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 scorodite, semseyite, siderite, stannite, stephanite, and stibiotantalite and more from places like Hemerdon Consols, Plympton, Tavistock dist., Devon, England, Knipe mine, New Cumnock, East Ayrshire, Scotland, Tincroft No. 2 lode, South Crofty, Camborne, Cornwall, England, Cligga mine, Perranzabuloe, Cornwall, England, Freiberg dist., Erzgebirge, Saxony, Germany, and Vasin-Myl'k Mt, Voron'i Tundry, Kola Peninsula, Russia.

Scorodite

#50404
Locality
Hemerdon Consols, Plympton, Tavistock dist., Devon, England 
Formula
Fe3+AsO4·2H2
Availability
Sold
Size
6.5 x 3.5 x 3 cm - Sm Cabinet 
Tagged
arsenate  

Pocket lined with exceptional blue Scorodite crystals to 2mm. The pocket is 2.5cm wide.


Scorodite

Formula
Fe3+AsO4·2H2
Crystal System
Orthorhombic 
Crystal Habit
Earthy, Granular, Fibrous 
Cleavage
Imperfect, Poor, Poor 
Luster
Vitreous - Greasy 
Color
yellowish green, pale leek green, liver brown, blue green, black green 
Streak
greenish white 
Class
Orthorhombic - Dipyramidal 
Fracture
Splintery 
Hardness
3.5-4 
Mineralpedia
View Scorodite
On Dakota Matrix
Previously Sold Scorodite
On Dakota Matrix
Other Available Scorodite
WebMineral
View Scorodite
Mindat
View Scorodite

Semseyite

with Stibnite - #50298
Locality
Knipe mine, New Cumnock, East Ayrshire, Scotland 
Formula
Pb9Sb8S21 
Availability
Sold
Size
9 x 7 x 2.5 cm - Sm Cabinet 
Tagged
sulfide  

Ain't nothing fancy about it, but it's a locality you probably didn't know. Granular Semseyite with long, embedded Stibnite crystals to 8mm. A hand-written label (prov tab) denotes the year collected: 1980


Semseyite

Formula
Pb9Sb8S21 
Crystal System
Monoclinic 
Crystal Habit
Radial, Spherical, Tabular 
Cleavage
Good, None, None 
Luster
Metallic 
Color
black, gray 
Streak
black 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
2.5 
Mineralpedia
View Semseyite
On Dakota Matrix
Previously Sold Semseyite
On Dakota Matrix
Other Available Semseyite
WebMineral
View Semseyite
Mindat
View Semseyite

Siderite

#50340
Locality
Tincroft No. 2 lode, South Crofty, Camborne, Cornwall, England 
Formula
FeCO3 
Availability
Sold
Size
10.5 x 6 x 2 cm - Cabinet 
Tagged
carbonate  

A plate of 1-2mm deep blood red Siderite crystals from this famous Cornish locality. A hand-written label shows a date of 1987, I assume this is when it was collected. (Prov. tab).


Siderite

Formula
FeCO3 
Crystal System
Trigonal 
Crystal Habit
Tabular, Massive, Botryoidal 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous (Glassy) 
Color
yellowish brown, brown, gray, yellowish gray, greenish gray 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Conchoidal 
Hardness
3.5 
Mineralpedia
View Siderite
On Dakota Matrix
Previously Sold Siderite
On Dakota Matrix
Other Available Siderite
WebMineral
View Siderite
Mindat
View Siderite

Stannite

#50344
Locality
Cligga mine, Perranzabuloe, Cornwall, England 
Formula
Cu2FeSnS4 
Availability
Sold
Size
11 x 9 x 5.5 cm - Cabinet 
Tagged
sulfide , copper , tin  

A fantastic specimen of Stannite with alterations to Azurite. The Stannite is a vein and is massive, thick (4cm) dark grey with iridescence and bordered along the host by a form of Muscovite known as "gilbertite". It was collected by J. A. Jones in 1968 from this famous Cornish locality.


Stannite

Formula
Cu2FeSnS4 
Crystal System
Tetragonal 
Crystal Habit
Massive - Granular, Crystalline - Fine 
Cleavage
Imperfect, None, None 
Luster
Metallic 
Color
blue, grayish black, steel gray 
Streak
black 
Class
Tetragonal - Scalenohedral 
Fracture
Uneven 
Hardness
3.5-4 
On Dakota Matrix
Previously Sold Stannite
On Dakota Matrix
Other Available Stannite
WebMineral
View Stannite
Mindat
View Stannite

Stephanite

#50403
Locality
Freiberg dist., Erzgebirge, Saxony, Germany 
Formula
Ag5SbS4 
Availability
Sold
Size
2.5 x 1.5 x 2 cm - Thumbnail 
Tagged
sulfide , silver  

Thumbnail specimen composed of nice, black Stephanite crystals to 3mm.


Stephanite

Formula
Ag5SbS4 
Crystal System
Orthorhombic 
Crystal Habit
Pseudo Hexagonal, Tabular, Massive 
Cleavage
Imperfect, Poor, None 
Luster
Metallic 
Color
lead gray, black 
Streak
black 
Class
Orthorhombic - Pyramidal 
Fracture
Sub Conchoidal 
Hardness
2-2.5 
SOLD
Stibiotantalite - 50495
Stibiotantalite - 50495

Stibiotantalite

#50495
Locality
Vasin-Myl'k Mt, Voron'i Tundry, Kola Peninsula, Russia 
Formula
Sb3+TaO4 
Availability
Sold
Size
5.5 x 2.5 x 2 cm - Sm Cabinet 
Special Info
XRD Confirmed 
Special Info
EDS Confirmed 

A small black grain to 2mm. Analyzed by Dr. Igor Pekov.


Stibiotantalite

Formula
Sb3+TaO4 
Crystal System
Orthorhombic 
Cleavage
Perfect, None, None 
Luster
Adamantine - Resinous 
Color
brown, greenish yellow, yellow, light yellow brown, dark brown 
Streak
light yellow 
Class
Orthorhombic - Pyramidal 
Fracture
Brittle - Conchoidal 
Hardness
5.5 
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