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Mixed Minerals

Sunday, 30 May 2021 07:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including cerussite, eudialyte, malachite, and sphalerite and more from places like Tsumeb mine, Tsumeb, Namibia, Kvanefjeld Mt., Ilimaussaq complex, Narsaq, Kitaa prov., Greenland, Luishia mine, Katanga, Democratic Republic of Congo , and Madan dist, Rhodope Mts, Smolyan Oblast, Bulgaria.

Cerussite

#55843
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
PbCO3 
Availability
Available
Price
$35.00
Size
4.5 x 3.5 x 3 cm - Miniature 
Tagged
carbonate  

Colorless, striated crystals from 2 to 8mm throughout specimen.


Cerussite

Formula
PbCO3 
Crystal System
Orthorhombic 
Crystal Habit
Reticulate, Massive - Granular, Crystalline - Coarse 
Cleavage
Distinct, Distinct, None 
Luster
Adamantine 
Color
colorless, white, gray, blue, green 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
3-3.5 
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Previously Sold Cerussite
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Eudialyte

#PD55881
Locality
Kvanefjeld Mt., Ilimaussaq complex, Narsaq, Kitaa prov., Greenland 
Formula
Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2 
Availability
Available
Price
$25.00
Size
4.5 x 3 x 1.5 cm - Miniature 

Raspberry red crystalline mass.


Eudialyte

Formula
Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2 
Crystal System
Trigonal 
Crystal Habit
Massive - Granular, Tabular 
Cleavage
Imperfect, None, None 
Luster
Vitreous (Glassy) 
Color
pinkish red, red, yellow, yellowish brown, violet 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Uneven 
Hardness
5-5.5 
Mineralpedia
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Previously Sold Eudialyte
On Dakota Matrix
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Malachite

#WR55846
Locality
Luishia mine, Katanga, Democratic Republic of Congo  
Formula
Cu2CO3(OH)2 
Availability
Available
Price
$40.00
Size
8.5 x 6 x 4.5 cm - Sm Cabinet 
Tagged
carbonate , copper  

A chunk of banded Malachite.


Malachite

Formula
Cu2CO3(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Botryoidal, Stalactitic, Massive - Fibrous 
Cleavage
Perfect, Fair, None 
Luster
Vitreous - Silky 
Color
green, dark green, blackish green 
Streak
light green 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
3.5-4 
Collection
Willard L. Roberts Collection
Mineralpedia
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Sphalerite

with Galena - #AH55834
Locality
Madan dist, Rhodope Mts, Smolyan Oblast, Bulgaria 
Formula
ZnS 
Availability
Available
Price
$50.00
Size
9 x 9 x 3 cm - Sm Cabinet 
Tagged
sulfide  

Black slendent Sphalerite and equally shiny Galena. The Galena and the Sphalerite reflects the light equally and because of this the two minerals are hard to distinguish. But fret not, the Galena has smooth mirror-like faces which, on some crystals, display a skeletal, inward growth. The Sphalerite is actually black on the surface but are deep red internally (use a scope) with striations. 


Sphalerite

Formula
ZnS 
Crystal System
Isometric 
Crystal Habit
Euhedral Crystals, Granular, Colloform 
Cleavage
Perfect, Perfect, Perfect 
Luster
Resinous - Greasy 
Color
brown, yellow, red, green, black 
Streak
brownish white 
Class
Isometric - Hextetrahedral 
Fracture
Uneven 
Hardness
3.5-4 
Collection
Arnold G Hampson Collection

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