Name/Title
Garnet var. DemantoidEntry/Object ID
2004.1.34Description
Assemblage Zone: pegmatite dikes
Chemical Composition: Ca3Cr2(SiO4)3, Calcium Ch
Crystal System: Cubic or Isometric S
Description: Common Name: Uvarovite
Group Name: Garnets
Chemistry: Ca3Cr2(SiO4)3, Calcium Chromium Silicate
Location: Outokumpu mining district, Outokumpu, North Karelia, Finland
Description: Light gray green rectangle with small dark green blotches.
PHYSICAL CHARACTERISTICS:
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.
Best Field Indicators are crystal habit, color, locality and hardness.
Fracture: conchoidal
Hardness: 6 Orthoclase
Luster: Vitreous
Occurrence: Uvarovite is a chromium bearing garnet group species with the formula: Ca3Cr2(SiO4)3. It was discovered in 1832 by Germain Henri Hess who named it after Count Sergei Semenovitch Uvarov (1765-1855), a Russian statesman and amateur mineral collector.
Uvarovite is one of the rarer of the garnet group minerals, and is the only consistently green garnet species, with a beautiful emerald-green color. It occurs as well-formed fine sized crystals. Specimens of uvarovite are much sought after by collectors for outstanding brilliance and color.
It is found associated with chromium ores in Spain, Russia, and Quebec in Canada. It also occurs in Finland, Norway, and South Africa.
Notable Occurrences are Finland; Sarany, Ural Mountains Region, Russia; California and South Africa.
Rock Type: Metamorphic
Specific Gravity: 3.8
Streak: white
Variety: Uvarovite, like other garnets, forms rounded crystals with 12 rhombic or 24 trapezoidal faces or combinations of these and some other forms. This crystal habit is classic for the garnet minerals. Uvarovite is the only consistently green garnet and has a beautiful emerald-green color. As with the other calcium garnets (andradite and grossular), uvarovite is formed from the metamorphism of impure siliceous limestones and some other rocks that contain chromium. Mineral specimens of uvarovite are much sought after by collectors for outstanding brilliance and color.Collection
Suomynona Mineral Collection, Suomynona CollectionDimensions
Width
3 inDepth
2-1/2 inLength
4-1/2 inWeight
1.3 ozDimension Notes
Dimension taken at widest pointsLocation
Location
Display Case
FS-9Room
Frieda Smith HallBuilding
Crater Rock MuseumCategory
ExhibitMoved By
Ian C.Date
January 29, 2025Notes
Location/inventoryLocation
Display Case
FS-4Room
Frieda Smith HallBuilding
Crater Rock MuseumCategory
PermanentDate
August 18, 2023