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Mixed Minerals

Friday, 10 March 2017 08:00 AM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including ferdowsiite, gismondine-ca, lipscombite, mesolite, molybdofornacite, and nagelschmidtite and more from places like Uchucchacua mine, Oyon prov., Lima dept., Peru, near Rome, Latium, Italy, Buranga pegmatite, Gatumba dist., Western Prov., Rawanda, Benton Co., Oregon, United States, Tsumeb mine, Tsumeb, Namibia, and Hatrurim Formation, Negev, Isreal.

Ferdowsiite

#46341
Locality
Uchucchacua mine, Oyon prov., Lima dept., Peru 
Formula
Ag8(Sb5As3)S16 
Availability
Sold
Size
0.8 x 0.5 x 0.3 cm - Thumbnail 
Tagged
sulfide , silver  

Very rare, relatively new (IMA 2012), silver-antimony-arsenic-sulfide. This is the second worldwide locality. The Ferdowsiite occurs as black blocky, very shiny crystals less than 1mm. It is very hard to photo because of all the reflectivity.


Gismondine-Ca

#BN46537
Locality
near Rome, Latium, Italy 
Formula
Ca2(Si4Al4)O16·8H2
Availability
Sold
Size
8 x 5 x 3 cm - Sm Cabinet 
Tagged
zeolite  

Numerous monoclinic pseudo-octahedral colorless crystals to 3mm on this specimen with associated Phillipsite (rounded groups, nearly white).


Gismondine-Ca

Collection
Dr. Buford L. Nichols Collection

Lipscombite

with Phosphosiderite - #46535
Locality
Buranga pegmatite, Gatumba dist., Western Prov., Rawanda 
Formula
Fe2+Fe3+2(PO4)2(OH)2 
Availability
Available
Price
$30.00
Size
5.5 x 4 x 3 cm - Sm Cabinet 
Tagged
phosphate , pegmatite mineral  

This is just an altered phosphate chunk showing a few zones of minerals. The purple is  the Phosphosiderite, while the yellow is Lipscombite.


Lipscombite

Formula
Fe2+Fe3+2(PO4)2(OH)2 
Crystal System
Tetragonal 
Color
green gray, olive green, black 
Class
Tetragonal - Trapezohedral 
Hardness
Collection
Dr. Buford L. Nichols Collection

Mesolite

with Calcite - #PD46564
Locality
Benton Co., Oregon, United States 
Formula
Na2Ca2(Si9Al6)O30·8H2
Availability
Available
Price
$40.00
Size
7 x 6 x 4.5 cm - Sm Cabinet 
Tagged
zeolite  

Silky, fine needles of Mesolite covering Calcite.


Mesolite

Formula
Na2Ca2(Si9Al6)O30·8H2
Crystal System
Monoclinic 
Crystal Habit
Acicular, Capillary, Spherical 
Cleavage
Perfect, Perfect, None 
Luster
Vitreous - Silky 
Color
white, gray, pale yellow 
Streak
white 
Class
Monoclinic - Sphenoidal 
Fracture
Uneven 
Hardness
Collection
Phillips Collection
Mineralpedia
View Mesolite
On Dakota Matrix
Previously Sold Mesolite
On Dakota Matrix
Other Available Mesolite
WebMineral
View Mesolite
Mindat
View Mesolite

Molybdofornacite

#BN46533
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
CuPb2MoO4AsO4(OH) 
Availability
Sold
Size
Chip < 1cm 
Tagged
arsenate , copper  

TWO specimens here! Both are small. One is 1.5 x 0.8 x 0.7mm. The other is 1.3mm x 0.3mm (wide) x 0.8mm. Yes, they are small. But the larger has good green microcrystals and the other (narrow pc) has better crystals with other unidentifieds.


Molybdofornacite

Formula
CuPb2MoO4AsO4(OH) 
Crystal System
Monoclinic 
Crystal Habit
Pistolitic, Lath 
Cleavage
None, None, None 
Luster
Adamantine 
Color
light green 
Streak
yellow 
Class
Monoclinic - Prismatic 
Fracture
Conchoidal 
Hardness
2-3 
Collection
Dr. Buford L. Nichols Collection

Nagelschmidtite

#BN46549
Locality
Hatrurim Formation, Negev, Isreal 
Formula
Ca7(SiO4)2(PO4)2 
Availability
Available
Price
$225.00
Size
Micromount 
Tagged
phosphate  
Special Info
Type Locality 
Special Info
EDS Confirmed 

Brownish orange glassy thin section of Nagelschmidtite, a very rare phosphate. The mineral is found in the sedimentary rock of the Hatrurim Fm. The phosphate formed in a high temperture environment created by burning coal beds.This specimen is a microprobe mount and the actual specimen is a thin section of 5mm glued by epoxy onto the glass. So obviously it has been verified perhaps even a co-type, though there is no paperwork to that claim.


Nagelschmidtite

Formula
Ca7(SiO4)2(PO4)2 
Crystal System
Hexagonal 
Crystal Habit
Anhedral Grains 
Cleavage
Good, None, None 
Luster
Vitreous (Glassy) 
Color
brown, colorless, yellowish white, light yellow 
Streak
white 
Class
Hexagonal 
Hardness
Collection
Dr. Buford L. Nichols Collection
Special Info
Type Locality
Special Info
EDS Confirmed

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