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Mixed Minerals

Friday, 01 November 2019 07:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including aphrosiderite (chlorite group member), bournonite, corundum, cuprite, fluorite, and grossular and more from places like Michigamme, Marquette Co., Michigan, United States, Herodsfoot mine, Liskeard, Cornwall, England, Highlands, North Carolina, United States, Ray mine, Pinal Co., Arizona, United States, Clay Center, Ottawa Co., Ohio, United States, and Orford Nickel mine, Estrie, Quebec, Canada.

Aphrosiderite (Chlorite Group Member)

#AH51644
Locality
Michigamme, Marquette Co., Michigan, United States 
Formula
(Fe,Mg,Al)6(Si,Al)4O10(OH)8 
Availability
Available
Price
$65.00
Size
3 x 2 x 2 cm - Thumbnail 

Aphrosiderite is a replacement of Almadine garnet by chlorite. Aphrosiderite has been a discredited mineral. This is nearly a perfect crystal. 


Aphrosiderite (Chlorite Group Member)

Collection
Arnold G Hampson Collection

Bournonite

#51590
Locality
Herodsfoot mine, Liskeard, Cornwall, England 
Formula
CuPbSbS3 
Availability
Available
Price
$45.00
Size
6 x 6.5 x 4.5 cm - Sm Cabinet 
Tagged
sulfide , copper  

2-3mm twinned crystals to Bournonite in open-fracture lined with drusy Quartz. Some nice iridescence with unknown brown plates. Handsome specimen from this classic English locality know for its superb Bournonite specimens. First worked in the 1700'3 and mid 1800's.


Bournonite

Formula
CuPbSbS3 
Crystal System
Orthorhombic 
Crystal Habit
Platy, Pseudo Cubic, Cog-wheel 
Cleavage
Imperfect, None, None 
Luster
Metallic 
Color
gray, black, steel gray 
Streak
gray 
Class
Orthorhombic - Dipyramidal 
Fracture
Sub Conchoidal 
Hardness

Corundum

#AH51547
Locality
Highlands, North Carolina, United States 
Formula
Al2O3 
Availability
Available
Price
$30.00
Size
5 x 5 x 3.5 cm - Miniature 

Red crude Corundum wrapped with Muscovite. The locality I assume is the nearest town, and thus I do not know precisely the locality. It is not quite this red in hand. Acquired by Hampson in 1945. Perhaps somebody out there knows?


Corundum

Formula
Al2O3 
Crystal System
Trigonal 
Crystal Habit
Euhedral Crystals, Tabular, Prismatic 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
blue, red, yellow, brown, gray 
Streak
none 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Tough 
Hardness
Collection
Arnold G Hampson Collection
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Cuprite

#AH51540
Locality
Ray mine, Pinal Co., Arizona, United States 
Formula
Cu1+2
Availability
Sold
Size
11 x 8 x 4 cm - Cabinet 
Tagged
copper  

Cabinet size specimen of spongy goethite or Mn-oxide matrix with great coverage of dark red Cuprite in both chalcotricite habit and modified cubic crystals to 1mm.  Circa 1984.


Cuprite

Formula
Cu1+2
Crystal System
Isometric 
Crystal Habit
Massive - Granular, Capillary 
Cleavage
Imperfect, None, None 
Luster
Adamantine 
Color
brown red, purple red, red, black 
Streak
brownish red 
Class
Isometric - Hexoctahedral 
Fracture
Brittle - Conchoidal 
Hardness
3.5-4 
Collection
Arnold G Hampson Collection
Mineralpedia
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Fluorite

#AH51623
Locality
Clay Center, Ottawa Co., Ohio, United States 
Formula
CaF2 
Availability
Sold
Size
8.5 x 4 x 5.5 cm - Sm Cabinet 

These suckers are always hard to photo for me as the lighting never the captures the true golden brown color of the Fluorite from this locality. Some have excellent iridescents, this one does not. Nonethelss, there are large nicely formed crystals to 15mm.

It was acquired by Hampson in 1945.


Fluorite

Formula
CaF2 
Crystal System
Isometric 
Crystal Habit
Crystalline - Coarse, Massive - Granular, Disseminated 
Cleavage
Three perfect, octahedral cleavages. 
Luster
Vitreous (Glassy) 
Color
purple, clear, yellow, green, red, blue 
Streak
white 
Geological Setting
Occurs in a wide range of geologic environments including low temperature Missississippi Valley lead-zinc deposits, hydrothermal gold deposits, Alpine cleft metamorphic environments  
Class
Isometric - Hexoctahedral 
Fracture
Uneven 
Hardness
Collection
Arnold G Hampson Collection
Mineralpedia
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Grossular

(chromian) - #AH51610
Locality
Orford Nickel mine, Estrie, Quebec, Canada 
Formula
Ca3Al2(SiO4)3 
Availability
Available
Price
$40.00
Size
5.5 x 4 x 3 cm - Sm Cabinet 

Micro crystals of green Grossular, chromium rich. There are no real good crystals, but some faces can be seen under the scope.


Grossular

Collection
Arnold G Hampson Collection

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