Kentbrooksite

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
More details...