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Lengthy 4.1 cm Mimetite crystal - one of the most significant finds in mineralogical history. From Tsumeb mine, Tsumeb, Otjikoto Region, Namibia

Lengthy 4.1 cm Mimetite crystal - one of the most significant finds in mineralogical history. From Tsumeb mine, Tsumeb, Otjikoto Region, Namibia

Opalised-theropod-dinosaur-tooth.jpg

悠久を経て宝石「オパール」と化した恐竜の牙の化石

Opalised-theropod-dinosaur-tooth.jpg

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 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 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.

Fluorine St-Peray (ref : CP07-19)

Fluorine St-Peray (ref : CP07-19)

Tourmaline; Pederneria Mine, Minas Gerais, Brazil

Tourmaline; Pederneria Mine, Minas Gerais, Brazil

Tourmaline -  Paprok, Nuristan, Afghanistan  5.5 x 2.2 x 1.7 cm

Tourmaline - Paprok, Nuristan, Afghanistan 5.5 x 2.2 x 1.7 cm

"This is what we call good size of gem crystals!" M. Bienkowska photo.  SpiriferMinerals.com - mineral specimens, minerals collecting, high quality minerals, fluorite, tourmaline

"This is what we call good size of gem crystals!" M. Bienkowska photo. SpiriferMinerals.com - mineral specimens, minerals collecting, high quality minerals, fluorite, tourmaline

Clear fluorite / Mineral Friends

Clear fluorite / Mineral Friends

Emerald on Schist - Malyshevo, Ekaterinburg, Sverdlovskaya Oblast’, Middle Urals, Urals Region, Russia

Emerald on Schist - Malyshevo, Ekaterinburg, Sverdlovskaya Oblast’, Middle Urals, Urals Region, Russia

| Aragonite / Minglanilla, Spain

| Aragonite / Minglanilla, Spain

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