Uvarovite

[McomeMeteorite]

Uvarovite

Chemistry:
 Ca3Cr2(SiO4)3, Calcium Chromium Silicate
Class:
 Silicates
Subclass:
 Nesosilicates
Group:
 Garnets
Uses:
 Gemstones and mineral specimens

Color is a bright green.
Luster is vitreous.
Transparency crystals are transparent to translucent.
Crystal System is isometric; 4/m bar 3 2/m
Crystal Habits include the typical rhombic dodecahedron. But more commonly is found as the 24 sided trapezohedron. Combinations of these forms are common. Massive and granular occurrences are also seen.
Cleavage is absent.
Fracture is conchoidal.
Hardness is 6.5 - 7
Specific Gravity is approximately 3.8 or less (above average for translucent minerals).
Streak is white.
Associated Minerals are chromite and serpentine.
Other Characteristics: index of refraction is 1.86. dodecahedral faces may show striations.
Notable Occurrences are Finland; Sarany, Ural Mountains Region, Russia; California and South Africa.
Best Field Indicators are crystal habit, color, locality and hardness.

Uvarovite - Urali, Russia

Immagine:

37,3?KB

(C) Chinellato Matteo cubo = 1 cm.

[amaltheus]

Please transate!!!

Per la localit?:

Uvarovite - Urali, Russia

Come localit? di provenienza ? un po? generica visto che gli urali sono una catena montuosa di 2.500 km che attraversa approssimativamente da nord a sud la Russia dal Kazakhistan settentrionale fino all'Oceano Artico.
Probabile che il campione arrivi dalla miniera di Saranovskoye, presso l?abitato di Sarany, regione di Gorosavod, Provincia di Perm=Permskaya Oblast, al piede degli urali centro settentrionali


marco