Thumbnails
Reederite crystals – 5mm
© Gilles Haineault
(Na,Mn,Fe)15(Y,REE)(CO(SOF)Cl
Reederite-(Y), formerly UK # 102, is extremely rare at MSH. Only a few milligrams are known to exist.
PHYSICAL CHARACTERISTICS:
Color is usually yellow to orange-brown.
Luster is vitreous.
Diaphaneity is transparent to translucent.
Crystal System is hexagonal; 6.
Crystal Habits include blocky grains to 2mm.
Cleavage {001} is perfect.
Fracture is conchoidal.
Hardness is 3 – 3.5
Specific Gravity is approximately 2.85 g/cm
Streak is white.
Associated Minerals include analcime, catapleiite, manganotychite,
petersenite, shortite and trona.
Distinguishing Features: Crystal habit and color.
Origin: Named in 1995 after Richard J. Reeder, American professor
of Geology.
CLASSIFICATION:
Dana System
# 17.1.14.2
Strunz Classification
# V/C.07-200
REFERENCES:
AmMin 80:1059-1064 (1995)
DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:
MSH
¤¤¤