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Kentbrooksite crystals
© Douglas Merson
Kentbrooksite crystals
© Gilles Haineault
(Na,REE)15(Ca,REE)MnZrNbSi2574 · 2H
During a study of the chemical variation in eudialyte, Johnsen & Gault (1997) discovered that a few of their specimens were characterized by very high contents of Mn and REE. This led to the paper on kentbrooksite. With recent analyses, kentbrooksite was confirmed on samples from Mont Saint-Hilaire. It is one of 4 recent additions from the eudialyte group.
More information on the find is available on the Canadian Museum of Nature article on manganokhomyakovite and new eudialyte group
PHYSICAL CHARACTERISTICS:
Color is usually yellow-brown.
Luster is vitreous.
Diaphaneity is transparent.
Crystal System is trigonal;
Crystal Habits include anhedral to subhedral aggregates to 2cm.
Cleavage is not present.
Fracture is uneven.
Hardness is 5 – 6.
Specific Gravity is approximately 3.10 g/cm
Streak is white.
Associated Minerals include (??).
Distinguishing Features: Requires analysis for confirmation. Brittle,
no fluorescence.
Origin: Named in 1998 for C. Kent Brooks, leader of 14 gelological
expeditions to Kangerdlugssuaq area of East Greenland.
CLASSIFICATION:
Dana System
# 64.1.1.3
Strunz Classification
# VIII/E.25-30
REFERENCES:
EJM 10:207-219 (1998)
DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:
MSH
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