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Dark Green Uvite Cluster

The Mineral uvite




Uvite is an uncommon form of Tourmaline, and it forms different crystal formations than the most of the other Tourmalines. Though it lacks the color diversity as some of the other Tourmaline forms, it does occur in beautiful green and reddish-brown crystals, as well as lustrous submetallic crystals. The name Uvite is derived from the type locality of the Uva Province, in Sri Lanka, where it was first identified.

Uvite can be very similar to Dravite Tourmaline, and they may even occur together. It can sometimes be very difficult to make an exact distinction between the Dravite and the Uvite.
Chemical Formula Ca(Mg,Fe2+)3Al5Mg(BO3)3Si6O18(OH)4
Composition Basic calcium magnesium iron aluminum boro-silicate
Color Light to dark green, light to dark brown, reddish brown, red, purple, brownish-yellow, white, gray, black. May also be multicolored with light and dark brown streakings.
Streak White
Hardness 7.5
Crystal System Hexagonal
3D Crystal Atlas
(Click for animated model) 
Crystal Forms
and Aggregates
Most often in short and stubby crystals with complete terminations. Prismatic crystals are rare. Also occurs in columnar aggregates, equant crystal masses, radiating, and massive. Crystals are occassionally striated.
Transparency Transparent to opaque
Specific Gravity 3.0 - 3.2
Luster Vitreous, submetallic
Cleavage 3,2
Fracture Conchoidal to uneven
Tenacity Brittle
Other ID Marks May fluoresce yellow in shortwave ultraviolet light.
In Group Silicates; Cyclosilicates; Tourmaline Group
Striking Features Colors, crystal forms, and localities.
Environment In metamorphosed Magnesite deposits, and in metamorphic skarns and marbles.
Rock Type Metamorphic
Popularity (1-4) 3
Prevalence (1-3) 3
Demand (1-3) 2


Uvite ON EBAY

VARIETIES
 -  Form of Uvite where part of the hydroxyl is replaced with fluorine. Fluor-uvite was recognized as a distinct mineral species by the IMA in 2010, with the following chemical formula: Ca(Mg,Fe2+)3Al5Mg(BO3)3Si6O18OH)3F


USES
Uvite, being an uncommon form of Tourmaline, is mainly a collectors minerals.

NOTEWORTHY LOCALITIES
Uvite is not a common mineral. The best locality for this mineral is Serra das Éguas, Brumado, Bahia, Brazil, where it occurs in lustrous gemmy red and green crystals. One of the most famous Uvite occurrence in the U.S. is the Bower Powers Farm, Pierrepont, St. Lawrence Co., New York, where lustrous black crystals can be found. Recent analysis of these Powers Farm Uvites have determined them being closer to Dravite. However, most serious collectors still refer to them as Uvite and are in no rush to change their mineral labels.

Brownish-red translucent Fluor-uvite comes from the Bush Farm (also known as the Reese Farm), near Richville, St Lawrence Co., New York. Good crystals from the marbles at Franklin and Hamburg, Sussex Co., New Jersey; and at Amity, Orange Co., New York. In Canada, Uvite comes from the Tait Farm in Dungannon, in the Bancroft District, Ontario, Canada. A new occurrence producing deep emerald-green Uvite has been reported from Mogok, Burma (Myanmar).

COMMON MINERAL ASSOCIATIONS
Calcite, Quartz, Magnesite, Dolomite, Tremlolite, Actinolite, Hematite

DISTINGUISHING SIMILAR MINERALS
Dravite - May be very difficult to distinguish.
Schorl - Usually occurs in different environments, and crystal habits differ.
Garnet - Forms in different crystals.


uvite PHOTOS
 
ADDITIONAL RESOURCES
 
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