Description: SELENIUM* fine crystals of selenium (size 2-5mm) on matrix ** nice and rare specimen from classic locality * size: 35 X 24 X 21mmweight: 10g 6E8 origin: Kladno Mine, Libušin, Kladno District, Central Bohemian Region, Czech RepublicNative (i.e., elemental) selenium is a rare mineral, which does not usually form good crystals, but, when it does, they are steep rhombohedra or tiny acicular (hair-like) crystals. Isolation of selenium is often complicated by the presence of other compounds and elements. Selenium is a chemical element with symbol Se and atomic number 34. It is a nonmetal with properties that are intermediate between those of its periodic table column-adjacent chalcogen elements sulfur and tellurium. It rarely occurs in its elemental state in nature, or as pure ore compounds. Selenium (Greek σελήνη selene meaning "Moon") was discovered in 1817 by Jöns Jacob Berzelius, who noted the similarity of the new element to the previously known tellurium (named for the Earth). Selenium is found in metal sulfide ores, where it partially replaces the sulfur. Commercially, selenium is produced as a byproduct in the refining of these ores, most often during production. Minerals that are pure selenide or selenate compounds are known, but are rare. The chief commercial uses for selenium today are in glassmaking and in pigments. Selenium is a semiconductor and is used in photocells. Uses in electronics, once important, have been mostly supplanted by silicon semiconductor devices. Selenium continues to be used in a few types of DC power surge protectors and one type of fluorescent quantum dot. PRIORITY AIR MAIL SHIPPING TO WORLDWIDE 10-20 business days to deliver Shipping charges in accordance to weight COMBINED SHIPPING If you have multiwins, please email to request a combined shipping total to save you on shipping costs.
Price: 400 USD
Location: Ceske Budejovice
End Time: 2024-12-15T01:35:58.000Z
Shipping Cost: 9.5 USD
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Restocking Fee: No
Return shipping will be paid by: Buyer
All returns accepted: Returns Accepted
Item must be returned within: 14 Days
Refund will be given as: Money Back
