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0 item @ $0.00  

Margarite

#44217

Margarite

#44217
Availability
Sold
Size
8 x 7 x 3 cm - Sm Cabinet 
Formula
CaAl2(Si2Al2)O10(OH)2 (RRUFF)
Locality
Chester Emery mines, Hampden Co., Massachusetts, United States

Large pale pink micaceous crystals to 1.5cm sandwiched between chloritic schists. Excellent specimen.

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.

Large crystals of Margarite are rare. The mineral usually forms scaly or platy aggregates. Margarite typically occurs with diaspore in contact metamorphic deposits (Bernard & Hrysl), also in chlorite schists (Mindat). It is usually occurs associated with corundum, diaspore, tourmaline, staurolite, glauphane, chlorite, and magnetite...in high aluminum 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.

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