EmimorfiteChemistry: Zn4 Si2 O7 (OH)2 -H2O, Hydrated Zinc Silicate Hydroxide.
Class: Silicates
Subclass: Sorosilicates
Color is blue-green, green, white, colorless, brown and yellow.
Luster is vitreous in large crystals to dull in more compact forms.
Transparency crystals are transparent to translucent.
Crystal System is orthorhombic; mm2
Crystal Habits include the bladed crystal form and the botryoidal form as the most common. The crystals are usually elongated and flat. The terminations are different at each end. One termination is blunted by a pedion face that is usually bevelled by several dome faces. The other end is pointed, being capped by a pyramid. The other common form is botryoidal producing a grape bunch texture. Often the botryoidal form has a cock's comb appearance showing rough crystal terminations.
Cleavage is perfect in one direction.
Fracture is conchoidal to subconchoidal.
Hardness is slightly less than 5.
Specific Gravity is approximately 3.4+ (above average)
Streak is white.
Associated Minerals include limonite, aurichalcite, calcite and smithsonite.
Other Characteristics: strongly pyroelectric and piezoelectric.
Notable Occurrences include Santa Eulalia and Mapimi, Mexico; New Mexico and New Jersey, USA: England and Zambia.
Best Field Indicators are crystal habit, color, density and luster.
Emimorfite - Cina
Immagine:
37,05 KBEmimorfite - Durango, Messico
Immagine:
52,78 KBEmimorfite - Durango, Messico
Immagine:
26,54 KBEmimorfite su Limonite - Messico
Immagine:
27,34 KB(C) Chinellato Matteo cubo = 1 cm.
