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Mixed Minerals

Sunday, 23 August 2020 07:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including carnotite, cassiterite, eosphorite, and mimetite and more from places like Monument #2 mine, Apache Co., Arizona, United States, Great Wheal Fortune, Breage, Cornwall, England, Poldory Sett, United Downs, St. Day, Cornwall, England, Taquaral, Itinga, Minas Gerais, Brazil, and San Pedro Corralitos, Chihuahua, Mexico.

Carnotite

#AH53960
Locality
Monument #2 mine, Apache Co., Arizona, United States 
Formula
K2(UO2)2(VO4)2·3H2
Availability
Sold
Size
7.5 x 5.5 x 4 cm - Sm Cabinet 
Tagged
vanadium  

Yellow, powdery Carnotite replacing petrified wood.


Carnotite

Formula
K2(UO2)2(VO4)2·3H2
Crystal System
Monoclinic 
Crystal Habit
Earthy, Encrustations, Platy 
Cleavage
Perfect, None, None 
Luster
Pearly 
Color
yellow, golden yellow, greenish yellow 
Streak
light yellow 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
Collection
Arnold G Hampson Collection

Cassiterite

#52431
Locality
Great Wheal Fortune, Breage, Cornwall, England 
Formula
SnO2 
Availability
Available
Price
$45.00
Size
8 x 5 x 4 cm - Sm Cabinet 
Tagged
tin  

Excellent chocolate brown well-formed crystals to 2mm in a Quartz vein on phyllite matrix.


Cassiterite

Formula
SnO2 
Crystal System
Tetragonal 
Crystal Habit
Prismatic, Massive, Botryoidal 
Cleavage
Perfect, Indistinct, None 
Luster
Adamantine 
Color
brown, brownish black, colorless, green, gray 
Streak
brownish white 
Class
Tetragonal - Ditetragonal Dipyramidal 
Fracture
Irregular 
Hardness
6-7 

Cassiterite

#52446
Locality
Poldory Sett, United Downs, St. Day, Cornwall, England 
Formula
SnO2 
Availability
Available
Price
$40.00
Size
5.5 x 4 x 3.0 cm - Sm Cabinet 
Tagged
tin  

Several 1 to 1.5mm euhedral brown crystals of Cassiterite on matrix.


Cassiterite

Formula
SnO2 
Crystal System
Tetragonal 
Crystal Habit
Prismatic, Massive, Botryoidal 
Cleavage
Perfect, Indistinct, None 
Luster
Adamantine 
Color
brown, brownish black, colorless, green, gray 
Streak
brownish white 
Class
Tetragonal - Ditetragonal Dipyramidal 
Fracture
Irregular 
Hardness
6-7 

Eosphorite

on Quartz - #AH53584
Locality
Taquaral, Itinga, Minas Gerais, Brazil 
Formula
Mn2+AlPO4(OH)2·H2
Availability
Available
Price
$55.00
Size
8 x 5 x 4 cm - Sm Cabinet 
Tagged
phosphate  

This is a very interesting specimen, mineralogically. All of the spongy mass has a goldish iridescence. I believe these to be Siderite or Calcite, which are elongated scalenohedral crysals grown in parallel. The bulk of the specimen is a large smoky Quartz crystal upon which neat little 1-4mm clusters of Eosphorite are grown.


Eosphorite

Formula
Mn2+AlPO4(OH)2·H2
Crystal System
Orthorhombic 
Crystal Habit
Massive - Fibrous, Prismatic, Striated 
Cleavage
Indistinct, None, None 
Luster
Vitreous - Resinous 
Color
light pink, yellow brown, light brown, light yellow, colorless 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Conchoidal - Uneven 
Hardness
Collection
Arnold G Hampson Collection

Mimetite

#WR53945
Locality
San Pedro Corralitos, Chihuahua, Mexico 
Formula
Pb5(AsO4)3Cl 
Availability
Available
Price
$495.00
Size
11 x 7 x 4.5 cm - Cabinet 
Tagged
arsenate  

Yellow spheroidal crystals of Mimetite to 6mm across matrix. Like Mimetite from the Dry Gill mine, this locality has produced some of the world's best Mimetite. This specimen is no exception with great color and the abundance ot beautiful crystal groups. These guys are getting very hard to find.


Mimetite

Formula
Pb5(AsO4)3Cl 
Crystal System
Hexagonal 
Crystal Habit
Reniform, Globular, Prismatic 
Cleavage
Imperfect, None, None 
Luster
Adamantine - Resinous 
Color
white, yellow, orange, brown, red 
Streak
white 
Class
Hexagonal - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
3.5-4 
Collection
Willard L. Roberts Collection
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