margarite
Sign in to saveMargarite is a calcium rich member of the mica group of the phyllosilicates with formula: CaAl2(Al2Si2)O10(OH)2. It forms white to pinkish or yellowish gray masses or thin laminae. It crystallizes in the monoclinic crystal system. It typically has a specific gravity of around 3 and a Mohs hardness of 4. It is translucent with perfect 010 cleavage and exhibits crystal twinning.
Key facts
- Mineral.name
- Margarite
- Mineral.image
- Margarite-181325.jpg
- Mineral.caption
- Margarite from the Wright Mine, Chester Emery Mines, Chester, Hampden County, Massachusetts, USA. Size: 4.8 x 3.4 x 2.6 cm.
- Mineral.category
- Phyllosilicate minerals
- Mineral.group
- Mica group, brittle mica group
- Mineral.formula
- CaAl2(Al2Si2)O10(OH)2
- Mineral.IMAsymbol
- Mrg
- Mineral.strunz
- 9.EC.30
- Mineral.system
- Monoclinic
- Mineral.class
- Domatic (m) (same H-M symbol)
- Mineral.symmetry
- Cc
- Mineral.color
- flesh pink
- Mineral.habit
- platy
- Mineral.cleavage
- basal
- Mineral.mohs
- 4
via Wikipedia infobox
Wikidata facts
- Image
- Margarite-202074.jpg
Show 6 more facts
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 9.EC.30
- Commons category
- Margarite
- Nickel-Strunz 9th edition (updated 2009)
- 9.EC.30
- IMA Mineral Symbol
- Mrg
- chemical formula
- CaAl₂(Si₂Al₂)O₁₀(OH)₂
- Strunz 8th edition (series ID, updated)
- VIII/E.06
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Margarite is a calcium rich member of the mica group of the phyllosilicates with formula: CaAl2(Al2Si2)O10(OH)2. It forms white to pinkish or yellowish gray masses or thin laminae. It crystallizes in the monoclinic crystal system. It typically has a specific gravity of around 3 and a Mohs hardness of 4. It is translucent with perfect 010 cleavage and exhibits crystal twinning.
It occurs commonly as an alteration product of corundum, andalusite and other aluminous minerals. It has been reported as forming alteration pseudomorphs of chiastolite along with muscovite and paragonite. The margarite in this occurrence forms preferentially along the dark graphite rich inclusions with the chiastolite crystals.