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Margarite

#BM41816

Margarite

#BM41816
Availability
Sold
Size
9.5 x 5 x 5 cm - Cabinet 
Formula
CaAl2(Si2Al2)O10(OH)2 (RRUFF)
Locality
Chester Emery mines, Hampden Co., Massachusetts, United States

Pinkish grey micaceous Margarite from this classic locality.

Margarite is a phyllosilicate - and  a mica group member. It is defined as dioctahedral brittle mica. Aluminum occupies the (M) octahedral positions with possible subsitutes of lithium, calcium (or possibly Na) at the Interlayer spots, and hydroxyl at the (A) positions. Be and Al can replace Si at the (T) positions. For more information on Mica minerals and other phyllosilicates please reference our article - Click Here.

Margarite occurs rarely as good pseudohexagonal crystals, usually scaly or platy aggregates as is this specimen. Grayish pink to pink, but also yellowish. Occurs mainly with diaspore in contact metamorphic deposits (Bernard & Hrysl), also in chlorite schists (Mindat). Associated with corundum, diaspore, tourmaline, staurolite, glauphane, chlorite, and magnetite...in high aluminun deposits (Handbook of Min.).

Margarite

Formula
CaAl2(Si2Al2)O10(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Lamellar, Massive - Lamellar, Scaly 
Cleavage
Good, None, None 
Luster
Pearly 
Color
white, gray, pinkish gray, yellowish gray 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness

Data courtesy of Webmineral.

Collection
McConlogue Collection
Mineralpedia
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On Dakota Matrix
Previously Sold Margarite
On Dakota Matrix
Other Available Margarite
WebMineral
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Mindat
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