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, 12 November 2023 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 fibroferrite, gaudefroyite, ilmenite, libethenite, ludwigite, and mimetite and more from places like Le Cetine mine, Rosia, Siena, Tuscany, Italy, N'Chwaning II mine, Kalahari Mn fields, Northern Cape Province, South Africa, Ishpeming, Marquette Co., Michigan, United States, East Gunnislake mine, Gunnislake, Calstock, Cornwall, England, Philipsburg dist., Granite Co., Montana, United States, and San Pedro Corralitos, Chihuahua, Mexico.

Fibroferrite

#BAC62812
Locality
Le Cetine mine, Rosia, Siena, Tuscany, Italy 
Formula
Fe3+SO4(OH)·5H2
Availability
Sold
Size
6 x 2.8 x 2 cm - Sm Cabinet 

Yellow fibrous crystals throughout mass.


Fibroferrite

Formula
Fe3+SO4(OH)·5H2
Crystal System
Trigonal 
Crystal Habit
Fibrous, Radial, Massive - Fibrous 
Cleavage
Perfect, None, None 
Luster
Silky 
Color
green gray, yellow green, white, light green, light yellow 
Streak
white 
Class
Trigonal - Rhombohedral 
Fracture
Uneven 
Hardness
Collection
William & Anne Cook Collection

Gaudefroyite

#CL62751
Locality
N'Chwaning II mine, Kalahari Mn fields, Northern Cape Province, South Africa 
Formula
Ca4Mn3+3(BO3)3(CO3)(O,OH)3 
Availability
Sold
Size
4.8 x 2.3 x 1.9 cm - Miniature 

Highly lustrous, deeply striated Gaudefroyite crystals, the largest of which is 9mm.


Gaudefroyite

Formula
Ca4Mn3+3(BO3)3(CO3)(O,OH)3 
Crystal System
Hexagonal 
Crystal Habit
Prismatic 
Cleavage
None, None, None 
Luster
Adamantine - Resinous 
Color
black 
Streak
brown 
Class
Hexagonal - Pyramidal 
Fracture
Brittle - Conchoidal 
Hardness
Collection
Chet S. Lemanski, Jr. Collection

Ilmenite

with Calcite - #CL62729
Locality
Ishpeming, Marquette Co., Michigan, United States 
Formula
Fe2+Ti4+O3 
Availability
Available
Price
$45.00
Size
6 x 4.5 x 4 cm - Sm Cabinet 

For just Ilmenite, this is an attractive specimen which is loaded with plates of metallic crystals from 1 to 3cm in a light pink Calcite matrix.


Ilmenite

Formula
Fe2+Ti4+O3 
Crystal System
Trigonal 
Crystal Habit
Tabular, Massive - Lamellar 
Cleavage
None, None, None 
Luster
Sub Metallic 
Color
iron black, black 
Streak
brownish black 
Class
Trigonal - Rhombohedral 
Fracture
Conchoidal 
Hardness
5-5.5 
Collection
Chet S. Lemanski, Jr. Collection
Mineralpedia
View Ilmenite
On Dakota Matrix
Previously Sold Ilmenite
On Dakota Matrix
Other Available Ilmenite
WebMineral
View Ilmenite
Mindat
View Ilmenite

Libethenite

#CL62734
Locality
East Gunnislake mine, Gunnislake, Calstock, Cornwall, England 
Formula
Cu2PO4(OH) 
Availability
Available
Price
$35.00
Size
7 x 3.5 x 4 cm - Sm Cabinet 
Tagged
phosphate , copper  

A good representative specimen of micro Libethenite crystals from this classic Cornish locality.


Libethenite

Formula
Cu2PO4(OH) 
Crystal System
Orthorhombic 
Crystal Habit
Prismatic, Druse, Globular 
Cleavage
Indistinct, Indistinct, None 
Luster
Vitreous - Greasy 
Color
green, dark green, blackish green, light olive green, dark olive green 
Streak
light green 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle 
Hardness
Collection
Chet S. Lemanski, Jr. Collection

Ludwigite

#BW62825
Locality
Philipsburg dist., Granite Co., Montana, United States 
Formula
Mg2Fe3+O2(BO3
Availability
Sold
Size
8 x 5 x 4.5 cm - Sm Cabinet 

Shiny black interlocking grains.


Ludwigite

Formula
Mg2Fe3+O2(BO3
Crystal System
Orthorhombic 
Crystal Habit
Fibrous, Radial, Massive - Fibrous 
Cleavage
Perfect, None, None 
Luster
Silky 
Color
dark green, black, black green 
Streak
greenish black 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
5.5 
Collection
Bill Wilson Collection
Mineralpedia
View Ludwigite
On Dakota Matrix
Previously Sold Ludwigite
On Dakota Matrix
Other Available Ludwigite
WebMineral
View Ludwigite
Mindat
View Ludwigite

Mimetite

#CL62370
Locality
San Pedro Corralitos, Chihuahua, Mexico 
Formula
Pb5(AsO4)3Cl 
Availability
Available
Price
$40.00
Size
4.5 x 3 x 1.5 cm - Miniature 
Tagged
arsenate  

Excellent botryoidal bright yellow Mimetite.


Mimetite

Formula
Pb5(AsO4)3Cl 
Crystal System
Hexagonal 
Crystal Habit
Reniform, Globular, Prismatic 
Cleavage
Imperfect, None, None 
Luster
Adamantine - Resinous 
Color
white, yellow, orange, brown, red 
Streak
white 
Class
Hexagonal - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
3.5-4 
Collection
Chet S. Lemanski, Jr. Collection
Mineralpedia
View Mimetite
On Dakota Matrix
Previously Sold Mimetite
On Dakota Matrix
Other Available Mimetite
WebMineral
View Mimetite
Mindat
View Mimetite

All photos by Dakota Matrix and are Copyrighted © and may not be used without permission. Copyright © 2023 - Dakota Matrix Minerals, Inc. Privacy | Terms & Conditions | Site Map