mineral specimens
rare minerals
mineral dealer
systematic minerals
Black Hills minerals
fine minerals
mineral dealer
Dana minerals
IMA minerals
mineral collections
rock and minerals
gem crystal
0 item @ $0.00  

Rare & Systematic

Friday, 08 March 2019 06:00 PM

Introducing the "Rare & Systematic" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including anglesite, ankerite, argyrodite, baryte, berryite, and bobcookite and more from places like Monteponi mine, Iglesias, Sardinia, Italy, Smallcleugh Mine, Nenthead, Alston Moor dist., Cumbria, England, Himmelsfurst mine, Freiberg dist., Saxony, Germany, Haile Moor mine, Haile, Copeland, Cumbria, England, Mike mine, San Juan Co., Colorado, United States, and Blue Lizard mine, Red Canyon, San Juan Co., Utah, United States.

Anglesite

in Galena - #50370
Locality
Monteponi mine, Iglesias, Sardinia, Italy 
Formula
PbSO4 
Availability
Sold
Size
6 x 5.5 x 3 cm - Sm Cabinet 

A large vug 3cm across with colorless prismatic crystals of Anglesite to 5mm in granular Galena. The specimen carries a Dr. F. Krantz label, see prov. tab.


Anglesite

Formula
PbSO4 
Crystal System
Orthorhombic 
Crystal Habit
Granular, Stalactitic 
Cleavage
Good, Distinct, None 
Luster
Adamantine 
Color
blue, colorless, green, gray, yellow 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
2.5-3 
Mineralpedia
View Anglesite
On Dakota Matrix
Previously Sold Anglesite
On Dakota Matrix
Other Available Anglesite
WebMineral
View Anglesite
Mindat
View Anglesite

Ankerite

on Quartz - #50402
Locality
Smallcleugh Mine, Nenthead, Alston Moor dist., Cumbria, England 
Formula
CaFe2+(CO3)2 
Availability
Sold
Size
10 x 6 x 3 cm - Cabinet 
Tagged
carbonate  

A handsome basic mineral specimen from a well-known Cumbrian locality well-known to collectors of the area. This specimen sits perfectly well on its own as seen in the first photo. The other photos show the saddle-shaped crystals with a pearly luster and curvy shapes of the Ankerite crystals generally to 4mm. 


Ankerite

Formula
CaFe2+(CO3)2 
Crystal System
Trigonal 
Crystal Habit
Crystalline - Coarse, Massive, Granular 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous (Glassy) 
Color
brown, brownish yellow, gray, gray brown, white 
Streak
white 
Class
Trigonal - Rhombohedral 
Fracture
Sub Conchoidal 
Hardness
3.5-4 
Mineralpedia
View Ankerite
On Dakota Matrix
Previously Sold Ankerite
On Dakota Matrix
Other Available Ankerite
WebMineral
View Ankerite
Mindat
View Ankerite
SOLD
Argyrodite - 50405
Argyrodite - 50405

Argyrodite

#50405
Locality
Himmelsfurst mine, Freiberg dist., Saxony, Germany 
Formula
Ag8GeS6 
Availability
Sold
Size
2 x 2 x 1 cm - Thumbnail 
Tagged
sulfide , silver  
Special Info
Type Locality 

This is an old Ward's Science specimen with an old hand-written label (see prov. tab). The specimen abounds in tiny 1mm and less Argyrodite crystals. Very rich, most of the specimen is Argyrodite.


Argyrodite

Formula
Ag8GeS6 
Crystal System
Orthorhombic 
Crystal Habit
Subhedral Crystals, Massive - Granular 
Cleavage
None, None, None 
Luster
Metallic 
Color
black, steel gray 
Streak
grayish black 
Class
Orthorhombic - Pyramidal 
Fracture
Brittle - Conchoidal 
Hardness
2.5 
Special Info
Type Locality

Baryte

on Hematite with Calcite - #50345
Locality
Haile Moor mine, Haile, Copeland, Cumbria, England 
Formula
BaSO4 
Availability
Sold
Size
13 x 6 x 5.5 cm - Cabinet 

Hematite crystals are known for their variety of habits. On this specimen the entire black area is covered with discoidal rosettes of flashy black rosettes of Hematite to 4mm. Groups of rectangular creamy white Baryte crystals to 6mm cover the parts of the Hematite in small areas. Encroaching in from the left side are brownish Calcite crystals which cover half of the backside.  It's a large specimen, fit for the cabinet to round out your sweet English suite. Two hand-written labels can be seen in the provenance tab.


Baryte

Formula
BaSO4 
Crystal System
Orthorhombic 
Crystal Habit
Tabular, Prismatic, Massive - Fibrous 
Cleavage
Perfect, Perfect, Imperfect 
Luster
Vitreous (Glassy) 
Color
white, yellowish white, grayish white, brownish white, dark brown 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Uneven 
Hardness
3-3.5 
Mineralpedia
View Baryte
On Dakota Matrix
Previously Sold Baryte
On Dakota Matrix
Other Available Baryte
WebMineral
View Baryte
Mindat
View Baryte
SOLD
Berryite - 50442
Berryite - 50442

Berryite

with Pavonite - #50442
Locality
Mike mine, San Juan Co., Colorado, United States 
Formula
Cu3Ag2Pb3Bi7S16 
Availability
Sold
Size
2 x 2 x 0.4 cm - Thumbnail 
Tagged
sulfide , copper , silver  
Special Info
Microprobed 

This is a cut and microprobed specimen from the stock of Dr. Jaroslv Hyrsl. The Berryite can be seen as the black, slender blades. The Pavonite crystals are also the blakes blades so they cannot be distinguished visually. Aikinite is also present which further complicates the issue. Both Berryite and Pavonite are rare silver-bismuth sulfides.


Berryite

Formula
Cu3Ag2Pb3Bi7S16 
Crystal System
Monoclinic 
Cleavage
Indistinct, None, None 
Luster
Metallic 
Color
blue gray, gray 
Class
Monoclinic - Prismatic 
Hardness
3.5 
Special Info
Microprobed
On Dakota Matrix
Previously Sold Berryite
On Dakota Matrix
Other Available Berryite
WebMineral
View Berryite
Mindat
View Berryite

Bobcookite

with Pickeringite - #50406
Locality
Blue Lizard mine, Red Canyon, San Juan Co., Utah, United States 
Formula
NaAl(UO2)2(SO4)4ยท18H2
Availability
Sold
Size
2 x 1.5 x 1 cm - Thumbnail 
Special Info
Fluorescent 
Special Info
Type Locality 
Special Info
XRD Confirmed 
Special Info
EDS Confirmed 

Bobcookite is a relatively new IMA mineral named after my good friend Dr. Bob Cook. It is easily observed as it is highly flourescent green and occurs as yellowish green glassy crystals with white silky Pickeringite. This is the fourth occurence, but all are in the same district. It is not found anywhere else.


Special Info
Fluorescent
Special Info
Type Locality
Special Info
XRD Confirmed
Special Info
EDS Confirmed

All photos by Dakota Matrix and are Copyrighted © and may not be used without permission. Copyright © 2019 - Dakota Matrix Minerals, Inc. Privacy | Terms & Conditions | Site Map