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Kentbrooksite
Current inventory:  0 gems
 

Kentbrooksite

Chemistry:  (Na,REE)15(Ca,REE)6(Mn2+Zr3Nb[Si25O74]F2 2(H2O)

Discovered in 1996;   IMA status: Valid (IMA Approved).
Kentbrooksite is named after Dr. C. Kent Brooks (1943-), leader of fourteen geological expeditions to the Kangerdlugssuaq area of east Greenland.

 

Classification

   

   

Mineral Classification:

Silicates

Strunz 8th Ed. ID:

8/E.23-20

Nickel-Strunz 10th Ed. ID:

9.CO.10

 

9 : SILICATES (Germanates)
C : Cyclosilicates
O : [Si
9O27]18- 9-membered rings

Related to:

Eudialyte group; Eudialyte - Alluaivite Series

 

 

Crystal Data

   

   

Crystallography:

Trigonal - Ditrigonal Pyramidal

Crystal Habit:

Anhedral to subhedral aggregates to 2cm

Twinning:

None

 

 

Physical Properties

   

 

Cleavage:

None

Fracture:

Uneven

Tenacity:

Brittle

Hardness (Mohs):

5.0 - 6.0

Density:

3.07 - 3.10 (g/cm3)

Luminescence:

None

Radioactivity:

Weak; GRapi = 29,710.44

 

 

Optical Properties

   

   

Color:

Yellowish Brown

Transparency:

Transparent, Translucent

Luster:

Vitreous

Refractive Index:

1.623 - 1.628  Uniaxial ( - )

Birefringence:

0.005

Dispersion:

Weak

Pleochroism:

None

 

 

Occurances

   

   

Geological Setting:

n/a

Common Associations:

n/a

Type Locality:

Amdrup Firth, Kangerlussuaq complex, Kangerlussuaq Firth, Tunu (East Greenland) Province, Greenland

Year Discovered:

1996

View mineral photos:

Kentbrooksite Mineral Photos and Locations

 

 

More Information

   

   

 

Mindat.org
Webmineral.com

 

 


Kentbrooksite is an extremely rare mineral that is a manganese and fluorine rich member of the Eudialyte group of minerals. It is primarily found at
Mt Saint-Hilaire, Quebec, Canada; Kangerlugssuaq Firth, Greenland; Telemark, Norway; Kola Peninsula, Russia; and Tien Shan Mts, Tajikstan. Gem quality crystals are extremely rare and small. Kentbrooksite contains several Rare Earth Elements (REE) such as Lanthanum (La), Cerium (Ce), Praeseodymium (Pr), Neodymium (Nd) and Samarium (Sm) and therefore is weakly radioactive as defined in 49 CFR 173.403 (greater than 70 Bq/gram).
 

  
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