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Rare Minerals

Monday, 20 January 2025 06:00 PM

Introducing the "Rare Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including actinolite, aegerine, aerinite, aeschynite, agrellite, and bakhchisaraitsevite and more from places like Cornog, Chester Co., Pennsylvania, United States, Mont Saint-Hilaire, Montérégie, Québec, Canada, St. Pantaleon, Landes, France, Hittero, Arendal, Norway, Kipawa alkaline complex, Quebec, Canada, and Iron mine, Kovdor Massif, Kola Peninsula, Russia.

Actinolite

#BAC65360
Locality
Cornog, Chester Co., Pennsylvania, United States 
Formula
Ca2(Mg,Fe2+)5Si8O22(OH)2 
Availability
Sold
Size
4.5 x 2 x 1 cm - Miniature 

Green fibrous needle-like crystals.


Actinolite

Formula
Ca2(Mg,Fe2+)5Si8O22(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Bladed, Radial, Fibrous 
Cleavage
Perfect, Perfect, None 
Luster
Vitreous (Glassy) 
Color
green, green black, gray green, black 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Splintery 
Hardness
5.5 
Collection
William & Anne Cook Collection

Aegerine

#BAC65355
Locality
Mont Saint-Hilaire, Montérégie, Québec, Canada 
Formula
NaFe3+Si2O6 
Availability
Available
Price
$15.00
Size
4.1 x 0.2 x 0.3 cm - Miniature 

Slender, terminated single crystal.


Collection
William & Anne Cook Collection
On Dakota Matrix
Previously Sold Aegerine
On Dakota Matrix
Other Available Aegerine
WebMineral
View Aegerine
Mindat
View Aegerine
SOLD
Aerinite - BAC65346
Aerinite - BAC65346

Aerinite

#BAC65346
Locality
St. Pantaleon, Landes, France 
Formula
(Ca5.1Na0.5)(Fe3+,Al,Fe2+,Mg)4(Al,Mg)6[HSi12O36(OH)12][(CO3)1.2(H2O)12
Availability
Sold
Size
4.5 x 3 x 2 cm - Miniature 

Blue vein of Aerinite. Aerinite forms along thin fractues in mafic rocks from hydrothermal fluids.


Aerinite

Formula
(Ca5.1Na0.5)(Fe3+,Al,Fe2+,Mg)4(Al,Mg)6[HSi12O36(OH)12][(CO3)1.2(H2O)12
Crystal System
Trigonal 
Crystal Habit
Fibrous 
Luster
Vitreous (Glassy) 
Color
blue, blue green, sky blue 
Streak
bluish white 
Class
Trigonal - Ditrigonal Pyramidal 
Hardness
Collection
William & Anne Cook Collection
Mineralpedia
View Aerinite
On Dakota Matrix
Previously Sold Aerinite
On Dakota Matrix
Other Available Aerinite
WebMineral
View Aerinite
Mindat
View Aerinite
SOLD
Aeschynite - BAC65354
Aeschynite - BAC65354

Aeschynite

#BAC65354
Locality
Hittero, Arendal, Norway 
Availability
Sold
Size
3 x 1 x 1.5 cm - Thumbnail 

Partial crystal showing two faces.


Collection
William & Anne Cook Collection

Agrellite

#BAC65347
Locality
Kipawa alkaline complex, Quebec, Canada 
Formula
NaCa2Si4O10
Availability
Sold
Size
7.5 x 3.5 x 2 cm - Sm Cabinet 
Special Info
Fluorescent 

Light greenish grey crystal section. Agrellite fluoresces orange under both SW and LW.


Agrellite

Formula
NaCa2Si4O10
Crystal System
Triclinic 
Crystal Habit
Lath 
Cleavage
Perfect, Perfect, Poor 
Luster
Vitreous - Pearly 
Color
white, grayish white, greenish white 
Streak
white 
Class
Triclinic - Pinacoidal 
Hardness
5.5 
Collection
William & Anne Cook Collection
Special Info
Fluorescent
Mineralpedia
View Agrellite
On Dakota Matrix
Previously Sold Agrellite
On Dakota Matrix
Other Available Agrellite
WebMineral
View Agrellite
Mindat
View Agrellite
SOLD
Bakhchisaraitsevite - BAC65297
Bakhchisaraitsevite - BAC65297

Bakhchisaraitsevite

#BAC65297
Locality
Iron mine, Kovdor Massif, Kola Peninsula, Russia 
Formula
Na2Mg5(PO4)4·7H2
Availability
Sold
Size
1 x 1 x 0.3 cm - Thumbnail 
Tagged
phosphate  

Honey yellow platy crystals in aggregates.


Bakhchisaraitsevite

Formula
Na2Mg5(PO4)4·7H2
Crystal System
Monoclinic 
Crystal Habit
Fan Shaped, Aggregates, Bladed 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, yellowish white, greenish white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
2-2.5 
Collection
William & Anne Cook Collection

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