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Rare Mineral Specimens

Friday, 03 March 2017 06:00 PM

Introducing the "Rare Mineral Specimens" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including almeidaite, arsiccioite, byzantievite, covellite, eleomelanite, and ilirneyite and more from places like Mula claim, Tapera, Novo Horizonte, Bahia, Brazil, Monte Arsiccio mine, Stazzema, Lucca, Tuscany, Italy, Darai-Pioz Glacier, Alayskiy Range, Tien Shan Mts, Tajikistan, Butte dist., Silver Bow Co., Montana, United States, Tolbachik Volcano, Kamchatka, Russia, and Sentyabr'skoe Ag-Au deposit, Ilirney ore district, Western Chukotka, Russia.

Almeidaite

- Crichtonite Group member - #46498
Locality
Mula claim, Tapera, Novo Horizonte, Bahia, Brazil 
Formula
PbZn2(Mn,Y)(TI,Fe3+)18O37(OH,O) 
Availability
Available
Price
$95.00
Size
1.5 x 1 x 0.3 cm - Thumbnail 
Tagged
REE mineral  
Special Info
Type Locality 

Almeidaite is a five-locality mineral first found at this locality, the Mula claim in Novo Horizonte.  It is a member of the Crichtonite group said to include thirteen complex titanites often containing uranium, lead and rare earth elements such as yttrium, cerium, lanthanum. It is formed from hydrothermaly altered dacites in the presence of rutile and hematite. It is often confused with ilmenite and hematite. Simple physical tests will distinguish theses minerals from Almeidaite however. 


Special Info
Type Locality

Arsiccioite

#46421
Locality
Monte Arsiccio mine, Stazzema, Lucca, Tuscany, Italy 
Formula
AgHg2TlAs2S6 
Availability
Sold
Size
3 x 1.5 x 2 cm - Thumbnail 
Tagged
sulfide , mercury , silver  
Special Info
Type Locality 
Special Info
XRD Confirmed 
Special Info
EDS Confirmed 
Special Info
Author's Material 

Red crystal grains in Baryte matrix. Author's material. Arsiccioite is a one locality mineral and extremely rare.


Special Info
Type Locality
Special Info
XRD Confirmed
Special Info
EDS Confirmed
Special Info
Author's Material

Byzantievite

with Calcibeborosilite - #BN46509
Locality
Darai-Pioz Glacier, Alayskiy Range, Tien Shan Mts, Tajikistan 
Formula
Ba5(Ca,REE,Y)22(Ti,Nb)18(SiO4)4(PO4,SiO4)4(BO3)9O22[(OH),F]43·1.5H2
Availability
Available
Price
$295.00
Size
Micromount 
Tagged
phosphate , REE mineral  
Special Info
Type Locality 
Special Info
EDS Confirmed 

A tiny colorless crystal fragment to 1mm in epoxy microprobe mount. See provenance tab for complete analytical information and SEM image.


Collection
Dr. Buford L. Nichols Collection
Special Info
Type Locality
Special Info
EDS Confirmed

Covellite

with Pyrite - #45882
Locality
Butte dist., Silver Bow Co., Montana, United States 
Formula
CuS 
Availability
Sold
Size
7 x 6 x 4 cm - Sm Cabinet 
Tagged
sulfide , copper  

Tabular Covellite crystals to over 1cm altered to Chalcocite(?), with much Pyrite.


Covellite

Formula
CuS 
Crystal System
Hexagonal 
Crystal Habit
Platy, Foliated 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
indigo blue, light blue, dark blue, black 
Streak
black gray 
Class
Hexagonal - Dihexagonal Dipyramidal 
Fracture
Brittle 
Hardness
1.5-2 
Collection
Chris van Laer Collection
Mineralpedia
View Covellite
On Dakota Matrix
Previously Sold Covellite
On Dakota Matrix
Other Available Covellite
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Mindat
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NEW IMA
Eleomelanite - 46352
Eleomelanite - 46352

Eleomelanite

#46352
Locality
Tolbachik Volcano, Kamchatka, Russia 
Formula
(K2Pb)Cu4O2(SO4)4 
Availability
Available
Price
$195.00
Size
Chip < 1cm 
Tagged
copper  
Special Info
XRD Confirmed 
Special Info
EDS Confirmed 
Special Info
Type & Only Locality 
Special Info
Author's Material 

This is a specimen from the author's study material, Dr. Igor Pekov. The exact locality is: Arsenatnaya fumarole, Second scoria cone of the Northern Breakthrough of the Great Tolbachik Fissure Eruption, Tolbachik volcano, Kamchatka, Russia. The Eleomelanite is the dark green or black crystal grains in the matrix of Euchlorine.

Please refer to: Pekov, I.V., Zubkova, N.V., Agakhanov, A.A., Chukanov, N.V., Belakovskiy, D.I., Sidorov, E.G., Britvin, S.N. and Pushcharovsky, D.Y. (2016) Eleomelanite, IMA 2015-118. CNMNC Newsletter No. 30, April 2016, page 412; Mineralogical Magazine, 80, 407–413.


Eleomelanite

Special Info
XRD Confirmed
Special Info
EDS Confirmed
Special Info
Type & Only Locality
Special Info
Author's Material
NEW IMA
Ilirneyite - 46356
Ilirneyite - 46356

Ilirneyite

#46356
Locality
Sentyabr'skoe Ag-Au deposit, Ilirney ore district, Western Chukotka, Russia 
Formula
Mg0.5[ZnMn3+(TeO3)3] · 4.5H2
Availability
Available
Price
$225.00
Size
4 x 2.5 x 2.5 cm - Miniature 
Tagged
tellurium  
Special Info
XRD Confirmed 
Special Info
EDS Confirmed 
Special Info
Type & Only Locality 
Special Info
Author's Material 

This is from Dr. Igor Pekov's study material used to describe the mineral. It was recently described by Pekov and others. The publication is pending. The Ilirneyite occurs as pinkish red to brown fibrous crystals, very tiny and less than 0.3mm on this specimen.

Please refer to: Pekov, I.V., Siidra, O.I., Vlasov, E.A., Yapaskurt, V.O., Lukina, E.A., Polekhovsky, Y.S. and Apletalin, A.V. (2015) Ilirneyite, IMA 2015-046. CNMNC Newsletter No. 27, October 2015, page 1225; Mineralogical Magazine, 79, 1229–1236.


Special Info
XRD Confirmed
Special Info
EDS Confirmed
Special Info
Type & Only Locality
Special Info
Author's Material

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