Mineralpedia Details for Muscovite
Muscovite
- Formula
- KAl2(Si3Al)O10(OH)2
- Crystal System
- Monoclinic
- Crystal Habit
- Massive - Lamellar, Foliated, Micaceous
- Cleavage
- Perfect, None, None
- Luster
- Vitreous (Glassy)
- Color
- white, gray, silver white, brownish white, greenish white
- Streak
- white
- Class
- Monoclinic - Prismatic
- Fracture
- Brittle - Sectile
- Hardness
- 2-2.5
- WebMineral
- View Muscovite
- Mindat
- View Muscovite
Muscovite from Binntal, Wallis, Switzerland
Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Dioctahderal.
Rich chromium Muscovite.
Muscovite from Walden Gem quarry, Portland, Middlesex Co., Connecticut, United States
Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Dioctahderal. You might call Muscovite the generic mica or the original mica to which all subsequent micas were modelled after.
This specimen may contain Rb, which causes the "ruby" color.
Muscovite from Rutherford Co., North Carolina, United States
Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Dioctahderal.
Green flakes of chromium rich Muscovite with red corundum.
Muscovite from Lengenbach quarry, Binn Valley, Wallis, Switzerland
Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Dioctahderal.
This locality demonstrates the diversity in which Muscovite occurs. At Lengenbach, hydrothermal mineralization of base metals occured in Triassic dolostones in which at least 130 minerals (Mindat) have been identified. Muscovite being just incidental to tht overall selection of rare sulfides and sulfosalts.
On this piece, Muscovite crystals occur as slightly pale green platy crystals.
Muscovite from Franklin, Sussex Co., New Jersey, United States
Large dep brown foliated plate of Muscovite, although this one could easily be Hendricksite of a Biotite.
Muscovite from Warren Brothers quarry, Bristol Co., Massachusetts, United States
This specimen contains hundreds of pseudohexagonal platy crystals to 7-10mm.
Muscovite from Branchville quarry, Branchville, Fairfield Co., Connecticut, United States
An excellent example of "ball-peen" muscovite.
Muscovite from Aldeia do Eme mine, Conselheiro Pena, Minas Gerais, Brazil
A little worn but an outstanding example of a complete Muscovite crystal showing rosette-like growth. Good looking on front and back. Ruby red internal reflections. Ex. Art Smith
Muscovite from Barra do Salinas, Coronel Murta, Minas Gerais, Brazil
A cleavage slice of interesting Muscovite rimmed by perhaps Lepidolite.
Muscovite from Conselheiro Pena, Minas Gerais, Brazil
A very nice plate of ruby colored Muscovite with crystals to 4.5cm across. With the Muscovite are dark green prismatic Fluorapatite to 1.4cm.
Muscovite from Bahia, Brazil
A large specimen of fuchsite, the chromium variety of Muscovite. The true color is a much better green in hand than the photos show.
Muscovite from Willis Mtn., Farmville dist., Buckingham Co., Virginia, Unites States
Green micaceous chromium bearing Muscovite variety fuchsite.
Muscovite var. allurgite from Saint-Marcel, Aosta Valley, Italy
Pinkish purple flakes throught mass.
Alurgite is a variety of Muscovite with manganese impurity giving it the beautiful red color.
Muscovite from Placer Dome mine, Ontario, Canada
Green layers of fuchsite in schist matrix. This variety of Muscovite contains chromium which replaces the aluminum in the crystal structure. Chromium imparts the green color in fuchsite, but is not the cause of green in other phyllosilicates such as Chamosite or Clinochlore.
