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Recently Released Special Editions

Micaceous Minerals

Saturday, 26 February 2022 08:00 AM

Introducing the "Micaceous Minerals" gallery which is part of our Special Edition galleries. This gallery contains mineral specimens for sale including muscovite and more from places like Bahia, Brazil, Gilba Valley, Brossasco, Cuneo, Piedmont, Italy, Willis Mtn., Farmville dist., Buckingham Co., Virginia, Unites States, Saint-Marcel, Aosta Valley, Italy, and Placer Dome mine, Ontario, Canada.

SOLD
Muscovite - 41238
Muscovite - 41238

Muscovite

var. fuchsite - #41238
Locality
Bahia, Brazil 
Formula
KAl2(Si3Al)O10(OH)2 
Availability
Sold
Size
6.5 x 4 x 3 cm - Sm Cabinet 

Bright geen micaceous mass of fuchsite, a muscovite rich in chromium. It is rich green and exhibits flashy, wavy foliations.

Fuchsite contains up to 4.8% chromiun (Encycl. of Min.) imparting the green color and was originally described from Schwarzenstein in the Zillerthal and named after J. N. von Fuchs (Dana 6th Ed.).

Phyllosilicate - Monoclinic - Mica group member. It is classified as an ordinary (True or Common) Mica - Dioctahedral.

 

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 
Mineralpedia
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On Dakota Matrix
Previously Sold Muscovite
On Dakota Matrix
Other Available Muscovite
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SOLD
Muscovite - 43857
Muscovite - 43857

Muscovite

var. fuchsite - #43857
Locality
Bahia, Brazil 
Formula
KAl2(Si3Al)O10(OH)2 
Availability
Sold
Size
13 x 10 x 2.5 cm - Cabinet 

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

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 
Mineralpedia
View Muscovite
On Dakota Matrix
Previously Sold Muscovite
On Dakota Matrix
Other Available Muscovite
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Mindat
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Muscovite - BW57583
Muscovite - BW57583

Muscovite

variety phengite - #BW57583
Locality
Gilba Valley, Brossasco, Cuneo, Piedmont, Italy 
Formula
KAl2(Si3Al)O10(OH)2 
Availability
Available
Price
$20.00
Size
4 x 3 x 2 cm - Miniature 

White and silvery micaceous mass. Phengite is supposedly a high silica mica. 


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 
Collection
Bill Wilson Collection
Mineralpedia
View Muscovite
On Dakota Matrix
Previously Sold Muscovite
On Dakota Matrix
Other Available Muscovite
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Mindat
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Muscovite - BW57593
Muscovite - BW57593

Muscovite

var. fuchsite - #BW57593
Locality
Willis Mtn., Farmville dist., Buckingham Co., Virginia, Unites States 
Formula
KAl2(Si3Al)O10(OH)2 
Availability
Available
Price
$30.00
Size
5 x 3.5 x 1.2 cm - Miniature 

Green micaceous chromium bearing Muscovite variety fuchsite.


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 
Collection
Bill Wilson Collection
Mineralpedia
View Muscovite
On Dakota Matrix
Previously Sold Muscovite
On Dakota Matrix
Other Available Muscovite
WebMineral
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Mindat
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Muscovite - PD57596
Muscovite - PD57596

Muscovite

var. alurgite - #PD57596
Locality
Saint-Marcel, Aosta Valley, Italy 
Formula
KAl2(Si3Al)O10(OH)2 
Availability
Available
Price
$25.00
Size
5 x 3 x 2 cm - Miniature 

Pinkish purple flakes throught mass.

Alurgite is a variety of Muscovite with manganese impurity giving it the beautiful red color.


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 
Collection
Don Phillips Collection
Mineralpedia
View Muscovite
On Dakota Matrix
Previously Sold Muscovite
On Dakota Matrix
Other Available Muscovite
WebMineral
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Mindat
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SOLD
Muscovite - 55484
Muscovite - 55484

Muscovite

var. fuchsite - #55484
Locality
Placer Dome mine, Ontario, Canada 
Formula
KAl2(Si3Al)O10(OH)2 
Availability
Sold
Size
7 x 5 x 2 cm - Sm Cabinet 

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.


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 
Mineralpedia
View Muscovite
On Dakota Matrix
Previously Sold Muscovite
On Dakota Matrix
Other Available Muscovite
WebMineral
View Muscovite
Mindat
View Muscovite

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