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Mixed Minerals

Friday, 06 December 2019 06:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including aurichalcite, calcite, chalcosiderite, cinnabar, coquimbite, and galena and more from places like Flux mine, Patagonia, Santa Cruz Co., Arizona, United States, Pachapaqui dist, Bolognesi prov., Ancash dept., Peru, Gunheath China Clay Pit, St. Austell, Cornwall, England, Yunchangping mine, Dadongla Hg-Zn ore field, Tongren, Guizhou, China, Dexter No. 7 mine, San Rafael dist., Emery Co., Utah, United States, and Picher, Tri-State Dist., Oklahoma, United States.

Aurichalcite

#AH51939
Locality
Flux mine, Patagonia, Santa Cruz Co., Arizona, United States 
Formula
Zn5(CO3)2(OH)6 
Availability
Sold
Size
7 x 5 x 2.5 cm - Sm Cabinet 
Tagged
carbonate  

Collected by Hampson in 1968, this specimen is a good example and seldomly seen Aurichalcite from this mine known for jack-straw Cerussite. It's a good, rich specimen with groups of Aurichalcite to 4mm across.


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
Arnold G Hampson Collection

Calcite

#AH51904
Locality
Pachapaqui dist, Bolognesi prov., Ancash dept., Peru 
Formula
CaCO3 
Availability
Sold
Size
6.5 x 5 x 3.5 cm - Sm Cabinet 
Tagged
carbonate  

Rhombic Calcite crystals from 5-8mm. Not a bad specimen for Calcite. These rhombs are prestine, sharp, and distinct. The matrix is Galena and perhaps Sphalerite. Several waterclear crystals of Quartz can be seen in-between the Calcite crystals.


Calcite

Formula
CaCO3 
Crystal System
Trigonal 
Crystal Habit
Crystalline - Coarse, Stalactitic, Massive 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous (Glassy) 
Color
colorless, white, pink, yellow, brown 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Conchoidal 
Hardness
Collection
Arnold G Hampson Collection
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Chalcosiderite

with Dufrenite & Cyrilovite - #BN51883
Locality
Gunheath China Clay Pit, St. Austell, Cornwall, England 
Formula
Cu2+Fe3+6(PO4)4(OH)8·4H2
Availability
Sold
Size
3 x 1.5 x 0.4 cm - Thumbnail 
Tagged
phosphate , copper  

A colorful specimen with dark green balls of Dufrenite and apple green crystal groups of Chalcosiderite. The yellow is Cyrilovite.


Chalcosiderite

Formula
Cu2+Fe3+6(PO4)4(OH)8·4H2
Crystal System
Triclinic 
Crystal Habit
Encrustations 
Cleavage
Perfect, Good, None 
Luster
Vitreous (Glassy) 
Color
apple green, dark green 
Streak
white 
Class
Triclinic - Pinacoidal 
Hardness
4.5 
Collection
Dr. Buford Nichols Collection

Cinnabar

#AH51923
Locality
Yunchangping mine, Dadongla Hg-Zn ore field, Tongren, Guizhou, China 
Formula
HgS 
Availability
Sold
Size
4 x 2 x 2.5 cm - Miniature 
Tagged
sulfide  

A 9mm cherry red, translucent Cinnabar crystals on white Dolomite.


Cinnabar

Formula
HgS 
Crystal System
Trigonal 
Crystal Habit
Druse, Disseminated, Massive 
Cleavage
Perfect, None, None 
Luster
Adamantine 
Color
lead gray, brown, brown pink, vermilion, gray 
Streak
bright red 
Class
Trigonal - Trapezohedral 
Fracture
Brittle - Sectile 
Hardness
2-2.5 
Collection
Arnold G Hampson Collection
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Coquimbite

#AH51909
Locality
Dexter No. 7 mine, San Rafael dist., Emery Co., Utah, United States 
Formula
Fe3+2(SO4)3·9H2
Availability
Sold
Size
8 x 5 x 6.5 cm - Sm Cabinet 

Good crystals to 3mm of purple Coquimbite with other iron sulfates. 


Coquimbite

Formula
Fe3+2(SO4)3·9H2
Crystal System
Trigonal 
Crystal Habit
Massive - Granular, Platy, Prismatic 
Cleavage
Imperfect, None, None 
Luster
Vitreous (Glassy) 
Color
greenish white, bluish white, light violet, yellowish white, brownish white 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Uneven 
Hardness
Collection
Arnold G Hampson Collection

Galena

with Marcasite - #AH51905
Locality
Picher, Tri-State Dist., Oklahoma, United States 
Formula
PbS 
Availability
Sold
Size
11.5 x 6.5 x 6.5 cm - Cabinet 
Tagged
sulfide  

Large cabinet specimen with large Galena crystals to 3.5cm with abundant goldish Marcasite crystals which show good cockscomb habit. A good looking specimen acquired by Hampson in 1975.


Galena

Formula
PbS 
Crystal System
Isometric 
Crystal Habit
Euhedral Crystals, Massive - Granular, Massive 
Cleavage
Perfect, Perfect, Perfect 
Luster
Metallic 
Color
light lead gray, dark lead gray 
Streak
grayish black 
Class
Isometric - Hexoctahedral 
Fracture
Brittle 
Hardness
2.5 
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