters only) we could make a petrographic analysis (thin section etc). Moreover, at your next visit to Bosnia you could try to get some informations about the geological ground where the sphere has been excavated. Are there more rocks with similar composition? Sandstones exhibiting brownish Liesegang bands? Do not hesitate to contact me again! It would be nice if we could find an explanation for the origin of the ball.
Nakon analize, profa je rekao sljedeće:
Citiraj:
I have examined your sample, and it proves to be very terrestrial. It is a kind of sandstone, and under the microscope one can clearly observe fragments of fossil wood and charcoal. The spherical form of the large block may be indeed related with a process of dissolution and precipitation and Liesegang ring formation and a subsequent seperation of the sphere from the host rock.
Znači, nothing out of the ordinary...
Što se tiče priče oko kugle, drugi frend je živio u toj ulici (tako sam i vidio kuglu), pa znam sljedeće:
Citiraj:
Tu se prije par godina pocela graditi zgrada, prilikom kopanja rupe za temelje, radnici su nasli tu kuglu, pokusali su je razbiti bagerom ili necim slicnim, ali nije htjela da pukne, otud one pukotine po njoj (to mozda govori o njenoj tvrdoci i sastavu), pa su je izvadili i ostavili kao ukras. Sto se tice toga kakvo je tlo, to bas ne znam ko bi nam mogao reci...
Eto... sve što se htjeli znati, i više od toga...
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