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Odmiany Diamentów | Jubilerski blog

Diament z kosmosu

kwiecień 20th, 2011 by

Lonsdaleit to polimorficzna odmiana diamentu o dużej gęstości atomowej znajdowana w meteorytach. Nie są to diamenty jubilerskie, lecz drobne kryształki diamentu. Jest kilka odmian polimorficznych tego diamentu:

chaoit (nieznany w skałach Ziemi, występuje w meteorytach)
diament
grafit
Lonsdaleit

Lonsdaleit występuje w postaci mikroskopijnych kryształów w meteorytach żelaznych i ureilitach. Powstaje jako  minerał szokowy z grafitu  w wyniku działania wysokiego ciśnienia i temperatury w chwili zderzenia meteorytu z Ziemią.
Rozpoznany i opisany został w pozostałości (ok. 200 mg) po rozpuszczeniu 5 kg meteorytu Canyon Diablo. Jego obecność stwierdzono w meteorytach Goalpara i Allan Hills 77283 oraz w żwirach i glebie w miejscu katastrofy tunguskiej.
Symulacje komputerowe zachowania lonsdaleitu ściskanego w diamentowym twardościomierzu przeprowadzone przez Zichenga Pana z uniwersytetu Jiao Tong w Szanghaju wykazały, że lonsdaleit może być o 58% twardszy od zwykłego diamentu[2] (niższa twardość badanych rzeczywistych próbek lonsdaleitu wynika z obecności zanieczyszczeń). Jeśli badania laboratoryjne potwierdzą wyniki symulacji, to lonsdaleit będzie najtwardszą znaną substancją na […]

Wiecej: diamenty i brylanty

odmiany diamentów, jubilerskie, diamenty