SELENIUM CRYSTALS ON MATRIX VERY RARE Kladno, CZECH REPUBLIC
Item History & Price
| Reference Number: Avaluer:19915152 |
SELENIUM* little needles (1-3mm) of selenium on matrix ** nice and rare specimen from uncommon classic locality *
size: 34 X 16 X 16mmweight: 4g
4B4
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 pre...sence 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.
00012
size: 34 X 16 X 16mmweight: 4g
4B4
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 pre...sence 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.
00012
