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Phlogopite crystals - click for larger pic
Phlogopite crystals
Bob Ramik sp.
Photo by Violet Anderson
© Royal Ontario Museum

Phlogopite crystals - click for larger pic
Phlogopite crystals
© Stephan Wolfsried

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Home > Mineral Descriptions > Phlogopite - (2 Photos)



Phlogopite
KMg3Si3AlO10(F,OH)2

     Phlogopite, a member of the mica group is relatively uncommon at MSH. It is much rarer than the other members of the mica group.

PHYSICAL CHARACTERISTICS:

Color is usually brown; tan to gray.
Luster is vitreous to pearly.
Diaphaneity is transparent to translucent.
Crystal System is monoclinic; C2/m.
Crystal Habits include well-formed pseudohexagonal crystals to 5mm
   and as small embedded flakes.
Cleavage {001} is perfect.
Fracture is not apparent due to cleavage.
Hardness is 2 - 2.5
Specific Gravity is approximately 2.9 g/cm3.
Streak is white.
Associated Minerals include albite, amphibole group, ancylite,
   calcite and fluorite.
Distinguishing Features: Crystal habit and cleavage.
Origin: Named in 1841 from the Greek phlogopos, fire-like, alluding
   to its common reddish tinge.

CLASSIFICATION:

Dana System
# 71.2.2b.1

Strunz Classification
# VIII/H.11-30

REFERENCES:
MinRec 21:330 (1990), Dana 8:1456-1458 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
--

AP
--

MX
¤¤

SS
¤¤

MC
--

HF
--

BR
--

SX
--

FR
¤¤

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