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1 item @ $40.00  

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 phlogopite, roscoelite, tainiolite, and tetraferriannite and more from places like Heřmanov, Žďár nad Sázavou dist., Vysočina, Czech Republic, Srednyaya Padma mine, Zaonezhie pen., Karelia, Russia, Lovozero Massif, Kola Peninsula, Russia, Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada, Magnet Cove, Hot Spring Co., Arkansas, United States, and Silver Crater mine, Bancroft, Ontario, Canada.

Phlogopite

with Anthophyllite - #BW57582
Locality
Heřmanov, Žďár nad Sázavou dist., Vysočina, Czech Republic 
Formula
KMg3(Si3Al)O10(OH)2 
Availability
Sold
Size
5 x 4.5 x 3 cm - Miniature 
Special Info
Type Locality 

An interesting round nodule which at the center is a ellipsoidal mass of golden brown Phlogopite encased in tannish bladed and columnar Anthophyllite.

Phlogopite is the Mg end member of Biotite-Phlogopite series. It is a Phyllosilicate - Monoclinic - Mica group member. Phologpite is classified as an Ordinary (True or Common) Mica - Trioctahderal with Mg at the (M) positions, K as (I), and OH as (A). Mg end member of Biotite-Phlogopite series.

Occurs sometimes as primary mineral in igneous rocks, mainly ultrabasic, in Leucite-pyroxene rock called "Wyomingite", serpentenized dunnites, altered kimberlites, alkaline ultrabasic rocks in Kola, Russia.


Phlogopite

Formula
KMg3(Si3Al)O10(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Micaceous, Scaly, Lamellar 
Cleavage
Perfect, None, None 
Luster
Vitreous - Pearly 
Color
brown, gray, green, yellow, reddish brown 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
2-2.5 
Collection
Bill Wilson Collection
Special Info
Type Locality

Roscoelite

#46482
Locality
Srednyaya Padma mine, Zaonezhie pen., Karelia, Russia 
Formula
KV3+2(Si3Al)O10(OH)2 
Availability
Sold
Size
2.5 x 1 x 1 cm - Thumbnail 
Tagged
vanadium  
Special Info
XRD Confirmed 

Tiny black scales of Roscoelite, a vanadium bearing mica. Identified by Dr. Igor Pekov.


Roscoelite

Formula
KV3+2(Si3Al)O10(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Micaceous, Scaly, Massive 
Cleavage
Perfect, None, None 
Luster
Pearly 
Color
brown green, greenish brown, yellow green, dark brown, dark green 
Streak
greenish white 
Class
Monoclinic - Prismatic 
Hardness
2.5 
Special Info
XRD Confirmed
SOLD
Tainiolite - PD44739
Tainiolite - PD44739

Tainiolite

#PD44739
Locality
Lovozero Massif, Kola Peninsula, Russia 
Formula
KLiMg2Si4O10F2 
Availability
Sold
Size
3.2 x 2 x 2.5 cm - Miniature 

A 1.5cm micaceous crystal of yellowish brown Tainiolite.


Tainiolite

Formula
KLiMg2Si4O10F2 
Crystal System
Monoclinic 
Crystal Habit
Micaceous, Foliated 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
brownish, colorless, greenish brown 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Flexible 
Hardness
2.5-3 
Collection
Don Phillips Collection
SOLD
Tainiolite - 57589
Tainiolite - 57589

Tainiolite

#57589
Locality
Poudrette quarry, Mont Saint-Hilaire, Montérégie, Québec, Canada 
Formula
KLiMg2Si4O10F2 
Availability
Sold
Size
5.5 x 3 x 3 cm - Sm Cabinet 

A silvery yellow plate of Tainolite to 2cm on syenite matrix.

Tainiolite is a Phyllosilicate - Monoclinic - Mica group member. Ordinary (True or Common) Mica - Trioctahedral with lithium and Mg(II), and fluorine in the (A) position.

Occurs as pseudohexagonal tablets to 5cm, as scales, colorless to brownish green. Found in nepheline syenite pegmatites at MSH and Hot Springs, Arkansas.


Tainiolite

Formula
KLiMg2Si4O10F2 
Crystal System
Monoclinic 
Crystal Habit
Micaceous, Foliated 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
brownish, colorless, greenish brown 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Flexible 
Hardness
2.5-3 
SOLD
Tainiolite - AH57598
Tainiolite - AH57598

Tainiolite

#AH57598
Locality
Magnet Cove, Hot Spring Co., Arkansas, United States 
Formula
KLiMg2Si4O10F2 
Availability
Sold
Size
13 x 14.5 x 1.5 cm - Cabinet 

A very large plate of yellowish brown micaceous Tainiolite. 


Tainiolite

Formula
KLiMg2Si4O10F2 
Crystal System
Monoclinic 
Crystal Habit
Micaceous, Foliated 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
brownish, colorless, greenish brown 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Flexible 
Hardness
2.5-3 
Collection
Arnold G Hampson Collection

Tetraferriannite

#BW57584
Locality
Silver Crater mine, Bancroft, Ontario, Canada  
Formula
KFe2+3(Si3Fe3+)O10(OH)2 
Availability
Sold
Size
6 x 4.5 x 1.3 cm - Sm Cabinet 

Large black crystal 5.5cm across. Tetraferriannite is the ferric iron analogue Annite.


Tetraferriannite

Formula
KFe2+3(Si3Fe3+)O10(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Scaly, Massive - Lamellar 
Cleavage
Perfect, None, None 
Luster
Vitreous - Adamantine 
Color
brown, brownish black 
Streak
light brown 
Class
Monoclinic - Prismatic 
Hardness
2.5-3 
Collection
Bill Wilson Collection

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