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Mixed Fine and Rare Minerals

Friday, 19 March 2021 07:00 PM

Introducing the "Mixed Fine and Rare Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including friedelite, gagarinite-(y), gratonite, jordanite, manganvesuvianite, and pyrrhotite and more from places like Franklin, Sussex Co., New Jersey, United States, Gjerdingen, Nordmarka, Lunner, Oppland, Norway, Rio Tinto mines, Huelva, Andalusia, Spain, Livingstone, Idaho, United States, N'Chwaning II mine, Kalahari Mn fields, Northern Cape Province, South Africa, and Santa Eulalia, Chihuahua, Mexico.

Friedelite

#55399
Locality
Franklin, Sussex Co., New Jersey, United States 
Formula
Mn2+8Si6O15(OH)10 
Availability
Sold
Size
3.5 x 2 x 1.5 cm - Miniature 

Lovely little crystals with triangular faces. Friedelite is a rare mineral and Franklin is probably the best.


Friedelite

Formula
Mn2+8Si6O15(OH)10 
Crystal System
Monoclinic 
Crystal Habit
Massive, Tabular 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
brown, brown red, yellow, light pink, dark red 
Streak
pink 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Uneven 
Hardness
4-5 
Collection
Arnold G Hampson Collection
SOLD
Gagarinite-(Y) - AH55362
Gagarinite-(Y) - AH55362

Gagarinite-(Y)

#AH55362
Locality
Gjerdingen, Nordmarka, Lunner, Oppland, Norway 
Formula
NaCaYF6 
Availability
Sold
Size
3 x 2 x 2 cm - Thumbnail 
Tagged
REE mineral  

One tiny little pink crystal at the arrow. Rare.


Gagarinite-(Y)

Formula
NaCaYF6 
Crystal System
Trigonal 
Crystal Habit
Massive 
Cleavage
Fair, None, None 
Luster
Vitreous - Dull 
Color
yellow, cream white, light brown, pink 
Streak
white 
Class
Trigonal - Rhombohedral 
Fracture
Brittle 
Hardness
4.5 
Collection
Arnold G Hampson Collection

Gratonite

#AH55360
Locality
Rio Tinto mines, Huelva, Andalusia, Spain 
Formula
Pb9As4S15 
Availability
Sold
Size
3 x 1.5 x 1.5 cm - Thumbnail 
Tagged
sulfide  

Long prismatic crystals to 1.5mm. These crystals are very similar to the type locality of Excelsior mine in Peru. The crystals are steel grey with trigonal terminations.


Gratonite

Formula
Pb9As4S15 
Crystal System
Trigonal 
Cleavage
None, None, None 
Luster
Metallic 
Color
lead gray, dark lead gray 
Streak
black 
Class
Trigonal - Ditrigonal Pyramidal 
Fracture
Brittle 
Hardness
2.5 
Collection
Arnold G Hampson Collection
Mineralpedia
View Gratonite
On Dakota Matrix
Previously Sold Gratonite
On Dakota Matrix
Other Available Gratonite
WebMineral
View Gratonite
Mindat
View Gratonite
SOLD
Jordanite - 55371
Jordanite - 55371

Jordanite

#55371
Locality
Livingstone, Idaho, United States 
Formula
Pb14(As,Sb)6S23 
Availability
Sold
Size
3 x 2.5 x 2 cm - Thumbnail 
Tagged
sulfide  
Special Info
XRD Confirmed 

Silvery mass with minor Galena. XRD.


Jordanite

Formula
Pb14(As,Sb)6S23 
Crystal System
Monoclinic 
Crystal Habit
Pseudo Hexagonal, Globular, Granular 
Cleavage
Distinct, None, None 
Luster
Metallic 
Color
lead gray 
Streak
black 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
Special Info
XRD Confirmed
Mineralpedia
View Jordanite
On Dakota Matrix
Previously Sold Jordanite
On Dakota Matrix
Other Available Jordanite
WebMineral
View Jordanite
Mindat
View Jordanite

Manganvesuvianite

#55373
Locality
N'Chwaning II mine, Kalahari Mn fields, Northern Cape Province, South Africa 
Formula
Ca19Mn3+Al10Mg2(SiO4)10(Si2O7)4O(OH)9 
Availability
Sold
Size
2 x 1 x 1 cm - Thumbnail 

Prismatic deep red crystals shown with backlighting. Small specimen! Ex. William Pinch.


Manganvesuvianite

Formula
Ca19Mn3+Al10Mg2(SiO4)10(Si2O7)4O(OH)9 
Crystal System
Tetragonal 
Crystal Habit
Prismatic 
Luster
Vitreous (Glassy) 
Color
deep maroon red 
Streak
white 
Class
Tetragonal - Dipyramidal 
Fracture
Brittle - Subconchoidal 
Hardness
6-7 

Pyrrhotite

with Sphalerite and Arsenopyrite - #AH55414
Locality
Santa Eulalia, Chihuahua, Mexico 
Formula
Fe7S8 
Availability
Sold
Size
6 x 4 x 3.5 cm - Sm Cabinet 
Tagged
sulfide  

Mineralogically a cool specimen. There are plates of Pyrrhotite to 1.7mm like the one at the center. To the left of that crystal are black crystals of Sphalerite to 7mm. To the right is a spray of Quartz. Now those little reticulated crystals are prismatic Arsenopyrite, which are epitaxially oriented. Also in the hood are saddle shaped Siderite crystals and Galena which can be seen on the backside, though are not crystallized but granular. 


Pyrrhotite

Formula
Fe7S8 
Crystal System
Monoclinic 
Crystal Habit
Tabular, Platy, Massive - Granular 
Cleavage
Imperfect, Imperfect, None 
Luster
Metallic 
Color
bronze, bronze red, dark brown 
Streak
gray black 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
3.5-4 
Collection
Arnold G Hampson Collection

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