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Hyalite Opal

Mineral(s): Opal var. Opal-AN (i.e. 'Hyalite')
Locality: Kopasz Hill, Tarcal, Zemplén (Tokaj) Mts., Borsod-Abaúj-Zemplén Co., Hungary
Specimen size: 1.8 x 1.8 x 3.3 cm

This is a type of opal called hyalite, which can contain anywhere from 3-8% water in its molecular structure. It resembles blobs of water, frozen in midair. The technically correct term is actually opal-AN, in which the "A" stands for "amorphous" (implying its lack of a defined crystal structure - basically just a blob) and the "N" stands for a classification in which its molecular network resembles that of actual glass (the difference of course being that glass doesn't contain this much water).

There are a number of deposits worldwide in which you can find some high-quality hyalite opal, and this locality in Hungary produces some outstanding specimens.
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JAKBunny's avatar
Wow, this one is very mesmerizing. 
sumie--dh's avatar
Very nice, it have all features of good specimen photo ;]