General Information:
Chemical Formula:
(Na,REE)15(Ca,REE)6Mn++Zr3NbSi25O74F2·2(H2O)
Environment:
A manganese and fluorine rich member of the eudialyte group in alkaline pegmatite bodies cutting pulaskite rocks.
IMA Status:
Approved IMA (Dana # Added)
Locality:
Amdrup Fjord, Kangerdlugssuaq intrustion, East Greenland.
Name Origin:
For Dr. C. Kent Brooks (1943-), leader of fourteen geological expeditions to the Kangerdlugssuaq area of east Greenland.
Physical Properties:
Cleavage:
None
Color:
yellowish brown.
Density:
3.07 - 3.1, Average = 3.08
Diaphaniety:
Transparent
Habits:
Anhedral Grains - Granular minerals without the expression of crystal shapes, Aggregates - Made of numerous individual crystals or clusters.,
Hardness:
5-6 - Between Apatite and Orthoclase
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
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