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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 annite, and fluorannite and more from places like Redruth, Cornwall, England, and Katugin Ta-­Nb deposit, Kalarsky dist., Zabaykalsky Krai, Russia.

Annite - PD57608
Annite - PD57608

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
Fluorannite - PD57597
Fluorannite - PD57597

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
3 
Collection
Don Phillips Collection
Mineralpedia
View Fluorannite
On Dakota Matrix
Previously Sold Fluorannite
On Dakota Matrix
Other Available Fluorannite
WebMineral
View Fluorannite
Mindat
View Fluorannite

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