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Mixed Minerals

Sunday, 12 July 2020 05:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including marcasite, minrecordite, schaurteite, tennantite, thaumasite, and thometzekite and more from places like Picher mine, Ottawa Co., Oklahoma, United States, Tsumeb mine, Tsumeb, Namibia, Commercial quarry, Crestmore, Riverside Co., California, United States.

Marcasite

on Galena - #AH53735
Locality
Picher mine, Ottawa Co., Oklahoma, United States 
Formula
FeS2 
Availability
Available
Price
$85.00
Size
13 x 8 x 7 cm - Cabinet 
Tagged
sulfide  

Classic, brassy, cockscomb habit Marcasite crystals to 2.5cm with etched out Galena cubes. 


Marcasite

Formula
FeS2 
Crystal System
Orthorhombic 
Crystal Habit
Tabular, Stalactitic, Globular 
Cleavage
Indistinct, None, None 
Luster
Metallic 
Color
bronze, light brass yellow, tin white 
Streak
gray brownish black 
Class
Orthorhombic - Dipyramidal 
Fracture
Uneven 
Hardness
6-6.5 
Collection
Arnold G Hampson Collection
Mineralpedia
View Marcasite
On Dakota Matrix
Previously Sold Marcasite
On Dakota Matrix
Other Available Marcasite
WebMineral
View Marcasite
Mindat
View Marcasite

Minrecordite

with Dioptase & Duftite - #PD53710
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
CaZn(CO3)2 
Availability
Sold
Size
2.5 x 1.5 x 1.5 cm - Thumbnail 
Tagged
carbonate  
Special Info
Type Locality 

Colorless to white, pearly rhombic crystals to about 0.75mm scatered as single and groups between emerald green Dioptase (stunning) and bright lime green Duftite (?).


Minrecordite

Formula
CaZn(CO3)2 
Crystal System
Trigonal 
Cleavage
Perfect, None, None 
Luster
Pearly 
Color
colorless, white 
Streak
white 
Class
Trigonal - Rhombohedral 
Hardness
3.5-4 
Collection
Don Phillips Collection
Special Info
Type Locality
SOLD
Schaurteite - 38750
Schaurteite - 38750

Schaurteite

#38750
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
Ca3Ge4+(SO4)2(OH)6·3H2
Availability
Sold
Size
0.9 x 0.7 x 0.4 cm - Thumbnail 
Special Info
Type Locality 

White mass of randon acicular crystals. Very rare.


Schaurteite

Formula
Ca3Ge4+(SO4)2(OH)6·3H2
Crystal System
Hexagonal 
Crystal Habit
Acicular, Fibrous 
Luster
Silky 
Color
silky white 
Streak
white 
Class
Hexagonal - Ditrigonal Dipyramidal 
Hardness
2.5 
Special Info
Type Locality

Tennantite

ps Schultenite with Mimetite - #PD53709
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
Cu12As4S13 
Availability
Sold
Size
2.5 x 2 x 1.5 cm - Thumbnail 
Tagged
sulfide , copper  

Thick blades of Tennanite, which replaced Schultenite to 5mm with excellent, light yellow and gemmy Mimetite crystals. There is more on this specimen which may include Serpierite and other minerals.


Tennantite

Formula
Cu12As4S13 
Crystal System
Isometric 
Crystal Habit
Massive - Granular, Massive, Disseminated 
Cleavage
None, None, None 
Luster
Metallic 
Color
steel gray, black 
Streak
reddish gray 
Class
Isometric - Hextetrahedral 
Fracture
Hackly 
Hardness
3.5-4 
Collection
Don Phillips Collection

Thaumasite

#53716
Locality
Commercial quarry, Crestmore, Riverside Co., California, United States 
Formula
Ca3Si(OH)6(SO4)(CO3)·12H2
Availability
Sold
Size
4.5 x 3 x 2 cm - Miniature 

Very good, waterclear hexagonal prisms less than 1mm in size with good coverage. The crystals are hard to see in the photo, but under a scope you will see them clearly.


Thaumasite

Formula
Ca3Si(OH)6(SO4)(CO3)·12H2
Crystal System
Hexagonal 
Crystal Habit
Radial, Massive - Fibrous, Fibrous 
Cleavage
Poor, None, None 
Luster
Vitreous - Silky 
Color
colorless, white 
Streak
white 
Class
Hexagonal - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
3.5 
Collection
Fred DeVito Collection
SOLD
Thometzekite - 53712
Thometzekite - 53712

Thometzekite

#53712
Locality
Tsumeb mine, Tsumeb, Namibia 
Formula
PbCu2+2(AsO4)2·2H2
Availability
Sold
Size
0.7 x 0.7 x 0.2 cm - Thumbnail 
Tagged
arsenate , copper  
Special Info
Type Locality 

Milky greenish blue, feathery micro crystals associated with Adamite(?). Rich. From Georg Gebhard with tag. 2nd Oxidation zone. 


Thometzekite

Formula
PbCu2+2(AsO4)2·2H2
Crystal System
Monoclinic 
Luster
Earthy (Dull) 
Color
bluish green, green 
Streak
white 
Class
Monoclinic - Prismatic 
Hardness
4-5 
Special Info
Type Locality

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