Me parece uma turmalina, não sei bem que pedra é esta mas é muito bonita, coisas da Mãe Natureza. Colocado dentro de uma cristaleira, ou dentro de uma pirâmide em vidro dá um efeito fantástico, sem contar a energia boa que os cristais emanam - Sensacional  , adorei !

Me parece uma turmalina, não sei bem que pedra é esta mas é muito bonita, coisas da Mãe Natureza. Colocado dentro de uma cristaleira, ou dentro de uma pirâmide em vidro dá um efeito fantástico, sem contar a energia boa que os cristais emanam - Sensacional , adorei !

Osmium is both the densest and the rarest element that you can dig out of the Earth. It's so hard that it's used (as an alloy) in places with constant pressure and wear, like the tips of fountain pens. One single cubic inch of this stuff weighs nearly a pound, and were you to somehow get a cubic foot of it, it would weigh over 1,400 pounds. Good luck with that, though: last year, the entire U.S. osmium production was only 165 pounds.

Osmium is both the densest and the rarest element that you can dig out of the Earth. It's so hard that it's used (as an alloy) in places with constant pressure and wear, like the tips of fountain pens. One single cubic inch of this stuff weighs nearly a pound, and were you to somehow get a cubic foot of it, it would weigh over 1,400 pounds. Good luck with that, though: last year, the entire U.S. osmium production was only 165 pounds.

Linarite crystals nestled in a vug of Quartz crystal and breccia matrix.

Linarite crystals nestled in a vug of Quartz crystal and breccia matrix.

Fluorite, Cave-in-Rock, Illinois; An awesome example of multi-colored phantomed fluorite.

Fluorite, Cave-in-Rock, Illinois; An awesome example of multi-colored phantomed fluorite.

opalized gastropod,  coober pedy

24.2 cts stolen ----opalised gastropod cooberpedy rare pc 24.20

Travertine (from Italian. Travertino, Lat. Lapis tiburtinus - tibursky stone) - travertine, polycrystalline brittle grained homogeneous rock, formed of calcium carbonate minerals

Travertine (from Italian. Travertino, Lat. Lapis tiburtinus - tibursky stone) - travertine, polycrystalline brittle grained homogeneous rock, formed of calcium carbonate minerals

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