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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 annite, fluorannite, and muscovite and more from places like Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada, Redruth, Cornwall, England, Sheep Creek, Ravalli Co., Montana, United States, Katugin Ta-­Nb deposit, Kalarsky dist., Zabaykalsky Krai, Russia, and Gilba Valley, Brossasco, Cuneo, Piedmont, Italy.

Annite

#BW57594
Locality
Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada 
Formula
KFe2+3(Si3Al)O10(OH)2 
Availability
Available
Price
$25.00
Size
4 x 3 x 2 cm - Miniature 

Dark black crystals to 1.7cm, which would usually be called biotite. Most "biotites" are in fact Annite. The crystal on the second photo is pseudohexagonal.

Annite is the iron rich, OH end member, of the Biotite- Phlogopite series. Common in schists, worldwide, occuring up to 3meters (!!) as crystals in granites of Cape Ann near Rockport, Mass. USA, and crystals up to 15cm from MSH (Bernard & Hrysl). Sometimes forming pseudohexagonal outlines, and foliated masses, in Mg poor igneous and metamorphc rocks.

Phyllosilicate Mica group member. Ordinary (True or Common) Mica - Trioctahderal. For more information on Mica minerals and other phyllosilicates please reference our article - Click Here.


Annite

Formula
KFe2+3(Si3Al)O10(OH)2 
Crystal System
Monoclinic 
Cleavage
Perfect, None, None 
Luster
Sub Metallic 
Color
reddish brown, black 
Streak
brownish white 
Class
Monoclinic - Prismatic 
Hardness
2.5-3 
Collection
Bill Wilson Collection
Mineralpedia
View Annite
On Dakota Matrix
Previously Sold Annite
On Dakota Matrix
Other Available Annite
WebMineral
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Mindat
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Annite

#PD57608
Locality
Redruth, Cornwall, England 
Formula
KFe2+3(Si3Al)O10(OH)2 
Availability
Available
Price
$35.00
Size
7 x 5.5 x 3 cm - Sm Cabinet 

Bronzy black Annite flakes throughout mass.

Biotite has historically been treated as an individual mineral species by geologist. Rieder et. al in the Canadian Mineralogist v. 36 (1998), reclassified and placed Biotite within the Annite-Phlogopite series.

Biotite is a phyllosilicate of the Mica group and is classified as an ordinary (True or Common) mica meaning it has flexible cleavage plates. For more information on Mica minerals and other phyllosilicates please reference our article - Click Here.


Annite

Formula
KFe2+3(Si3Al)O10(OH)2 
Crystal System
Monoclinic 
Cleavage
Perfect, None, None 
Luster
Sub Metallic 
Color
reddish brown, black 
Streak
brownish white 
Class
Monoclinic - Prismatic 
Hardness
2.5-3 
Collection
Don Phillips Collection
Mineralpedia
View Annite
On Dakota Matrix
Previously Sold Annite
On Dakota Matrix
Other Available Annite
WebMineral
View Annite
Mindat
View Annite

Annite

- Phlogopite series - #45889
Locality
Sheep Creek, Ravalli Co., Montana, United States 
Formula
KFe2+3(Si3Al)O10(OH)2 
Availability
Available
Price
$30.00
Size
14 x 8 x 1 cm - Cabinet 

A large plate of black to golden black "biotite". Biotite is not a distinct species but falls within the Annite-Phlogopite series. 


Annite

Formula
KFe2+3(Si3Al)O10(OH)2 
Crystal System
Monoclinic 
Cleavage
Perfect, None, None 
Luster
Sub Metallic 
Color
reddish brown, black 
Streak
brownish white 
Class
Monoclinic - Prismatic 
Hardness
2.5-3 
Collection
Chris van Laer Collection
Mineralpedia
View Annite
On Dakota Matrix
Previously Sold Annite
On Dakota Matrix
Other Available Annite
WebMineral
View Annite
Mindat
View Annite

Fluorannite

#PD57597
Locality
Katugin Ta-­Nb deposit, Kalarsky dist., Zabaykalsky Krai, Russia 
Formula
KFe2+3(Si3Al)O10F2 
Availability
Available
Price
$45.00
Size
2 x 2 x 1 cm - Thumbnail 

Black micaceous crystals to 1mm. Rare.

Fluorannite is the fluorine analogue of Annite. It is basically compact black and micaceous. It is actualy quite rare having been found in only three worldwide localities thus far.


Fluorannite

Formula
KFe2+3(Si3Al)O10F2 
Crystal System
Monoclinic 
Crystal Habit
Foliated, Fibrous, Tabular 
Cleavage
Perfect, None, None 
Luster
Sub Metallic 
Color
iron black 
Streak
gray 
Class
Monoclinic - Prismatic 
Fracture
Sectile 
Hardness
Collection
Don Phillips Collection

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
WebMineral
View Muscovite
Mindat
View Muscovite

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