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Ojuela mine Rare Mineral Specimens

Tuesday, 24 April 2012 01:00 AM

The Mina Ojuela mine is Mexico's most productive mineral deposit. This Special Edition will showcase many of the secondary minerals from this famous mine.

Adamite

var. Manganoan Adamite - #PD31623
Locality
Mina Ojuela, Mapimi, Durango, Mexico 
Formula
Zn2AsO4(OH) 
Availability
Sold
Size
6.5 x 4.5 x 3 cm - Sm Cabinet 
Tagged
arsenate  

This is a good Adamite specimen if you are looking for well-defined crystals. Most of the crystals are free-standing, vertically up so as to completely enable the viewer to see the rectangular - orthorhombic cross-section and the rectangular, chisel-like terminations. The crystals are about 6mm in length.


Adamite

Formula
Zn2AsO4(OH) 
Crystal System
Orthorhombic 
Crystal Habit
Tabular, Druse, Encrustations 
Cleavage
One Good 
Luster
Vitreous - Resinous 
Color
yellow, green, violet, pink, yellowish green 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle 
Hardness
3.5 
Collection
Phillips Collection
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Adamite

(cobaltoan) - #PD31619
Locality
Mina Ojuela, Mapimi, Durango, Mexico 
Formula
Zn2AsO4(OH) 
Availability
Sold
Size
6 x 6 x 4 cm - Sm Cabinet 
Tagged
arsenate  

Light purple crystals to 1cm in large vug lined with Goethite.


Adamite

Formula
Zn2AsO4(OH) 
Crystal System
Orthorhombic 
Crystal Habit
Tabular, Druse, Encrustations 
Cleavage
One Good 
Luster
Vitreous - Resinous 
Color
yellow, green, violet, pink, yellowish green 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle 
Hardness
3.5 
Collection
Phillips Collection
Mineralpedia
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Anglesite

#PD31624
Locality
Mina Ojuela, Mapimi, Durango, Mexico 
Formula
PbSO4 
Availability
Sold
Size
5 x 4 x 3.5 cm - Miniature 

Anglesite crystals such as these from Mapimi are rare. These crystals reach 1.8cm. Each crystal is somewhat crude. The Ojuela mentioned in the MR Mexico issue reach 5cm. Comes with a Bideaux Minerals label.


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
Phillips Collection
Mineralpedia
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Aurichalcite

with Calcite - #PD31629
Locality
Mina Ojuela, Mapimi, Durango, Mexico 
Formula
Zn5(CO3)2(OH)6 
Availability
Sold
Size
7 x 4.5 x 3 cm - Sm Cabinet 
Tagged
carbonate  

Light aqua-blue compact crystals of Aurichalcite with miner blue Smithsonite.


Aurichalcite

Formula
Zn5(CO3)2(OH)6 
Crystal System
Monoclinic 
Crystal Habit
Druse, Encrustations, Acicular 
Cleavage
Perfect, None, None 
Luster
Pearly 
Color
pale green, sky blue, greenish blue 
Streak
light blue 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
Collection
Phillips Collection

Austinite

(cuprian) on Limonite - #PD31622
Locality
Mina Ojuela, Mapimi, Durango, Mexico 
Formula
CaZnAsO4(OH) 
Availability
Sold
Size
8.5 x 7 x 6 cm - Sm Cabinet 
Tagged
arsenate  

Larger specimen with coating of cuprian Austinite. This specimen may require anaylsis as distinguishing Conichalce from Austinite is difficult visually on this scale. Although, near the outer edges of the specimen the morphology of the light green, glassy crystals to 1mm are cuprian Austinite. These crystals are slender and prismatic with sharp, pointed terminations. This area phases into the sugary, darker green area and may phase into Conichalcite.


Austinite

Formula
CaZnAsO4(OH) 
Crystal System
Orthorhombic 
Cleavage
Good, None, None 
Luster
Subadamantine 
Color
brown, colorless, green, yellowish white, white 
Streak
white 
Class
Orthorhombic - Disphenoidal 
Fracture
Brittle - Uneven 
Hardness
4-4.5 
Collection
Phillips Collection
Mineralpedia
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Baryte

#PD31628
Locality
Mina Ojuela, Mapimi, Durango, Mexico 
Formula
BaSO4 
Availability
Sold
Size
6 x 5 x 3 cm - Sm Cabinet 

Light blue, thin, tabular crystals to 7mm on limonitic matriix.


Baryte

Formula
BaSO4 
Crystal System
Orthorhombic 
Crystal Habit
Tabular, Prismatic, Massive - Fibrous 
Cleavage
Perfect, Perfect, Imperfect 
Luster
Vitreous (Glassy) 
Color
white, yellowish white, grayish white, brownish white, dark brown 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Uneven 
Hardness
3-3.5 
Collection
Phillips Collection
Mineralpedia
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Mindat
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