hémimorphite - tradução para francês
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hémimorphite - tradução para francês

SOROSILICATE MINERAL
E557; Zn2SiO4; Zn4(OH)2Si2O7•H2O
  • Hemimorphite "spray" of crystals from [[Durango]], Mexico (size: 2.9 x 2.1 x 2.0 cm)
  • Wenshan]], Yunnan Province, China (size: 9.2 x 4.8 x 3.1 cm)

hémimorphite         
n. hemimorphite, a white mineral; a common ore of zinc

Wikipédia

Hemimorphite

Hemimorphite is the chemical compound Zn4(Si2O7)(OH)2·H2O, a component of mineral calamine. It is a silicate mineral which, together with smithsonite (ZnCO3), has been historically mined from the upper parts of zinc and lead ores. Both compounds were originally believed to be the same mineral and classified as calamine. In the second half of the 18th century, it was discovered that these two different compounds were both present in calamine. They closely resemble one another.

The silicate was the rarer of the two and was named hemimorphite because of the hemimorph development of its crystals. This unusual form, which is typical of only a few minerals, means that the crystals are terminated by dissimilar faces. Hemimorphite most commonly forms crystalline crusts and layers, also massive, granular, rounded and reniform aggregates, concentrically striated, or finely needle-shaped, fibrous or stalactitic, and rarely fan-shaped clusters of crystals.

Some specimens show strong green fluorescence in shortwave ultraviolet light (253.7 nm) and weak light pink fluorescence in longwave UV.