Encyclopaedia Britannica, 11th Edition, "Crocoite" to "Cuba"

Encyclopaedia Britannica, 11th Edition, "Crocoite" to "Cuba"

Encyclopaedia Britannica, 11th Edition, "Crocoite" to "Cuba" - Volume 7, Slice 7CROCOITE, a mineral consisting of lead...
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Encyclopaedia Britannica, 11th Edition, "Crocoite" to "Cuba"

Encyclopaedia Britannica, 11th Edition, "Crocoite" to "Cuba"

$19.99 $9.99

Encyclopaedia Britannica, 11th Edition, "Crocoite" to "Cuba"

$19.99 $9.99
Author: Various
Format: eBook
Language: English

Encyclopaedia Britannica, 11th Edition, "Crocoite" to "Cuba" - Volume 7, Slice 7

CROCOITE, a mineral consisting of lead chromate, PbCrO4, and crystallizing in the monoclinic system. It is sometimes used as a paint, being identical in composition with the artificial product chrome-yellow; it is the only chromate of any importance found in nature. It was discovered at Berezovsk near Ekaterinburg in the Urals in 1766; and named crocoise by F. S. Beudant in 1832, from the Greek , saffron, in allusion to its colour, a name first altered to crocoisite and afterwards to crocoite. It is found as well-developed crystals of a bright hyacinth-red colour, which are translucent and have an adamantine to vitreous lustre. On exposure to light much of the translucency and brilliancy is lost. The streak is orange-yellow; hardness 2-3; specific gravity 6.0. In the Urals the crystals are found in quartz-veins traversing granite or gneiss: other localities which have yielded good crystallized specimens are Congonhas do Campo near Ouro Preto in Brazil, Luzon in the Philippines, and Umtali in Mashonaland. Gold is often found associated with this mineral. Crystals far surpassing in beauty any previously known have been found in the Adelaide Mine at Dundas, Tasmania; they are long slender prisms, 3 or 4 in. in length, with a brilliant lustre and colour. ......Buy Now (To Read More)

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Ebook Number: 38622
Author: Various
Release Date: Jan 20, 2012
Format: eBook
Language: English

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