Thumbnails
Doyleite crystals
© Reproduced courtesy of
Canadian
Museum of Nature
Ottawa, Canada
Doyleite crystals
© Reproduced courtesy of
Canadian
Museum of Nature
Ottawa, Canada
Al(OH)
Doyleite, formerly UK #45, was described from Mont Saint-Hilaire in 1985. It is extremely rare at the site.
PHYSICAL CHARACTERISTICS:
Color is usually colorless to white or beige.
Luster is vitreous to pearly to dull.
Diaphaneity is transparent to translucent to opaque.
Crystal System is triclinic; 1.
Crystal Habits include small square tabular crystals to 8mm with
a layered micaceous structure forming rosettes.
Cleavage {010} is perfect and {100} is much less distinct.
Fracture is (??).
Hardness is 2.5 – 3.
Specific Gravity is approximately 2.48 g/cm
Streak is white.
Associated Minerals include albite, fluorite, molybdenite, pyrite,
siderite and zircon.
Distinguishing Features: Crystal habit.
Origin: Named in 1985 for E.J. Doyle (b. 1905), Canadian physician
and mineral collector, who first found the mineral.
CLASSIFICATION:
Dana System
# 6.3.4.1
Strunz Classification
# IV/F.2-40
REFERENCES:
CanMin 23:21-28 (1985), MinRec 21:306 (1990), Dana 8:282 (1997)
DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:
MSH
¤¤¤