Mineral Information and Data:

Uvite
CaMg3(Al5Mg)(BO3)3Si6O18(OH)4 [CNMNC approved formula]

Named for the type Locality area: Uva Province, Sri Lanka.

IMA status : Valid species (Pre-IMA 1929) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
61.03b.01.03  (This Dana# Changed)
  (61) Cyclosilicate Six-Membered Rings
  (61.03b) with borate groups (Calcic Tourmaline Subgroup)
  (61.03b.01) Liddicoatite Subgroup
  
Nickel-Strunz
(10th edition) :
09.CK.05
  (09) Silicates
  (09.C) Cyclosilicates
  (09.CK) [Si6O18]12- branched 6-membered single rings, with insular complex anions
  
Crystal system: Trigonal System
Point group (H-M): 3m — ditrigonal-pyramidal
Unit cell: a = 15.97 Å, c = 7.20 Å
Crystal Habit: Crystals short to long prismatic or equant, striated, cross sections are typically triangular with curved, convex sides
  
Color: Brownish black, bluish black, brown, yellowish brown, may be zoned parallel to prism faces
Diaphaneity: Translucent to opaque
Luster: Vitreous to resinous
Hardness (Mohs): About 7.5
Measured Density: 3.0-3.14 g/cm3
Tenacity: Brittle
Fracture: Uneven to conchoidal
Streak: White, light green, light brown
  
Geologic Setting: Typically in calcium-rich rocks subjected to contact metamorphism and metasomatic processes which added boron
Mineral Association: Calcite, dolomite, tremolite, apatite, scapolite
  
Luminescent Properties: May fluoresce weak mustard yellow under SW-UV.
Other Properties: Piezoelectric. Pyroelectric. Gemstone Extremely Rare.
Comments: The Mg-analogue of feruvite.

 

Uvite
uvite on quartz.
Origin: Brumado, Bahia, Brazil
Sample size: 4 x 2 x 2.5 cm
Photo: Tom Loomis

 

Uvite
(zoom-in of above)

 

Uvite
Origin: Bower's Point Farm, Pierrepont, St Lawrence Co.,
New York, United States
Sample size: 5 x 4 x 4 cm
Photo: Tom Loomis

 

Uvite
(zoom-in of above)

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