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Butte & Mixed Minerals

Friday, 26 May 2017 07:00 PM

Introducing the "Butte & Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including alabandite, bastnasite-(la), bismuthinite, clinoatacamite, eleomelanite, and pyrite and more from places like Uchucchacua mine, Oyon prov., Lima dept., Peru, Mochalin Log, Kyshtym, South Urals, Russia , Tazna mine, Cerro Tazna, Potosí, Bolivia, Lily mine, Pisco Umay, Ica Dept., Peru, Tolbachik Volcano, Kamchatka, Russia, and St. Louis Tunnel, Rico dist., Dolores Co., Colorado, United States.

Alabandite

#46494
Locality
Uchucchacua mine, Oyon prov., Lima dept., Peru 
Formula
Mn2+
Availability
Available
Price
$175.00
Size
7 x 5 x 5.5 cm - Sm Cabinet 
Tagged
sulfide  

Large dark grey 1.5cm Alabandite crystals with Rhodochrosite. The crystals are large for the species, but not uncommon for the mine.


Alabandite

Formula
Mn2+
Crystal System
Isometric 
Crystal Habit
Massive - Granular, Disseminated, Granular 
Cleavage
Perfect, Perfect, Perfect 
Luster
Sub Metallic 
Color
black, lead gray, brownish gray 
Streak
dark green 
Class
Isometric - Hexoctahedral 
Fracture
Uneven 
Hardness
3.5-4 

Bastnasite-(La)

#46438
Locality
Mochalin Log, Kyshtym, South Urals, Russia  
Formula
LaCO3
Availability
Available
Price
$40.00
Size
Chip < 1cm 
Tagged
carbonate , REE mineral  

Reddish brown 9mm crystalline mass.


Bastnasite-(La)

Formula
LaCO3
Crystal System
Hexagonal 
Crystal Habit
Prismatic, Massive - Granular 
Cleavage
Imperfect, Indistinct, None 
Luster
Vitreous - Greasy 
Color
yellow, reddish brown 
Streak
white 
Class
Hexagonal - Ditrigonal Dipyramidal 
Fracture
Uneven 
Hardness
4-5 

Bismuthinite

#46964
Locality
Tazna mine, Cerro Tazna, Potosí, Bolivia 
Formula
Bi2S3 
Availability
Available
Price
$950.00
Size
7 x 5.5 x 5 cm - Sm Cabinet 
Tagged
sulfide  

These are extremely large crystals of Bismuthinite, the largest crystal is striated and is 4.5cm. The rest of the group is composed of numerous crystals from 1-3cm. The entire group is nothing Bismuthinite and is one of the best I have seen. In fact this locality is known for the size of Bismuthinite crystals. Excellent specimen.


Bismuthinite

Formula
Bi2S3 
Crystal System
Orthorhombic 
Crystal Habit
Prismatic, Massive - Lamellar, Granular 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
gray, silver white, tin white 
Streak
gray 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Sectile 
Hardness

Clinoatacamite

on Calcite - #46965
Locality
Lily mine, Pisco Umay, Ica Dept., Peru 
Formula
Cu2(OH)3Cl 
Availability
Available
Price
$650.00
Size
9 x 7 x 5.5 cm - Sm Cabinet 
Tagged
copper  

The large vug is over 4cm across and is lined with colorless Calcite crystals. Perched on the Calcite are hundreds of splendid dark green, pseudorhombohedral crystals of Clinoatacamite. The largest crystal is 5mm across! This mine, the Lily, is probably the best locality for the species. 


Clinoatacamite

Formula
Cu2(OH)3Cl 
Crystal System
Monoclinic 
Crystal Habit
Crystalline - Fine 
Cleavage
Perfect, None, None 
Luster
Adamantine 
Color
green, dark greenish black, greenish blue 
Streak
greenish white 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
SOLD
Eleomelanite - 46353

Eleomelanite

#46353
Locality
Tolbachik Volcano, Kamchatka, Russia 
Formula
(K2Pb)Cu4O2(SO4)4 
Availability
Sold
Size
Chip < 1cm 
Tagged
copper  
Special Info
Type Locality 
Special Info
XRD Confirmed 
Special Info
EDS Confirmed 
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
Type Locality
Special Info
XRD Confirmed
Special Info
EDS Confirmed
Special Info
Author's Material

Pyrite

#42734
Locality
St. Louis Tunnel, Rico dist., Dolores Co., Colorado, United States 
Formula
FeS2 
Availability
Available
Price
$65.00
Size
4 x 3.5 x 2.5 cm - Miniature 
Tagged
sulfide  

Brassy gold, deeply striated single Pyrite crytsal.


Pyrite

Formula
FeS2 
Crystal System
Isometric 
Crystal Habit
Striated, Druse, Stalactitic 
Cleavage
Poor, Poor, None 
Luster
Metallic 
Color
pale brass yellow 
Streak
greenish black 
Class
Isometric - Diploidal 
Fracture
Conchoidal 
Hardness
6.5 
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