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Rare Minerals

Friday, 12 April 2024 06:00 PM

Introducing the "Rare Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including carpholite, cassedanneite, clinozoisite, fedotovite, ferrovalleriite, and grunerite and more from places like Horni Slavkov, Bohemia, Czech Republic, Berezovskoe Au dep., Berezovskii, Sverdlovskaya Oblast', Urals, Russia, Alchuri, Shigar Valley, Balistan, Northern Areas, Pakistan, Tolbachik Volcano, Kamchatka, Russia, Oktyabr'skoe Cu-Ni deposit, Talnakh, Noril'sk, Siberia, Russia, and Penge mine, Limpopo, South Africa.

Carpholite

#BAC63835
Locality
Horni Slavkov, Bohemia, Czech Republic 
Formula
Mn2+Al2Si2O6(OH)4 
Availability
Sold
Size
4.5 x 3.8 x 1.8 cm - Miniature 

Beautiful golden sprays to 1cm across. I had a hard time capturing the golden color so the color online is not as good as it is in hand.


Carpholite

Formula
Mn2+Al2Si2O6(OH)4 
Crystal System
Orthorhombic 
Crystal Habit
Radial, Fibrous, Massive - Fibrous 
Cleavage
Imperfect, Imperfect, Imperfect 
Luster
Silky 
Color
straw yellow, greenish gray, yellowish brown 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Uneven 
Hardness
5.5 
Collection
William & Anne Cook Collection

Cassedanneite

and unknown - #BAC63926
Locality
Berezovskoe Au dep., Berezovskii, Sverdlovskaya Oblast', Urals, Russia 
Formula
Pb5(VO4)2(CrO4)2·H2
Availability
Sold
Size
0.9 x 0.7 x 0.8 cm - Thumbnail 
Tagged
vanadium  
Special Info
Type Locality 

Orange crystalline Cassedanneite. In the fourth photo are micro yellow acicular of which do not know. Somebody needs to buy and analyze these crystals.


Cassedanneite

Formula
Pb5(VO4)2(CrO4)2·H2
Crystal System
Monoclinic 
Crystal Habit
Microscopic Crystals, Platy 
Luster
Resinous - Greasy 
Color
red orange 
Streak
yellow orange 
Class
Monoclinic - Prismatic 
Hardness
3.5 
Collection
William & Anne Cook Collection
Special Info
Type Locality

Clinozoisite

#CL63950
Locality
Alchuri, Shigar Valley, Balistan, Northern Areas, Pakistan 
Formula
Ca2Al3(Si2O7)(SiO4)O(OH) 
Availability
Sold
Size
6.5 x 4.5 x 4 cm - Sm Cabinet 
Tagged
Nice piece.  

Highly lustrous, striated prismatic crystals to 1.3cm.


Clinozoisite

Formula
Ca2Al3(Si2O7)(SiO4)O(OH) 
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Massive - Granular, Fibrous 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, green, gray, yellow green, light yellow 
Streak
grayish white 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
Collection
Chet S. Lemanski, Jr. Collection

Fedotovite

#63666
Locality
Tolbachik Volcano, Kamchatka, Russia 
Formula
K2Cu3O(SO4)3 
Availability
Sold
Size
4.5 x 2.2 x 2.8 cm - Miniature 
Tagged
copper  
Special Info
Type Locality 
Special Info
XRD Confirmed 
Special Info
EDS Confirmed 

Rich and excellent emerald green crystal group throughout specimen. ID by Dr. Igor Pekov. Fedovite is very rare worldwide occuring in just two main deposits.


Fedotovite

Formula
K2Cu3O(SO4)3 
Crystal System
Monoclinic 
Crystal Habit
Encrustations 
Cleavage
Perfect, None, None 
Luster
Vitreous - Silky 
Color
blue green, emerald green 
Streak
light green 
Class
Monoclinic - Prismatic 
Hardness
2.5 
Special Info
Type Locality
Special Info
XRD Confirmed
Special Info
EDS Confirmed

Ferrovalleriite

#63929
Locality
Oktyabr'skoe Cu-Ni deposit, Talnakh, Noril'sk, Siberia, Russia 
Formula
2(Fe,Cu)S · 1.5Fe(OH)2 
Availability
Available
Price
$275.00
Size
1.3 x 0.8 x 0.4 cm - Thumbnail 
Special Info
Type & Only Locality 

Very soft and sectile black Ferrovalleriite with curved habit. This mineral is similar to Ilmenite in color and habit, but easily distinguished by it softness, which is 1 on the hardness scale. The crystal at the arrow is 2mm, however the entire crystal is 5mm across the face. It is associated with Chalcopyrite. The original label is one like that of Dmitriy Belakovskiy's. 


Special Info
Type & Only Locality

Grunerite

#BAC63934
Locality
Penge mine, Limpopo, South Africa 
Formula
□Fe2+7Si8O22(OH)2 
Availability
Sold
Size
19 x 2 x 1.5 cm - Cabinet 

Large, long specimen of fibrous Grunerite.


Grunerite

Formula
[box]Fe2+7Si8O22(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Fibrous, Columnar, Massive 
Cleavage
Perfect, Distinct, None 
Luster
Vitreous - Pearly 
Color
ashen, brown, brownish green, dark gray 
Streak
colorless 
Class
Monoclinic - Prismatic 
Fracture
Sub Conchoidal 
Hardness
5-6 
Collection
William & Anne Cook Collection

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