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Mixed Minerals

Friday, 17 March 2017 07:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including eurekadumpite, herderite, parsonsite, petzite, polybasite, and scholzite and more from places like Centennial Eureka mine, Tintic dist., Juab Co., Utah, United States, Golconda pegmatite, Governador Valadares, Doce valley, Minas Gerais, Brazil, Lachaux, Puy-de-Dôme, Auvergne, France, Mayflower mine, Madison Co., Montana, United States, Sokolovskoe Iron mine, Kostanay prov., Kazakhstan, and Hagendorf Nord, Oberpfälzer Wald, Bavaria, Germany.

Eurekadumpite

with Mcalpineite - #46608
Locality
Centennial Eureka mine, Tintic dist., Juab Co., Utah, United States 
Formula
(Cu,Zn)16(TeO3)2(AsO4)3Cl(OH)18·7H2
Availability
Sold
Size
3.5 x 3 x 2 cm - Miniature 
Tagged
arsenate , copper , tellurium  
Special Info
Type Locality 

Blue sprays of Eurekadumpite (might be Utahite) to 1mm sparse on matrix with much more bright green Mcalpineite. There is a little yellowish green ball, which is unidentified. The large patch of green is Malachite, I think!


Eurekadumpite

Formula
(Cu,Zn)16(TeO3)2(AsO4)3Cl(OH)18·7H2
Special Info
Type Locality

Herderite

on Microcline - #BN46619
Locality
Golconda pegmatite, Governador Valadares, Doce valley, Minas Gerais, Brazil 
Formula
CaBePO4
Availability
Available
Price
$125.00
Size
11 x 6 x 6 cm - Cabinet 
Tagged
phosphate , beryllium , pegmatite mineral  

The specimen was acquired by Nichols in 1976. It is a large specimen of mostly white to light pink Microcline with yellow brown large crystals of Herderite to over 1.5cm. The Microcline appears to have been etched and brecciated by remaining fluid of the pegmatite or later hydrothermal fluids which have deposited the Herderite. Most of the Herderite are twinned. As Mindat notes, most Herderites may be Hydroxylherderite, not much of a difference however.


Herderite

Formula
CaBePO4
Crystal System
Monoclinic 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
white, yellowish white, greenish white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Sub Conchoidal 
Hardness
Collection
Dr. Buford L. Nichols Collection
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Parsonsite

#BN46604
Locality
Lachaux, Puy-de-Dôme, Auvergne, France 
Formula
Pb2(UO2)(PO4)2·0-2H2
Availability
Available
Price
$40.00
Size
4.5 x 4 x 3 cm - Miniature 
Tagged
phosphate  

Light yellow tiny, less than 1mm, acicular crystals. Sparse.


Parsonsite

Formula
Pb2(UO2)(PO4)2·0-2H2
Crystal System
Triclinic 
Crystal Habit
Microscopic Crystals, Platy, Pseudo Hexagonal 
Cleavage
Indistinct, None, None 
Luster
Subadamantine 
Color
brown, greenish brown, yellow, yellow brown, light yellow 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Conchoidal 
Hardness
2.5-3 
Collection
Dr. Buford L. Nichols Collection

Petzite

#46596
Locality
Mayflower mine, Madison Co., Montana, United States 
Formula
Ag3AuTe2 
Availability
Sold
Size
2.5 x 1.5 x 1.5 cm - Thumbnail 
Tagged
tellurium , silver , gold  

Silvery blackish metallic crystal grains throughout matrix. A desirable, historic locality.


Petzite

Formula
Ag3AuTe2 
Crystal System
Isometric 
Crystal Habit
Massive, Granular 
Cleavage
None, None, None 
Luster
Metallic 
Color
iron black, steel gray 
Streak
grayish black 
Class
Isometric - Gyroidal 
Fracture
Brittle - Sectile 
Hardness
2.5 
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Polybasite

#46594
Locality
Sokolovskoe Iron mine, Kostanay prov., Kazakhstan 
Formula
Cu(Ag,Cu)6Ag9Sb2S11 
Availability
Sold
Size
5.5 x 4 x 3 cm - Sm Cabinet 
Tagged
sulfide , copper , silver  

There are two 3mm Polybasite crystals on this specimen with dozens of much smaller all over matrix.


Polybasite

Formula
Cu(Ag,Cu)6Ag9Sb2S11 
Crystal System
Monoclinic 
Crystal Habit
Massive - Granular, Granular, Pseudo Hexagonal 
Cleavage
Poor, None, None 
Luster
Sub Metallic 
Color
black, dark ruby red 
Streak
reddish black 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
2.5-3 

Scholzite

with Phosphophyllite - #BN46623
Locality
Hagendorf Nord, Oberpfälzer Wald, Bavaria, Germany 
Formula
CaZn2(PO4)2·2H2
Availability
Available
Price
$195.00
Size
8.5 x 6 x 4.5 cm - Sm Cabinet 
Tagged
phosphate , pegmatite mineral  

White to bluish stubby crystals of Scholzite to 2mm tucked in a vug with light green Phosphophyllite to 3mm.


Scholzite

Formula
CaZn2(PO4)2·2H2
Crystal System
Orthorhombic 
Cleavage
Parting, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, gray white, white 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle 
Hardness
Collection
Dr. Buford L. Nichols Collection
Mineralpedia
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