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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, calciomurmanite, celadonite and more from places like Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada, Redruth, Cornwall, England, Sheep Creek, Ravalli Co., Montana, United States, P'yalkimpor Mt, Lovozero Massif, Murmansk Oblast, Russia, Union Carbide mine, Wilson Springs, Garland Co., Arkansas, United States.

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
View Annite
Mindat
View Annite

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

Calciomurmanite

#50435
Locality
P'yalkimpor Mt, Lovozero Massif, Murmansk Oblast, Russia 
Formula
(Na,◻)2Ca(Ti,Mg,Nb)4[Si2O7]2O2(OH,O)2(H2O)4 
Availability
Sold
Size
3 x 1.5 x 1.5 cm - Thumbnail 
Special Info
XRD Confirmed 

Pink micaceous crystals to 1.7mm. Calciomurmanite looks like a mica, but it is not. It is sorosilicate rather than a phyllosilicate, like true micas. Identified by Dr. Igor Pekov.


Calciomurmanite

Special Info
XRD Confirmed

Celadonite

with agate - #DO57590
Locality
Union Carbide mine, Wilson Springs, Garland Co., Arkansas, United States 
Formula
KMgFe3+Si4O10(OH)2 
Availability
Sold
Size
3.5 x 3 x 2 cm - Miniature 

Dark green, very tiny, flakes of Celadonite encrusting beautiful yellow and brown banded agate. In some areas of the agate Pyrite crystal to 0.75mm can be seen.


Celadonite

Formula
KMgFe3+Si4O10(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Earthy, Aggregates, Encrustations 
Cleavage
Perfect, None, None 
Luster
Earthy (Dull) 
Color
gray green, bluish green 
Streak
greenish white 
Class
Monoclinic - Prismatic 
Fracture
Earthy 
Hardness
Collection
Don Owens Collection
SOLD
Celadonite - DO57591
Celadonite - DO57591

Celadonite

#DO57591
Locality
Union Carbide mine, Wilson Springs, Garland Co., Arkansas, United States 
Formula
KMgFe3+Si4O10(OH)2 
Availability
Sold
Size
5 x 3.5 x 3 cm - Miniature 

Dark green radial cones to 2mm. Identified by Don Owens.


Celadonite

Formula
KMgFe3+Si4O10(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Earthy, Aggregates, Encrustations 
Cleavage
Perfect, None, None 
Luster
Earthy (Dull) 
Color
gray green, bluish green 
Streak
greenish white 
Class
Monoclinic - Prismatic 
Fracture
Earthy 
Hardness
Collection
Don Owens Collection

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