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Mexican Minerals

Tuesday, 24 March 2020 12:00 PM

Introducing the "Mexican Minerals" gallery which is part of our Special Edition galleries. This gallery contains mineral specimens for sale including natanite, polybasite, pyrargyrite, pyrrhotite, and quartz and more from places like 10th level, Potosi mine, Santa Eulalia, Chihuahua, Mexico, Veta Grande mine, Vetagrande, Zacatecas, Mexico, San Juan de Rayas mine, Guanajuato, Mexico, and Los Arcoiris, Ojo Laguna, Chihuahua, Mexico.

Natanite

on Ilvaite - #51537
Locality
10th level, Potosi mine, Santa Eulalia, Chihuahua, Mexico 
Formula
Fe2+Sn4+(OH)6 
Availability
Available
Price
$75.00
Size
4.5 x 1.5 x 3 cm - Miniature 
Tagged
tin  

Bright blue octahedral crystal to 1mm in black Ilvaite. Natanite is a rare tin mineral found at very few localities worldwide.


Natanite

Formula
Fe2+Sn4+(OH)6 
Crystal System
Isometric 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
greenish brown 
Class
Isometric - Hexoctahedral 
Hardness
Mineralpedia
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Polybasite

with Acanthite on Quartz - #BN51684
Locality
Veta Grande mine, Vetagrande, Zacatecas, Mexico 
Formula
Cu(Ag,Cu)6Ag9Sb2S11 
Availability
Sold
Size
6 x 5 x 3.5 cm - Sm Cabinet 
Tagged
sulfide , copper , silver  

Hexagonal, silvery, Polybasite crystals to 6mm with associated Acanthite crystals. Some minor Chalcopyrite.


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 
Collection
Dr. Buford Nichols Collection

Polybasite

#BN51688
Locality
San Juan de Rayas mine, Guanajuato, Mexico 
Formula
Cu(Ag,Cu)6Ag9Sb2S11 
Availability
Available
Price
$65.00
Size
1.4 x 1.4 x 0.7 cm - Thumbnail 
Tagged
sulfide , copper , silver  

Small plates of striated Polybasite showing nice striations.


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 
Collection
Dr. Buford Nichols Collection

Pyrargyrite

#BN51695
Locality
San Juan de Rayas mine, Guanajuato, Mexico 
Formula
Ag3SbS3 
Availability
Available
Price
$70.00
Size
2.4 x 1.3 x 1.2 cm - Thumbnail 
Tagged
sulfide , silver  

A 2.3cm terminated Pyrargyrite crystal, nicely terminated, and showing nice red internal reflections. A ding on termination.


Pyrargyrite

Formula
Ag3SbS3 
Crystal System
Trigonal 
Crystal Habit
Massive, Crystalline - Poor, Prismatic 
Cleavage
Poor, None, None 
Luster
Sub Metallic 
Color
deep red, red gray 
Streak
cherry red 
Class
Trigonal - Ditrigonal Pyramidal 
Fracture
Brittle - Conchoidal 
Hardness
2.5 

Pyrrhotite

with Sphalerite - #AH52737
Locality
Santa Eulalia, Chihuahua, Mexico 
Formula
Fe7S8 
Availability
Sold
Size
6 x 4.5 x 5 cm - Sm Cabinet 
Tagged
sulfide  

Brassy colored barrel shaped crystals of magnetic Pyrrhotite to 8mm associated with Sphalerite and Quartz. Excellent specimen. Acquired in 1971 by Hampson.


Pyrrhotite

Formula
Fe7S8 
Crystal System
Monoclinic 
Crystal Habit
Tabular, Platy, Massive - Granular 
Cleavage
Imperfect, Imperfect, None 
Luster
Metallic 
Color
bronze, bronze red, dark brown 
Streak
gray black 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
3.5-4 
Collection
Arnold G Hampson Collection

Quartz

var. agate - #52800
Locality
Los Arcoiris, Ojo Laguna, Chihuahua, Mexico 
Formula
SiO2 
Availability
Available
Price
$85.00
Size
6.5 x 6 x 2 cm - Sm Cabinet 

Beautiful Laguna agate with white to purple bands and Quartz crystals in a vug at center. Two main photos are shown: the left photo is dry and right photo is takes with the specimen wet, which brings out the color. All of the close-ups are wet.


Quartz

Formula
SiO2 
Crystal System
Trigonal 
Crystal Habit
Crystalline - Coarse, Druse, Crystalline - Fine 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
brown, colorless, violet, gray, yellow 
Streak
white 
Class
Trigonal - Trapezohedral 
Fracture
Conchoidal 
Hardness
Mineralpedia
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