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  

Mixed and Rare Minerals

Sunday, 11 February 2024 06:00 PM

Introducing the "Mixed and Rare Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including evenkite, fencooperite, galena, guildite, ixiolite, and jaffeite and more from places like Dubník, Červenica, Prešov Co., Prešov, Slovakia, Trumbull Peak, Mariposa Co., California, United States, Krushev dol mine, Madan ore field, Rhodope Mts, Bulgaria, United Verde mine, Jerome, Yavapai Co., Arizona, United States, Helen Beryl mine, Custer Co., South Dakota, United States, and Kombat mine, Grootfontein, Namibia.

SOLD
Evenkite - BAC63230
Evenkite - BAC63230

Evenkite

#BAC63230
Locality
Dubník, Červenica, Prešov Co., Prešov, Slovakia 
Formula
C24H48 
Availability
Sold
Size
1.7 x 1 x 0.1 cm - Thumbnail 
Special Info
Fluorescent 

Brilliantly fluorescent plate of yellowish Evenkite. Very rare worldwide. Comes with a Pequa Rare Minerals tag.


Evenkite

Formula
C24H48 
Crystal System
Orthorhombic 
Crystal Habit
Granular, Disseminated 
Cleavage
Perfect, None, None 
Luster
Waxy 
Color
colorless, yellowish green, white, yellowish white 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Hardness
Collection
William & Anne Cook Collection
Special Info
Fluorescent
Mineralpedia
View Evenkite
On Dakota Matrix
Previously Sold Evenkite
On Dakota Matrix
Other Available Evenkite
WebMineral
View Evenkite
Mindat
View Evenkite

Fencooperite

with Gillespite - #63225
Locality
Trumbull Peak, Mariposa Co., California, United States 
Formula
Ba6Fe3+3Si8O23(CO3)2Cl3·H2
Availability
Sold
Size
1.3 x 1.2 x 1 cm - Thumbnail 
Tagged
Ba Silicates , barium  
Special Info
Type Locality 

Black grains from about 0.3 to 0.8mm in Sanbornite matrix with red Gillespite. The specimen was identified by the late Gail Dunning, who was one of the authors on the new mineral in 2001 along with Andy Roberts, Grice, and Venance. The paper is located here CLICK.

Fencopperite is probably the rarest of the barium minerals at these deposits. It is a two-locality mineral found only in California.


Fencooperite

Formula
Ba6Fe3+3Si8O23(CO3)2Cl3·H2
Crystal System
Trigonal 
Crystal Habit
Aggregates, Anhedral Grains, Platy 
Luster
Vitreous - Adamantine 
Color
jet black, dirty gray brown 
Streak
grayish black 
Class
Trigonal - Ditrigonal Pyramidal 
Fracture
Conchoidal - Uneven 
Hardness
4.5-5 
Special Info
Type Locality

Galena

#AH62960
Locality
Krushev dol mine, Madan ore field, Rhodope Mts, Bulgaria 
Formula
PbS 
Availability
Available
Price
$60.00
Size
6.5 x 6 x 4 cm - Sm Cabinet 
Tagged
sulfide  

Shiny, silvery, Cubo-octahedral crystals to 1.3cm in a good large cluster.


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 
Collection
Arnold G Hampson Collection
Mineralpedia
View Galena
On Dakota Matrix
Previously Sold Galena
On Dakota Matrix
Other Available Galena
WebMineral
View Galena
Mindat
View Galena

Guildite

#BAC63260
Locality
United Verde mine, Jerome, Yavapai Co., Arizona, United States 
Formula
CuFe3+(SO4)2(OH)·4H2
Availability
Sold
Size
1.3 x 1.2 x 1.2 cm - Thumbnail 
Tagged
copper  
Special Info
Type Locality 

Yellow crystalline crusts on all sides. Guildite is a rare copper-iron sulfate occuring only at only three worldwide localities.


Guildite

Formula
CuFe3+(SO4)2(OH)·4H2
Crystal System
Monoclinic 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
brown, honey yellow, dark brown 
Streak
light yellow 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
2.5 
Collection
William & Anne Cook Collection
Special Info
Type Locality
On Dakota Matrix
Previously Sold Guildite
On Dakota Matrix
Other Available Guildite
WebMineral
View Guildite
Mindat
View Guildite
SOLD
Ixiolite - 56587
Ixiolite - 56587

Ixiolite

#56587
Locality
Helen Beryl mine, Custer Co., South Dakota, United States 
Formula
(Ta,Mn,Nb)O2 
Availability
Sold
Size
3.5 x 2.5 x 2 cm - Miniature 
Tagged
pegmatite mineral  

Dull black massive Ixiolite to 1.5cm.


Ixiolite

Formula
(Ta,Mn,Nb)O2 
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Irregular Grains 
Cleavage
Indistinct, None, None 
Luster
Metallic 
Color
gray, black, steel gray 
Streak
dark brown 
Class
Monoclinic - Prismatic 
Fracture
Conchoidal - Uneven 
Hardness
6-6.5 
On Dakota Matrix
Previously Sold Ixiolite
On Dakota Matrix
Other Available Ixiolite
WebMineral
View Ixiolite
Mindat
View Ixiolite

Jaffeite

with Defernite - #BAC63228
Locality
Kombat mine, Grootfontein, Namibia 
Formula
Ca6Si2O7(OH)6 
Availability
Sold
Size
1.8 x 1.5 x 1.2 cm - Thumbnail 
Special Info
Type Locality 

Glassy, colorless, micro to submicroscopic  Jaffeite with blades of reddish brown Defernite.


Jaffeite

Formula
Ca6Si2O7(OH)6 
Crystal System
Trigonal 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
colorless 
Streak
white 
Class
Trigonal - Rhombohedral 
Hardness
Collection
William & Anne Cook Collection
Special Info
Type Locality
On Dakota Matrix
Previously Sold Jaffeite
On Dakota Matrix
Other Available Jaffeite
WebMineral
View Jaffeite
Mindat
View Jaffeite

All photos by Dakota Matrix and are Copyrighted © and may not be used without permission. Copyright © 2024 - Dakota Matrix Minerals, Inc. Privacy | Terms & Conditions | Site Map