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Mixed Minerals

Sunday, 21 February 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, amphibole, anglesite, arsenopyrite, azurite, and chrysoberyl and more from places like San Juan de Rayas mine, Guanajuato, Mexico, Calumet Iron mine, Chaffee Co., Colorado, United States, Broken Hill, New South Wales, Australia, Tajo mine, Hidalgo del Parral, Chihuahua, Mexico, Morenci mine, Greenlee Co., Arizona, United States, and Novello mine, Fort Victoria, Masvingo dist., Zimbabwe.

Acanthite

#BN51680
Locality
San Juan de Rayas mine, Guanajuato, Mexico 
Formula
Ag2
Availability
Sold
Size
3 x 1 x 1 cm - Thumbnail 
Tagged
sulfide , silver  

A nicely hoppered or skeletal Acanthite group with cubic crystals to 5mm.


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
View Acanthite
On Dakota Matrix
Previously Sold Acanthite
On Dakota Matrix
Other Available Acanthite
WebMineral
View Acanthite
Mindat
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Amphibole

var. uralite - #55183
Locality
Calumet Iron mine, Chaffee Co., Colorado, United States 
Formula
AX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O) 2 
Availability
Sold
Size
12 x 8 x 10 cm - Cabinet 

Whopping well-formed crystals of so-called "uralite" to 1.3cm.


Amphibole

Collection
Dr. David Hess Collection
Mineralpedia
View Amphibole
On Dakota Matrix
Previously Sold Amphibole
On Dakota Matrix
Other Available Amphibole
WebMineral
View Amphibole
Mindat
View Amphibole

Anglesite

#WR55191
Locality
Broken Hill, New South Wales, Australia 
Formula
PbSO4 
Availability
Sold
Size
10 x 8 x 5 cm - Cabinet 

Homely-looking specimen but upon closer examination it is loaded with 1-3mm Anglesite crystals. Good Anglesite crystals are always hard to find on the market. It is a relatively common species, which rarely forms large colorful crystals.


Anglesite

Formula
PbSO4 
Crystal System
Orthorhombic 
Crystal Habit
Granular, Stalactitic 
Cleavage
Good, Distinct, None 
Luster
Adamantine 
Color
blue, colorless, green, gray, yellow 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
2.5-3 
Collection
Willard L. Roberts Collection
Mineralpedia
View Anglesite
On Dakota Matrix
Previously Sold Anglesite
On Dakota Matrix
Other Available Anglesite
WebMineral
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Mindat
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Arsenopyrite

with Quartz - #WR55184
Locality
Tajo mine, Hidalgo del Parral, Chihuahua, Mexico 
Formula
FeAsS 
Availability
Sold
Size
11.5 x 6 x 6 cm - Cabinet 
Tagged
sulfide  

Impressive cabinet size specimen with sharp Arsenopyrite crystals to 2cm associated with several Quartz crystals.


Arsenopyrite

Formula
FeAsS 
Crystal System
Monoclinic 
Crystal Habit
Striated, Euhedral Crystals, Prismatic 
Cleavage
one distinct 
Luster
Metallic 
Color
tin white, light steel gray 
Streak
black 
Geological Setting
Widespread. Most commonly found in medium to high temperature veins.  
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
5.5 to 6 
Collection
Willard L. Roberts Collection

Azurite

with Chalcoalumite - #WR55192
Locality
Morenci mine, Greenlee Co., Arizona, United States 
Formula
Cu3(CO3)2(OH)2 
Availability
Sold
Size
7 x 5.5 x 6 cm - Sm Cabinet 
Tagged
carbonate , copper  

Dark blue Azurite crystals to 7mm nestled in faint blue chalky Chalcoalumite.


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
Willard L. Roberts Collection
Mineralpedia
View Azurite
On Dakota Matrix
Previously Sold Azurite
On Dakota Matrix
Other Available Azurite
WebMineral
View Azurite
Mindat
View Azurite

Chrysoberyl

var. alexandrite - #46436
Locality
Novello mine, Fort Victoria, Masvingo dist., Zimbabwe 
Formula
BeAl2O4 
Availability
Sold
Size
2 x 2 x 1.5 cm - Thumbnail 
Tagged
beryllium  

The specimen is actually green with some crude crystal faces. This is the variety of Chrysoberyl called alexandrite, which is color changing depending on the lights used. It is green with sun and appears purple with incandescent and halogen lights as these photos show.


Chrysoberyl

Formula
BeAl2O4 
Crystal System
Orthorhombic 
Crystal Habit
Twinning Common, Prismatic, Tabular 
Cleavage
Distinct, Imperfect, Imperfect 
Luster
Vitreous (Glassy) 
Color
blue green, brown, brownish green, green, gray 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle 
Hardness
8.5 

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