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Mixed Minerals

Sunday, 14 November 2021 06:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including acanthite, anhydrite, azurite, and bayldonite and more from places like Mun. de Sombrerete, Zacatecas, Mexico, Batopilas, Chihuahua, Mexico, Guanajuato, Guanajuato, Mexico, El Teniente, Rancagua, Cachapoal, Chile, Touissit dist., Oujda-Angad prov., Oriental, Morocco, and San Rafael mine, Nye Co., Nevada, United States.

Acanthite

with Pyrite - #BN51683
Locality
Mun. de Sombrerete, Zacatecas, Mexico 
Formula
Ag2
Availability
Sold
Size
7 x 5 x 4 cm - Sm Cabinet 
Tagged
sulfide , silver  

4mm Acanthite crystals in a pocket lined with excellent Pyrite crystals. 


Acanthite

Formula
Ag2
Crystal System
Monoclinic 
Crystal Habit
Blocky, Skeletal, Arborescent 
Cleavage
poor to none 
Luster
Metallic 
Color
lead gray, gray, iron black 
Streak
shining black 
Class
Monoclinic - Prismatic 
Fracture
Sectile 
Hardness
2-2.5 
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Acanthite

with Silver - #BN56931
Locality
Batopilas, Chihuahua, Mexico 
Formula
Ag2
Availability
Sold
Size
7.5 x 6 x 4 cm - Sm Cabinet 
Tagged
sulfides , silver  

An old-timer of Acanthite with Silver. The Acanthite measures 7mm. The Silver is all over the specimen, but the best are two wires to 1-2mm around the Acanthite. Acanthite of this size are generally not seen from Batopilas.


Acanthite

Formula
Ag2
Crystal System
Monoclinic 
Crystal Habit
Blocky, Skeletal, Arborescent 
Cleavage
poor to none 
Luster
Metallic 
Color
lead gray, gray, iron black 
Streak
shining black 
Class
Monoclinic - Prismatic 
Fracture
Sectile 
Hardness
2-2.5 
Collection
Dr. Buford Nichols Collection
Mineralpedia
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Acanthite

on Chalcopyrite ps after Polybasite - #BN56939
Locality
Guanajuato, Guanajuato, Mexico 
Formula
Ag2
Availability
Sold
Size
2.5 x 2 x 2 cm - Thumbnail 
Tagged
sulfide , silver  

A fantastic specimen and classic from this locality. It is composed of tiny Chalcopyrite crystals which encrusted fairly good-sized Polybasite crystals to 5mm. You can make out the hexagonal outlines of the Polybasite. Sprinkled upon all of this are superb gray cubic Acanthite crystals to 4mm. The core as seen on the bottom is probably Pyrargyrite. It a very unique specimen. An example of one of these was featured on page 545 of Mineralogical Record v47 n5, Mexico VII.


Acanthite

Formula
Ag2
Crystal System
Monoclinic 
Crystal Habit
Blocky, Skeletal, Arborescent 
Cleavage
poor to none 
Luster
Metallic 
Color
lead gray, gray, iron black 
Streak
shining black 
Class
Monoclinic - Prismatic 
Fracture
Sectile 
Hardness
2-2.5 
Collection
Dr. Buford Nichols Collection
Mineralpedia
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Anhydrite

with Chalcopyrite & Galena - #BW56953
Locality
El Teniente, Rancagua, Cachapoal, Chile 
Formula
CaSO4 
Availability
Sold
Size
7 x 5 x 3.5 cm - Sm Cabinet 

Large cleavable plates of lilac to white Anhydrite with sulfides, namely Chalcopyrite and Galena.


Anhydrite

Formula
CaSO4 
Crystal System
Orthorhombic 
Crystal Habit
Massive - Granular, Massive - Fibrous, Plumose 
Cleavage
Perfect, Perfect, Good 
Luster
Vitreous - Pearly 
Color
colorless, white, bluish white, violet white, dark gray 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
3.5 
Collection
Bill Wilson Collection
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Azurite

#AH56907
Locality
Touissit dist., Oujda-Angad prov., Oriental, Morocco 
Formula
Cu3(CO3)2(OH)2 
Availability
Sold
Size
2.5 x 2 x 1.5 cm - Thumbnail 
Tagged
carbonate , copper  

Thumbnail specimen with thick bladed Azurite crystals to 8mm. As you can see, the lower portions of the specimen was altering to Malachite.


Azurite

Formula
Cu3(CO3)2(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Tabular, Prismatic, Stalactitic 
Cleavage
Perfect, Fair, None 
Luster
Vitreous (Glassy) 
Color
azure blue, blue, light blue, dark blue 
Streak
light blue 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
3.5-4 
Collection
Arnold G Hampson Collection
Mineralpedia
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Bayldonite

with Segnitite & Mimetite - #56908
Locality
San Rafael mine, Nye Co., Nevada, United States 
Formula
Cu3PbO(AsO3OH)2(OH)2 
Availability
Sold
Size
11 x 8 x 7 cm - Cabinet 
Tagged
arsenate , copper  

A large specimen with large vugs filled with excellent micro crystals of Bayldonite, Mimetite, and some Segnitite (last photo). A good study piece with a low price.


Bayldonite

Formula
Cu3PbO(AsO3OH)2(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Encrustations, Mammillary, Druse 
Cleavage
None, None, None 
Luster
Greasy (Oily) 
Color
grass green, yellow green, dark green 
Streak
green 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
4.5 

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