Most Total Time Spent in Space. Soviet cosmonaut Sergei Krikalev holds this record, with a little more than 803 days accrued over six spaceflights. That's more than two years and two months spent zipping around the Earth.
Natural citrines are rare. Most commercial citrine is heat-treated amethyst or smoky quartz. Because the color is now caused by finely distributed iron minerals (mostly hematite and goethite), heated amethyst is not a citrine in the strict sense.Quartz colored by inclusions of any kind is not called a citrine.atural citrines are rare. Most commercial citrine is heat-treated amethyst or smoky quartz. Because the color is now caused by finely distributed iron minerals (mostly hematite and goethite), heated amethyst is not a citrine in the strict sense. Quartz colored by inclusions of any kind is not called a citrine.
there is 2 the 1 one is magical retriver it is a lil kinz and the chances of getting it is 1 out of 360 because it is in the webkinz trading card seires 3.rancium is the rarest metal. It is estimated that only 30 grams of it exist in earth's crust. However, most of the artificially created elements on the periodic table near th â¦ e end are equally rare because they only exist for extremely small amounts of time and so they do not exist anywhere in the universe currently.